SN Applied Sciences

, 1:345 | Cite as

The remarkably improved filler dispersion and performance of SSBR/BR by core–shell structure SiO2@LDH nanocomposites

  • Hong ZhuEmail author
  • Xidai Huang
  • Zhongying Wang
  • Linghan Kong
  • Minglin Chen
  • Fanghui WangEmail author
Research Article
Part of the following topical collections:
  1. 4. Materials (general)


Core–shell structure of SiO2@MgAl-layered double hydroxide (SiO2@LDH) as a novel filler was prepared and incorporated into solution-polymerized styrene butadiene rubber/butadiene rubber (SSBR/BR) matrix to prepare SiO2@LDH–SSBR/BR composites. The results revealed the advanced structure of SiO2@LDH in the application of elastomer and the strongly interaction between SiO2 and LDH. The investigation of the fracture surface scanning and the study of ‘Payne effect’ to the SSBR/BR compounds indicated a good dispersity of filler in the rubber matrix. In addition, the SiO2@LDH–SSBR/BR composites showed an increased modulus (300% strain) and a decreased modulus (100% strain) compared with commercialized Zeosil 1165MP highly-dispersed SiO2 nanoparticles. The synergistic enhancement of SiO2 and LDH in rubber matrix was discussed. The remarkable comprehensive properties enhancement of all the SiO2@LDH–SSBR/BR was obviously observed in the dynamic mechanical analysis compared with the SiO2–SSBR/BR samples. The results in this study strongly illustrate that SiO2@LDH nanocomposites could be a good candidate as a kind of reinforcement filler for the green tires.


Core–shell SiO2@LDH nanocomposites Rubber composites Green tires Dispersity improved 

1 Introduction

Rubber materials have been widely used in the automobile tire industry for their unique elasticity. To improve the performance of rubber materials, the main strategy in the elastic field is to filling the rubber matrix with nanoparticles [1, 2, 3, 4, 5]. In the past decades, carbon black as an effective reinforcing filler has been extensively applied in the tire. The performance of the rubber matrix has been remarkably enhanced by the incorporation of carbon black, especially the mechanical properties and wear resistance [6, 7, 8]. However, with the gradual depletion of the petroleum resources and the awareness of the public environmental protection, it is urgent to develop a new material to replace the oil-depended carbon black. The concept of ‘green tire’ was derived from the environmental friendly low-cost preparation and outstanding reinforcement of rubber matrix. Silica nanoparticles (SiO2), considered as an excellent substitute for carbon black, has attracted the worldwide attention in the tire industry [9, 10, 11, 12, 13, 14]. The rubber tread were endowed with the reinforced mechanical properties as well as the improved wet skid resistance and decreased rolling resistance by filling with SiO2 nanoparticles composites. Considering the close correlation between the properties of tires and the safety of automobile travelling as well as the fuel consumption, the using of SiO2 nanoparticles becomes a core research [11, 15, 16, 17, 18]. Nevertheless, due to the nano level particle size and a mass of hydrophilic groups on the surface, the aggregation of SiO2 nanoparticles is inevitable after filling in the rubber matrix which lead to the decline of comprehensive properties [19, 20]. The enhancement of the comprehensive performance of rubber composites, especially the improvement of the dispersity of SiO2 nanoparticles in the matrix has become the focus of recent researches.

Layered double hydroxides (LDHs), owing to the flexible adjustability and alternation of the bivalent and trivalent metal ions on the layers has become a kind of conspicuous two dimensional materials [21, 22, 23, 24, 25, 26]. In the past few years, a number of reports on LDH-based rubber composites revealed the application potential of LDH in the elastomer. As previously reported, the rubber matrix was reinforced in mechanical properties and functionalized with other performance, such as vulcanization, optical properties, flame retardant and environmental friendliness [27, 28, 29, 30, 31]. However, LDH is rarely reported for the application in fabricating green tire tread composites. In recent years, endowing a tire with high wet skid resistance and low rolling resistance has become a crux to the manufacture of ‘green tire’ [32, 33]. It is still a problem for tire rubber composites to obtain both the high wet skid resistance and the low rolling resistance.

In our previous study, we have assembled the SiO2 nanodots with MgAl-LDH [34]. Although the SiO2 nanodots with minimal size and the advanced performance were obtained, the fussy preparation and the difficulty in the quantitative control of SiO2 nanodots has restricted its further application. Here, the LDH nanosheets were in situ grown on the surface of the pre-prepared SiO2 nanoparticles to obtain SiO2@LDH nanocomposites and further incorporated into SSBR/BR rubber matrix to fabricate SiO2@LDH–SSBR/BR composites (Scheme 1). A group of SiO2@LDH nanocomposites with different ratio of SiO2 and LDH were obtained with the same preparation process for further study of the optimal SiO2/LDH ratio. In addition, the synergistic effect of two materials distinctly improved the dispersity of fillers and enhanced the comprehensive performance of SSBR/BR matrix. This research opened up a new application of SiO2@LDH nanocomposites.
Scheme 1

Schematic preparation diagram of SiO2@LDH and the fabrication of SSBR/BR composites

2 Experimental section

2.1 Materials

Mg(NO3)2·6H2O and Al(NO3)3·9H2O were obtained from Beijing Chemical Works Co., Ltd. Na2CO3 and NaOH were produced by Beijing Chemical Works. The sodium silicate (Na2O·3.2SiO2, 27 wt%) that used for the preparation of silica in this work was manufactured by Beijing Linhengtai Trade Co., Ltd.. Sulphuric acid and citric acid were obtained from Shanghai Macklin Biochemical Co., Ltd.. SSBR (Buna VSL 5025-2HM, oil-extended) and BR (CB24) were purchased from Lanxess Chemical Industry Co., Ltd. (Germany). Commercial Zeosil 1165MP highly-dispersed nano-SiO2 was purchased from Rhodia France (Qingdao, China). Bis(3-triethoxysilylpropyl)tetrasulfide (Si69) was produced by Nanjing Shuguang Chemical Group Co., Ltd.

2.2 Preparation of SiO2 nanoparticles

Typically, sodium silicate was mixed with a certain of deionized water (v/v = 1:3) and the mixture was heated to 80 °C. Ethanol was added into sodium silicate solution for the nucleation of SiO2 nanoparticles. After being uniformly stirred, 7 mL citric acid (2.3 mol/L) was added into the sodium silicate solution. 2.5 mol/L H2SO4 solution was used to adjust the pH around 6. The silica mixture was aged for 6 h in ethanol. The SiO2 mixture was washed by deionized water and dried at 60 °C overnight, then the pure SiO2 nanoparticles was obtained. For comparison, the representative and outstanding commercialized Zeosil 1165MP highly-dispersed nano-SiO2 was used in this study. According to our previous research, the SiO2 nanoparticles prepared in Sect. 2.2 showed the similar mechanical properties and dispersity with the commercialized Zeosil 1165 MP in SSBR/BR, but the different dynamic mechanical properties [14, 34]. And the dynamic mechanical properties of SSBR/BR filled with two kinds of SiO2 were studied particularly in Sect. 3.5 to highlight the performance of the SiO2@LDH nanocomposites.

2.3 Preparation of SiO2@LDH nanocomposites

Typically, 0.05 g SiO2 nanoparticles that prepared in Sect. 2.2 was mixed with 20 mL deionized water, and then sonicated for 1 h. 0.1 g Na2CO3 was dissolved into the SiO2 dispersion, forming solution A. 0.25 g Mg(NO3)2·6H2O and 0.18 g Al(NO3)3·9H2O were dissolved to form solution B. Then B was added slowly into A under a strong stirring. The pH of suspension was kept at 11 using 1 M NaOH, and uniformly stirred at room temperature. The mixture was washed 3 times with deionized water and ethanol respectively, and dried at 60 °C for 36 h to obtain SiO2@LDH nanocomposites.

2.4 Preparation of SSBR/BR composites

Table 1 shows the mixing recipes of the SSBR/BR compounds. The method of the preparation of SSBR/BR composites refers to the previous studies of our group [14, 34].
Table 1

The compound formulation


Loading (phr)







Stearic acid


SiO2@LDH (Zeosil 1165MP)



10 wt% of filler

Accelerator Da


Accelerator CZb


Antioxidant 4010NAc


Paraffin wax




Unit: Parts per hundred rubber, phr

aAccelerator D is 1,3-diphenylguanidine

bAccelerator CZ is N-cyclohexyl-2-beozothiazole sulfonamide

cAntioxidant 4010NA is N-isopropyl-N′-phenyl-1,4-phenylenediamin

2.5 Characterization

The morphologies of the nanocomposites were observed by a JEM-2100 transmission electron microscope (TEM). The fracture surface of the rubber composites was observed by an S-4800 scanning electron microscope (SEM). The crystalline structures of the nano materials samples were detected by an X-ray diffractometer (XD-3A, Japan). The surface elemental compositions of LDH, SiO2 and SiO2@LDH were measured by an X-ray photoelectron spectroscope (XPS) (Thermo Fisher LAB 250 ESCA System, USA).

The optimum vulcanized time (t90) of the SSBR/BR composites was obtained using the MR-C3 moving-die rheometer (MDR) at 150 °C. The mechanical properties of vulcanizates were confirmed by a CTM4104 tensile tester (SANS, China). The dynamic rheological properties of the composites were measured by RPA2000 (Alpha Technologies Co., USA) at 60 °C and the strain amplitude was varied from 0.28 to 400% at the frequency of 1 Hz. Dynamic mechanical properties of the vulcanizates were tested by dynamic mechanical analysis (DMA) (VA3000, 01 dB-Metravib Co., Ltd., France). Test were set from − 80 to 80 °C under the condition of 3 Hz, and temperature rate was set as 3 °C/min.

3 Results and discussion

3.1 Morphology and structure

The TEM images displayed the morphology of prepared SiO2 nanoparticles and SiO2@LDH nanocomposites. In Fig. 1a, the particle size of prepared SiO2 nanoparticles in Sect. 2.2 is about 15 nm on average. For SiO2@LDH nanocomposites (Fig. 1b), the surfaces of SiO2 nanoparticles are covered by a large quantity of sheet-like LDH and the particle size of SiO2@LDH nanocomposites is about 40 nm (Fig. 1c). In addition, the isolated SiO2 nanoparticles are hardly observed in the TEM image, indicating the high integration of the SiO2@LDH nanocomposites. The dispersion state of the SiO2@LDH nanocomposites were observed by SEM (Fig. 1d, e). The SiO2@LDH nanocomposites are uniformly dispersed in the rubber matrix. Meanwhile, the sheet-like LDH can be observed in the fracture surface, suggesting that the gear-shaped SiO2@LDH nanocomposites effectively prevent the rubber matrix from disrupting and the mechanical properties of rubber composites are reinforced.
Fig. 1

TEM image of the prepared SiO2 nanoparticles (a) and SiO2@LDH nanocomposites with mass ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/2 (b); Magnification of SiO2@LDH nanocomposites (c); SEM images of the fracture surfaces of the vulcanizates with different mass ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/2 (d) and 5/3 (e)

3.2 Chemical structure of characterization

The crystal structure of SiO2 nanoparticles, LDH and different mass ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) of SiO2@LDH are confirmed by the powder XRD. As shown in Fig. 2, the characterized diffraction of SiO2 nanoparticles is presented at 22°, indicating the common amorphous structure of SiO2 nanoparticles. For LDH, the characterized diffraction of (003), (006), (009), (015), (018), (110), and (113) appeared [35]. After the precipitation of LDH on the SiO2 nanoparticles, the relative characterized diffraction occurred, indicating the combination of SiO2 nanoparticles and LDH. Moreover, the intensity of the LDH peaks raised while the content of Mg2+ increased. Compared with LDH, the broadened diffractions of SiO2@LDH are shown at the same 2θ positions, indicating that the LDH species is maintained in SiO2@LDH [36]. Because the LDH species is diluted by SiO2, the intensity of LDH species in SiO2@LDH declined due to the combination of SiO2 nanoparticles and LDH [34].
Fig. 2

XRD patterns of SiO2, LDH and SiO2@LDH with different mass ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\)

In order to investigate the interaction between SiO2 nanoparticles and LDH nanosheets, the XPS of the sample was analyzed. The Mg 1s, O 1s, C 1s, Al 2p, Si 2s and Si 2p peaks are obviously shown in Fig. 3a, indicating the presence of Mg, Al, O, C and Si in the SiO2@LDH nanocomposites. As shown in Fig. 3b, magnification of Si 2p electronic orbit spectrum can be deconvoluted into two kinds of Si4+ species fitting peaks: the SiO2 and [SiO4] tetrahedron [34, 37]. The presence of [SiO4] tetrahedron proves the formation of new bonds between SiO2 and LDH which could further confirms the hybridized structure within the SiO2@LDH and the interaction between SiO2 and LDH.
Fig. 3

XPS spectra: a survey spectra of SiO2, LDH and SiO2@LDH; b Si 2p spectra of SiO2@LDH nanocomposites

3.3 Dynamic rheological properties

Obviously, for each sample, the value of G′ decreased dramatically as shown in Fig. 4 because of the well-known ‘Payne effect’ [38, 39]. When the compounds are deformed by external stress, the filler–filler interaction and the value of G′ decrease gradually with the increasing of strain amplitude. Compared with SiO2 nanoparticles, LDH shows a remarkable decreasing of G′ during the strain amplitude, indicating that the LDH forms a weaker filler network structure [35]. Notably, there are several new trends of G′ value are observed after filling with SiO2@LDH. At the ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/1, the G′ value of SSBR/BR compound is dramatically decreased and almost closed to LDH–SSBR/BR, indicating that LDH acts as an important role in reducing the formation of filler network structure. With the increase of LDH content, the G′ values are decreased even lower than LDH–SSBR/BR at the ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/3. This phenomenon can be explained by the morphology of the SiO2@LDH nanocomposites. In SiO2@LDH nanocomposites, the sheet-like LDH is grown vertically on the surface of SiO2 nanoparticles, creating an initiative insulation from each other as observed in the TEM images. Furthermore, the sheet-like LDH shows weaker filler network structure compared with solely spherical SiO2 nanoparticles, indicating the further decreasing of G′ values. With a further increasing of LDH content, the increscent size and the increasing number of LDH lead to the stack of LDH nanosheets and complicated filler network structure. Although the initial G′ values of SiO2@LDH–SSBR/BR show an increasing trend, the initial G′ values are still at a relatively low level compared with SiO2, indicating the combination of SiO2 nanoparticles and LDH leads to the attenuation of the filler network structure.
Fig. 4

Dependence of G′ of the LDH, SiO2 and SiO2@LDH on strain with different mass ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\)

3.4 Mechanical properties

SiO2@LDH nanocomposites act as an important role to the mechanical properties of SSBR/BR composites. At 100% strain, the filler network structure has not been destroyed, the stress is mainly contributed by the filler network structure and the interaction of fillers. While increasing to 300% strain, the filler–rubber interaction mainly contributes to the stress since the filler network structure collapsed. In Fig. 5a, compared with SiO2–SSBR/BR, the tensile modulus (300% strain) of SiO2@LDH–SSBR/BR along with tensile strength increased, but the tensile modulus (100% strain) obviously decreased with the \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) ratio below 5/4. The decreasing of stress at 100% strain at low ratio of LDH further proved the increasing degree of dispersion after the assembly of SiO2 and LDH. In addition, the raising of stress at 300% strain indicated that the increasing of chemical action between SiO2@LDH and rubber matrix. Compared with SiO2 nanoparticles, the SiO2@LDH nanocomposites are more likely to react with Si69 due to the increasing number of reactive sites. The enhancement of elongation at break with the ration of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/1 is owing to the slippage of rubber chains on the oriented LDH layers [40]. At high content of LDH, although the number of reactive sites for single nanoparticle increased, the dramatically enlargement of particle size and the decline of dispersion of SiO2@LDH nanocomposites dominate the decreasing of tensile strength.
Fig. 5

a The true stress–strain curves of SiO2@LDH–SSBR/BR composites; b the true stress–strain curves of SSBR/BR composites filled with different fillers

In Fig. 5b, the LDH and SiO2 nanoparticles show conspicuous enhancement in the elongation at break and the tensile strength. The SiO2@LDH shows the obvious synergistic effect in the reinforcement of rubber matrix because of the improving of dispersion and the increasing number of reactive sites. The aforementioned results clearly reveal that the mechanical properties is significantly enhanced by SiO2@LDH.

3.5 Dynamic mechanical analysis

Dynamic mechanical analysis was used to further investigate the interaction between SiO2@LDH nanocomposites and SSRB/BR matrix. Figure 6a, b show that the values of storage modulus (G′) dramatically decreased because of the energy dissipation during the glass–rubber transition of SSBR/BR as temperatures rise [41]. The values of G′ is highly related to the dispersity of fillers and filler–rubber interaction [42, 43]. Obviously, with the increasing content of LDH at low temperature range, the G′ values of SiO2@LDH–SSBR/BR decrease at first and then raise. Below glass-transition temperature, the values of G′ are mostly contributed by filler–filler interaction due to the restriction of rubber chains [13]. So the decreasing of G′ indicating the decline of SiO2@LDH network structure at low LDH content. At \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/5, the increasing size and stack of LDH nanosheets mainly contribute the raise of G′. At high temperature range, with the increasing ratio of LDH, a more evident trend is observed at high temperature range, indicating the improved dispersity and enhanced filler–rubber interaction.
Fig. 6

a Dependence of storage modulus (G′) of different SSBR/BR composites on temperature; b enlargement of a at low and high temperature range; c dependence of tan δ of different SSBR/BR composites on temperature; d enlargement of c near 0 °C and 60 °C

Figure 6c, d show the dependence of tan δ of vulcanized rubber on different temperature. In Fig. 6c, the prepared SiO2–SSBR/BR composites shows a higher value of tan δ than Zeosil 1165MP–SSBR/BR. Compared with two types of SiO2–SSBR/BR composites, there are higher values of tan δ of the SiO2@LDH–SSBR/BR composites with different ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\). In the glass–rubber transition of SSBR/BR composites, the restriction of the movement of rubber chains is determined by the dispersion degree of fillers in rubber matrix and the energy dissipation is mostly caused by the friction between rubber chains. As a result, the improved dispersion of fillers in rubber matrix leading to an increased value of tan δ [44]. In addition, the effective volume of rubber chains also increased with the improving of fillers dispersion, leading to the rising number of unrestricted rubber chains and a high value of tan δ [45]. The results above suggest that the SiO2@LDH nanocomposites possess a better degree of dispersion than SiO2 nanoparticles.

Figure 6d is the magnified region of Fig. 6c near the temperature of 0 °C and 60 °C. As shown in Fig. 6d, compared with both types of SiO2 in this experiment, all the SiO2@LDH–SSBR/BR composites show higher tan δ values at 0 °C and lower tan δ values at 60 °C, indicating the enhanced wet skid resistance and decreased rolling resistance [7, 13, 46]. The vertically grown LDH nanosheets on the SiO2 nanoparticle forms a hackly surface, and the interface of rubber-water can be easily broken. The tire is in firmly contacted with ground and provided high friction coefficient with the special serrated structure of the bare SiO2@LDH nanocomposites. In addition, the hydrophilic group on the LDH accelerate a breaking of the rubber-water interface resulting to the enhancement of wet skid resistance. Tan δ value is depended on the collapse and reformation of the filler network structure at 60 °C [44, 47]. As discussed above, the SiO2@LDH nanocomposites show high degree of dispersion in the elastomer, the friction between fillers decreased during cyclic deformation leading a decreasing of tan δ. Notably, although the more developed filler network structure is formed at the ratio of \({{M_{{{\text{SiO}}_{2} }} } \mathord{\left/ {\vphantom {{M_{{{\text{SiO}}_{2} }} } {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}} \right. \kern-0pt} {M_{{{\text{Mg}}(N{\text{O}}_{3} )_{2} \cdot6{\text{H}}_{2} {\text{O}}}} }}\) = 5/4 and 5/5, the values of tan δ are still lower than the SiO2–SSBR/BR composites. The mobility and rotation of LDH are restricted due to the separation of SiO2 nanoparticles, thus restrain the reformation of the filler network structure. We conclude that the comprehensive performance of SSBR/BR composites are effectively improved by SiO2@LDH.

4 Conclusion

In this work, SiO2@LDH nanocomposites were prepared by chemical assembly. The as prepared SiO2@LDH were used in designing SSBR/BR compounds. The properties of SiO2@LDH–SSBR/BR composites were studied. The characterizations of the SiO2@LDH nanocomposites structures show a strong interaction between SiO2 and LDH and the synergistic reinforcement effect in the SSBR/BR matrix. The investigation of the SiO2@LDH–SSBR/BR properties reveals the improved dispersity of SiO2@LDH and the reinforced filler–rubber interaction. The enhanced comprehensive performance of SSBR/BR matrix is obtained through the incorporation of SiO2@LDH nanocomposites indicating a potential application in the green tires. This work may open up new opportunities to the development of SiO2-based fillers for high-performance elastomer application.



This work is supported by the National Basic Research Program of China (Grant Nos. 2015CB654700 and 2015CB654703), the National Natural Science Foundation of China (Nos. 21476020, 21776012 and 21776014), and the Joint Funds of the National Natural Science Foundation of China (No. U1705253).

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no competing financial interest.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Chemical Resource Engineering, School of ScienceBeijing University of Chemical TechnologyBeijingPeople’s Republic of China

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