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Grafting polyisoprene onto surfaces of kaolin by spray drying technology and modification of styrene–butadiene rubber

Abstract

In this contribution, we reported the investigation of styrene–butadiene rubber (SBR) reinforced by kaolin-graft-polyisoprene (Mkaol). First, poly(isoprene-maleic anhydride) random copolymers (PIPMA) which was used as macromolecular surface modifiers were synthesized via reversible addition-fragmentation chain transfer polymerization (RAFT). Second, the PIPMA was sprayed onto the surface of kaolin to obtain MKaol. FTIR spectroscopy indicated that the surface of MKaol was covered with a layer of PIPMA. MKaol and kaolin were simultaneously incorporated into SBR. The storage modulus (G′) of SBR/kaolin compounds at low strains was much lower than the G′ of SBR/MKaol. The curing properties showed that the vulcanization rate of the SBR/MKaol compounds was much lower than that of the SBR/kaolin. The cross-link density of SBR/kaolin was slightly higher than those of SBR/MKaol. The SEM images revealed that kaolin microdomains in the SBR/MKaol vulcanizates were much better distributed and dispersed than in the SBR/kaolin composites. Compared to filler dispersion and filler–rubber interaction of the SBR/kaolin composites, the mechanical properties (tensile strength, elongation at break, and tear strength) of the SBR/MKaol composites were significantly improved.

Graphical abstract

Poly(isoprene-maleic anhydride) random copolymers (PIPMA) which was used as macromolecular surface modifiers were synthesized via reversible addition-fragmentation chain transfer polymerization (RAFT). PIPMA was sprayed onto the surface of kaolin to obtain MKaol. The storage modulus (G′) of SBR/kaolin compounds at low strains was much lower than the G′ of SBR/MKaol compounds. The curing properties showed that the vulcanization rate of the SBR/MKaol compounds was much lower than that of the SBR/kaolin compounds. Kaolin microdomains in the SBR/MKaol vulcanizates were much better to disperse and distribute than in the SBR/kaolin composites. Compared to the SBR/kaolin composites, the mechanical properties of SBR/MKaol composites were greatly improved.

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Funding

This work was financially supported by the Natural Science Foundation of Anhui Province (1908085QB63), the Key Research and Development Project of Anhui Province (2022a05020009), the Foundation of Anhui Laboratory of Clean Catalytic Engineering (LCCE-02), and the Foundation of Anhui Polytechnic University of Xuancheng Institute of Industrial Technology (B2018-04).

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Correspondence to Yixin Xiang or Houluo Cong.

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Geng, Y., Zhao, H., Xiang, Y. et al. Grafting polyisoprene onto surfaces of kaolin by spray drying technology and modification of styrene–butadiene rubber. Colloid Polym Sci 300, 927–938 (2022). https://doi.org/10.1007/s00396-022-04966-2

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  • DOI: https://doi.org/10.1007/s00396-022-04966-2

Keywords

  • SBR
  • Kaolin
  • Random copolymer
  • Composites
  • Mechanical properties