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Isothermal crystallization of polypropylene/surface modified silica nanocomposites

Abstract

In the present work, 3-methacryloxypropyltrimethoxy-silane silanized silica (SiO2-WD70) and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide immobilized silica (SiO2-WD70-DOPO) nanoparticles were prepared. Silica, SiO2-WD70 and SiO2-WD70-DOPO were incorporated into polypropylene (PP) by melt compounding. Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and polarized optical microscopy (POM) were employed to investigate the isothermal crystallization behavior of PP and PP/silica composites. The kinetic constant (k n ), and half crystallization time (t 1/2) were calculated by Avrami equation, while the surface free energy of folding was calculated by Lauritzen-Hoffman theory. The increased k n , decreased t 1/2 and the surface free energy (σ e) in the order of PP, PP/SiO2, PP/SiO2-WD70 and PP/SiO2-WD70-DOPO nanocomposites were attributed to the surface modification of silica. XRD indicated that SiO2-WD70-DOPO addition had no effect on PP crystal structure but accelerated the crystallization rate. POM determined that SiO2-WD70-DOPO addition promoted the nucleation of PP by inducing a higher nucleation density during isothermal conditions. The surface modified nanoparticle SiO2-WD70-DOPO might find possible application as a new type of inorganic nano-sized nucleation agent for PP.

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Correspondence to Quanxiao Dong or Mingshu Yang.

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Tang, H., Dong, Q., Liu, P. et al. Isothermal crystallization of polypropylene/surface modified silica nanocomposites. Sci. China Chem. 59, 1283–1290 (2016). https://doi.org/10.1007/s11426-016-0146-0

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  • DOI: https://doi.org/10.1007/s11426-016-0146-0

Keywords

  • composites
  • silica
  • DOPO
  • crystallization
  • grafting