Preparation of nano poly(phenylsilsesquioxane) spheres(nano-PPSQ) and study of the thermal stability and crystallization behavior of PPano-PPSQ composites

摘要

The preparation of nano poly(phenylsilsesquioxane) particles (nano-PPSQ) and the influence of nano-PPSQ on the thermal stability and crystallization of polypropylene (PP) were studied. The morphology and thermal stability of PPano-PPSQ composites were characterized by scanning electron microscopy (SEM) and the thermogravimetric analysis (TGA). The SEM result showed that the particles were well dispersed in the PP matrix. The TGA results of the PPano-PPSQ composites indicated that the incorporation of nano-PPSQ can improve the thermal stability of PP. The crystallization behavior and kinetics of PPano-PPSQ composite were studied by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The XRD revealed that the addition of nano-PPSQ influences the crystallinity and crystal size of PP. The Avrami, Ozawa, and combined Avrami/Ozawa (Mo method) equations were applied to describe the crystallization kinetics and estimate the kinetic parameters of mathematical models under the nonisothermal crystallization of PP and PPano-PPSQ composites. The results show that nano-PPSQ influences the crystallization temperature and rate.