2012 Volume 24 Issue 3 Pages 102-106
To clarify the origin of rapid degradation of polypropylene (PP)-based composites with inorganic fillers, infrared microscope study was performed for PP/SiO2 composites. Thermal and photo degradations of PP were greatly enhanced around SiO2 particles, as a result of facile volatilization of stabilizer from loosely connected interfaces between the PP matrix and SiO2 particles. Organic modification of SiO2 surfaces improved the connection at the interfaces and notably suppressed the volatilization of stabilizer. Thus, the critical role of interfacial structures was reported for the first time in the degradation and stabilization of PP-based composites.