The Studies on Crystallization of Polypropylene (PP)/Nano-TiO2 Composites under Microwave Irradiation

Chang Gui Liu; Yu Jiao Wu; Chun Ping Yang

doi:10.4028/www.scientific.net/AMR.690-693.1609

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The Studies on Crystallization of Polypropylene (PP)/Nano-TiO₂ Composites under Microwave Irradiation

Abstract:

The surface-features of PP/nano-TiO₂ masterbatch before and after microwave irradiation were investigated by FT-IR, and then PP/nano-TiO₂ composites were prepared through secondary melt extrusion. The mechanical properties and crystallization behaviors of PP/nano-TiO2 composites before and after microwave irradiation were studied by mechanical property tests, Scanning Electron Microscope (SEM), differential scanning calorimetry (DSC) and polar optical microscope (POM). The results showed that impact strength, tensile strength and flexural modulus of PP/nano-TiO2 composites were remained, but elongation at break increased by 100% after microwave irradiation because their tensile fracture modes changed, and their crystallization onset temperature and crystallization temperature decreased respectively by 2.26°C and 2.23°C but crystallinity increased by 20%, while crystallization rate remained and the size of PP spherulites became bigger obviously.