Fabrication Of Recycled-PET Reinforced PP And Its Properties

In this study, Recycled PET reinforced PP was prepared by using PP as the matrix, during which recycled PET was used as the dispersed phase, and PP-g-GMA and POE-gGMA as the compatibilizer, by using a normal twin-extrusion and in-situ microfibrillated technology(slit-extrusion-hot stretching-quenching). The morphology of the resultant composite was investigated by SEM(Scanning Electron Microscopy). Compatilizer effect was analysied by using FT-IR(Fourier Transform Infrared Spectrometer). The mechanical and thermal properties were measured by using mechnial and thermal tester. The results show: compatibilizer(PP-g-GMA and POE-g-GMA) can significantly improve the interface interaction between PP matrix and R-PET dispersion phase, improving the compatibility of the two components, from the originally thermodynamical incompatible system to thermodynamically compatible system. With the content increase of compatibilizer(PP-g-GMA), the properties of the tensile strength, flexural strength of PP/ R-PET blends, tensile modulus and flexural modulus increased significantly. When the content of the compatibilizer exceeds 5%, the performance was observed decrease. Meanwhile, with the compatibilizer(PP-g-GMA) content increase, the notched impact strength and thermal deformation temperature of PP/R-PET blend decreased. When the compatibilizer(PP-g-GMA) content reaches 5%, the comprehensive properties of PP/RPET blend are the best, and the performance is almost the same as the PP system with pure PET as the enhancement. It is reasonable to conclude that R-PET can replace part of the pure PET, for the commercial production. Compatibilizer(POE-g-GMA) can significantly increase the notched impact strength of PP/R-PET copolymer without destroy the tensile strength and flexural strength; In situ microfibrillar(melt extrusion heat stretching quenching) processing method can significantly improve the strength, modulus and impact strength of PP/R-PET blend.