增容PP／回收PET共混物的力学性能

Mechanical properties of compatibilized polypropylene/recycled poly(ethylene terephthalate) blends

采用熔融挤出法制备了聚丙烯(PP)/增容剂/回收聚对苯二甲酸乙二酯(r-PET)共混物,研究了r-PET、不同增容剂和混合增容剂对PP/r-PET共混物力学性能的影响。r-PET提高了PP的拉伸强度、弯曲强度及其模量,但降低了冲击强度;采用马来酸酐接枝聚丙烯(PP-g-MAH)增容,可提高PP/r-PET共混物的拉伸强度、弯曲强度及其模量,但使冲击强度稍有降低;马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)增容或PP-g-MAH/POE-g-MAH混合增容可提高PP/r-PET共混物的冲击强度,且对共混物的拉伸和弯曲强度影响不大。

Blends of polypropylene（PP）/compatibilizers/recycled poly（ethylene terephthalate）（PET） were prepared by melt extrusion. Effects of recycled PET and different compatibilizer systems on the mechanical properties of PP/recycled PET blends were investigated. The results show that adding recycled PET increases the tensile strength and modulus, flexural strength and modulus of PP/recycled PET blends, but decreases the impact strength of the blends. The compatibilization of PP grafted by maleic anhydride（PP-g-MAH） further improves the tensile strength and modulus, flexural strength and modulus, but leads to a slight decline in the impact strength of PP/recycled PET blends. The compatibilization of ethylene-octene copolymer grafted by maleic anhydride（POE-g-MAH） or the combined use of PP-g-MAH/POE-g-MAH enhances the impact strength of PP/ recycled PET blends and have little influence on the tensile and flexural strength of the blends.