LDPE-g-MAH对LDPE/PVDC共混体系性能的影响

以低密度聚乙烯(LDPE)为基体材料,聚偏氯乙烯(PVDC)为共混材料,马来酸酐接枝低密度聚乙烯(LDPE-g-MAH)为相容剂,采用挤出和注塑成型方法制备LDPE/PVDC/LDPE-g-MAH共混物,考察了共混物的力学性能、阻隔性能、热性能和微观形态结构。结果表明:加入25%PVDC,LDPE/PVDC共混物的熔融温度下降了1.79℃,吸油率降低了9.66%,物理力学性能明显下降;加入LDPE-g-MAH后,LDPE和PVDC之间的界面黏结力增强,相容性提高,结晶温度和结晶度略有下降;与纯LDPE相比,含3%LDPE-g-MAH的LDPE/PVDC共混物的断裂伸长率提高了11.63%,缺口冲击强度提高了13.35%,吸油率下降了16.29%,柔韧性和阻隔性明显提高。

Effect of LDPE-g-MAH on Properties of LDPE/PVDC Blend

Taking LDPE as matrix material,PVDC as dispersed phase,LDPE-g-MAH as compatibilizer,the LDPE/PVDC/LDPE-g-MAH blend was prepared by extrusion and injection molding.The mechanical properties,barrier properties,crystallization properties and fracture surface micro-morphology of the blend were studied.The results show that the melting temperature of LDPE/PVDC blend decreased by 1.79 ℃ with the addition of 25% PVDC,the oil absorption rate decreased by 9.66%,and the mechanical properties decreased markedly.The adhesive strength between LDPE and PVDC was enhanced with the addition of LDPE-g-MAH,which improved the compatibility of the blend,besides the crystallization temperature and crystallinity decreased slightly.Compared with pure LDPE,after the addition of 3% LDPE-g-MAH,the elongation at break of the blend increased by 11.63%,the notched impact strength increased by 13.35%,the oil absorption rate decreased by 16.29%,and the flexibility and barrier properties of the blend increased obviously.