纳米二氧化硅/POE协同增韧聚对苯二甲酸乙二醇酯及其发泡行为研究

摘要

Poly (ethylene terephthalate) (PET)/poly (ethylene-1-octene) (POE)/nano-SiO2 composites were prepared by a two-step melt blending process and then was foamed by a batch method with supercritical carbon dioxide as a foaming agent.The effects of nano-SiO2 and POE on the toughness and foaming behaviors of composites were investigated.The results indicated that the impact resistance of composites was enhanced significantly with the addition of nano-SiO2,and the impact strength increased by 150 ％ from 11.63 kJ/m2 to 29.15 kJ/m-2 when 0.3 phr of nanoSiO2 was introduced.There is a synergistic toughening effect observed between Nano-SiO2 and POE.The storage modulus and complex viscosity of composites were found to decrease with an increase of nano-SiO2 content.Moreover,the cell size of composite foams was reduced from 75.39 to 50.49μm with an increase of nano-SiO2 content from 0 to 1.0 phr,but their cell density increased from 6.67 × 107 to 9.61 × 107 cells/cm3 due to the heterogeneous nucleation effect of nano-SiO2.%通过熔融共混两步法制备了聚对苯二甲酸乙二醇酯(PET)/乙烯-辛烯共聚物(POE)/纳米二氧化硅复合材料,并以超临界二氧化碳为发泡剂,采用釜压法制备了PET发泡材料.研究了纳米二氧化硅和POE对PET韧性和发泡行为的影响.结果表明,纳米二氧化硅和POE显示出协同增韧PET效应,当纳米二氧化硅含量为0.3份时,冲击强度从11.63 kJ/m2增至29.15 kJ/m2,增幅达到150％;三元共混体系的储能模量(G')和复数黏度(矿)随着纳米二氧化硅含量的增加而逐渐减低;随着纳米二氧化硅从零增加到1.0份(质量份,下同),PET发泡材料的泡孔尺寸从75.39μm逐步减低至50.49μm,泡孔密度从6.67×107个/cm3增加到了9.61×107个/cm3,纳米二氧化硅表现出异相成核作用.