PP/纳米Al_2O_3复合材料及其发泡材料的制备与表征  

Preparation and Characterization of PP/Nano Al_2O_3 Composites and Its Foams

作　　者：刘伟[1] 张纯[1] 雷泽明 伍玉娇[1] 杨柳涛[1] Liu Wei;Zhang Chun;Lei Zeming;Wu Yujiao;Yang Liutao(School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550003, China)

机构地区：[1]贵州理工学院材料与冶金工程学院,贵阳550003

出　　处：《工程塑料应用》2016年第7期25-30,共6页Engineering Plastics Application

基　　金：贵州省科技厅联合基金项目(黔科合LH字[2014]7372号);高层次人才科研启动基金项目(XJGC20141103)

摘　　要：用PP与纳米Al_2O_3熔融共混法制备复合材料,再用超临界CO_2间歇发泡法制备发泡材料,并对材料的结晶行为、力学性能、发泡行为和导热性能进行研究。结果表明,纳米Al_2O_3能提高复合材料的结晶和熔融温度,但会降低PP链段运动能力,当纳米Al_2O_3含量为7%时,复合材料的结晶度由纯PP的28.10%降至24.46%;纳米Al_2O_3具有刚性粒子的增强增韧协同效果,当纳米Al_2O_3含量为5%时,纳米Al_2O_3的骨架效应使得复合材料的拉伸强度达到33.9 MPa,继续提高其含量后复合材料的拉伸强度略微下降。由于纳米Al_2O_3的刚性粒子增韧效果,当纳米Al_2O_3含量达到7%时,复合材料的冲击强度可达到5.26 k J/m2。纳米Al_2O_3起到异相泡孔成核剂作用,加入5%的纳米Al_2O_3后,发泡材料的泡孔密度提高至2.18×107个/cm3,其热导率在纳米Al_2O_3含量为7%时达到0.107 W/(m·K)。Polypropylene (PP)/nano Al2O3 composites were prepared by melt mixing,then the composites were foamed bybatch-foaming method using supercritical CO2 as blowing agent. The crystallization behaviors and mechanical properties of the compositesas well as the thermal conductivities and foaming behaviors of the foams were studied. The results show that the crystallizationtemperature and melt temperature of the composites increase with the inducing of nano Al2O3,when nano Al2O3 content is 7%,the crystallinity decreases from 28.10% to 24.46% due to the decreasing chain mobility of PP. The tensile and impact strength of thecomposites are enhanced by adding nano Al2O3,the tensile strength reaches 33.9 MPa when nano Al2O3content is 5%,the impactstrength reaches 5.26 kJ/m2 when nano Al2O3 content is 7%. The cellular morphology and thermal conductivity of PP/nano Al2O3foams are improved by adding nano Al2O3. When nano Al2O3 content is 5%,the foam’s cell density can reach 2.18×107 cell/cm3,and thermal conductivity increases to 0.107 W/(m · K) with addition of 7% nano Al2O3.

关 键 词：聚丙烯 纳米氧化铝 发泡材料 热导率 力学性能 结晶行为 

分 类 号：TQ328[化学工程—合成树脂塑料工业]