微波辐照下PP/纳米TiO_2复合材料的力学性能和结晶行为  

Mechanical Properties and Crystallization Behavior of PP/Nano-TiO_2 Composites through Microwave Irradiation

作　　者：刘昌贵[1] 伍玉娇[1,2] 谢高富[1] 刘太贵[1] 何辉[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550003 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《塑料工业》2010年第8期63-66,78,共5页China Plastics Industry

基　　金：贵州省工业攻关项目[黔科合GY字(2006)3013];大学生创新性实验计划项目[贵大国创字(2009)019]

摘　　要：首先采用傅里叶红外光谱仪(FT-IR)表征了微波辐照前后PP/纳米TiO2母粒的表面特征,然后经二次熔融挤出制备了微波辐照PP/纳米TiO2复合材料。通过力学性能测试、扫描电子显微镜(SEM)观测、差式扫描量热仪(DSC)和偏光显微镜(POM)测试,对微波辐照前后PP/纳米TiO2复合材料的力学性能和结晶行为进行了研究。结果表明:微波辐照后,PP/纳米TiO2复合材料的冲击韧性、拉伸强度和弯曲模量基本保持不变,但断裂伸长率显著提高;复合材料的结晶起始温度和结晶温度明显降低,结晶速率基本不变,结晶度有所提高,晶粒尺寸变大。The surface features of PP/nano-TiO2 master batch before and after microwave irradiation were investigated by FT-IR,and then microwave irradiation PP/nano-TiO2 composites were prepared through secondary melt extrusion.The mechanical properties and crystallization behavior of PP/nano-TiO2 composites before and after microwave irradiation were studied by mechanical property tests,SEM,DSC and POM.The results showed that after microwave irradiation the impact strength,tensile strength and flexural modulus of PP/nano-TiO2 composites remained,but elongation at break increased greatly,because the tensile fracture modes changed,and their crystallization onset temperature and crystallization temperature decreased,and crystallinity increased some,while crystallization rate remained and the size of PP spherulites became bigger.

关 键 词：聚丙烯 纳米TIO2 微波辐照 力学性能 结晶行为 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]