聚甲醛/纳米SiO2复合材料的力学性能、结晶行为及热稳定性研究  

Mechanical Properties, Crystallization Behavior and Thermal Stability of Polyoxymethylene/Nano-SiO2 Composites

作　　者：徐翔民[1] 张宏祥[1] 张豫徽[1] 李宾杰[2] 张予东[2] XU Xiang-min;ZHANG Hong-xiang;ZHANG Yu-hui;LI Bin-jie;ZHANG Yu-dong(College of Mechanical Engineering,Yellow River Conservancy Institute,Kaifeng 475000,China;College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475000,China)

机构地区：[1]黄河水利职业技术学院机械工程学院,河南开封475000 [2]河南大学化学化工学院,河南开封4750001

出　　处：《塑料科技》2020年第1期80-85,共6页Plastics Science and Technology

摘　　要：以改性纳米SiO2为填料,通过熔融共混工艺制备聚甲醛/纳米SiO2复合材料,对其力学性能、结晶行为及热稳定性进行了研究。结果表明:复合材料的拉伸强度和缺口冲击强度随着SiO2含量的增加呈先增大后减小的趋势,二者分别在SiO2质量分数为3%和1%时达到最大;而弹性模量的情况则有所不同,其随着SiO2含量的增加不断增大。DSC测试结果显示,纳米SiO2具有较好的形核作用,能够促进聚甲醛的结晶温度升高,但会抑制晶粒的生长,导致复合材料结晶度的降低。此外,纳米SiO2还能显著提高聚甲醛的热稳定性。与纯聚甲醛相比,复合材料的最大热分解温度在氮气和空气气氛下分别提高了约41.1℃和24.5℃。The polyoxymethylene-based composites containing modified nano-SiO2 were prepared by melt blending, and the mechanical properties, crystallization behavior and thermal stability of polyoxymethylene(POM) and its composites were investigated. The results show that with the increase of SiO2 content, the tensile strength and notch impact strength of the composites increase first and then decrease, and they reach the maximum when SiO2 mass fraction is 3% and 1%, respectively. The case of Young’s modulus is different, which increases constantly with the increase of SiO2 content. DSC measurement results indicate that nano-SiO2 has a good nucleation effect, which can promote the crystallization temperature of POM, but will inhibit the growth of grains, resulting in a decrease in the crystallinity of the composites. In addition, nano-SiO2 can significantly improve the thermal stability of POM. Compared with pure POM, the maximum thermal decomposition temperature of the composites are up by about 41.1℃ and 24.5℃ respectively, under nitrogen and air atmospheres.

关 键 词：聚甲醛 纳米SIO2 力学性能 结晶行为 热稳定性 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]