原位聚合法制备纳米凹凸棒土/聚乳酸复合材料

Preparation of nano-attapulgite/polylactide composites by in situ polymerization

将凹凸棒土(AT)进行提纯和有机改性后,采用原位聚合法制备了OAT质量分数为1%、3%、5%的纳米凹凸棒土/聚乳酸复合材料(OAT/PLA-x)。采用红外、扫描电镜、X射线衍射等对复合材料进行了表征,SEM结果表明,凹凸棒土粒子在复合材料中实现了均匀稳定分散。复合材料的力学性能和综合热性能测试表明:OAT/PLA-3复合材料的拉伸强度、弹性模量分别比纯PLA增加98.6%和130.0%;复合材料的热稳定性明显提高。同时,复合材料的溶液降解速率也明显加快。

Organic-attapulgite （OAT） was obtained by pretreating attapulgite, then the nano-OAT/polyactide （PLA） -x（x = 1 wt%, 3 wt%, 5 wt%） composites were prepared respectively by in situ pdymerization. The composites were characterized by infrared absorption spectroscopy （IR）, scanning electronic microscope （SEM） and X-Ray diffraction （XRD）. SEM results show equably uniform dispersion and good interracial compatibility between PLA and OAT. The mechanical capability and thermal analysis （TGA ＆ DSC） of the composies were measured. Compared with the pure PLA, the tensile strength and elastic modulus of the OAT/PLA -3 are improved by 98.6 % and 130. 0% respectively. The thermal stability of composites is markedly improved. It also shows that the degradation velocity of OAT/PLA -x is obviously speeded up.