PLLA/纳米SiO2复合材料的制备及热性能研究
首发时间:2008-11-27
摘要:为改善PLLA的耐热性能,以L-乳酸和TEOS为原料,采用原位熔融缩聚法,制备出PLLA/纳米SiO2复合材料,通过FT-IR对其结构进行表征,并用DSC研究了其热性能。结果表明,较佳制备条件为:LLA 20 g,TEOS 10 g,加入0.0020 mol SnCl2•2H2O与TSA的复合引发剂,在124 ℃下反应12 h。PLLA/纳米SiO2复合材料的Tg提高了约10 ℃,耐热性有显著改善。因此,采用原位熔融缩聚法制备PLLA/纳米SiO2复合材料是改善聚乳酸耐热性的一条新途径。
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Study on Preparation and Thermal-property of Polylactide/SiO2 composites
Abstract:In situ melt polycondensation of LLA in the presence of tetraethyl orthosilicate has been proposed as a novel approach to prepare PLLA/SiO2 composites to improve PLLA’s thermal property. The structure and thermal properties of PLLA/SiO2 composites were investigated with FT-IR and DSC. The result showed that the optimized parameters were: LLA mixing with TEOS at amass ratio 2:1, adding 0.0020mol initiator, reacting for 12 h at 124 ℃. Tg of the composite increased about 10 ℃,meaning that it have better thermal property. In situ melt polycondensation is a good way to prepare polylactide/SiO2 composite.
Keywords: Polylactic acid SiO2 nanoparticle Composites In situ melt polycondensation
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