采用一(3-氨基)丙基七异丁基笼形硅氧烷(AMPOSS)与丙交酯(D,L-LA),在催化剂Sn(Oct)2作用下原位聚合,合成PLA-AMPOSS纳米杂化粒子,并应用红外光谱(FT-IR)、核磁氢谱(1H-NMR)对其进行结构表征;再将其与聚丙交酯(PLA)溶液进行共混,合成PLA/PLA-AMPOSS纳米复合材料,对复合材料的热稳定性和力学性能进行分析测试。结果表明:AMPOSS与D,L-LA发生了开环共聚,低聚丙交酯成功接枝到AMPOSS表面;复合材料的热重曲线表明PLA-AMPOSS的混入并未改变聚丙交酯树脂的降解机理,且使基体的热稳定性增强;力学性能测试结果表明,PLA-AMPOSS的引入对聚丙交酯树脂有增强增韧的作用,引入含量在10%和15%时,复合材料的拉伸强度和断裂伸长率分别最大,为34.6MPa和4.8%。
PLA-AMPOSS nano-hybrid particles were synthesized by in-situ polymerization of one (3-amino) propyl 7-isobutyl cage siloxane (AMPOSS) and lactide (D,L-LA) under the action of Sn(Oct)2,and their structures were characterized by FT-IR and 1H-NMR.Then it was mixed with polylactide (PLA) solution to synthesize PLA/PLA-AMPOSS nanocomposites,and the thermal stability and mechanical properties of the composites were analyzed and tested.FT-IR and 1H-NMR spectra showed that AMPOSS had open-loop copolymerization with D,L-LA,and oligopolyllactide was successfully grafted to the surface of AMPOSS.The TGA curve of the composite showed that the mixing of PLA-AMPOSS did not change the degradation mechanism of polylactide resin,and the thermal stability of the matrix was enhanced.The mechanical properties test results showed that the introduction of PLA-AMPOSS could enhance and toughen the polylactide resin.When the introduction content was 10% and 15%,the tensile strength and elongation at break of the composite were the largest,respectively,at 34.6MPa and 4.8%.
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