采用等比例聚左旋乳酸(PLLA)/聚右旋乳酸(PDLA)熔融共混和注塑成型制备了立构聚乳酸(sc-PLA)和10％亚麻纤维(Flax)增强的sc-PLA复合材料,通过力学性能测试、差示扫描量热法、扫描电镜、X射线衍射、维卡软化点测试等方法对2种材料的力学性能、结晶性能、断面形貌以及耐热性能进行了比较.结果表明,制得的sc-PLA与10％Flax/sc-PLA复合材料中立构晶体与均聚物晶体并存,亚麻纤维的加入有利于提高材料的结晶度,其sc晶体生成率由66.4％提高到92.7％.与均聚物PLLA相比,sc-PLA的耐热性能虽有所增强,但力学性能还有待提高.加入了10％亚麻之后,复合材料力学性能明显改善,其拉伸强度、拉伸模量以及悬臂梁缺口冲击强度比sc-PLA分别提高了34.1％,49.8％和289.1％.此外,10％ Flax/sc-PLA复合材料还具有较好的耐热性能,其维卡软化温度达到了155.6℃,比PLLA提高近92℃.
参考文献
| [1] | Sarasua JR;Arraiza AL;Balerdi P;Maiza I .Crystallinity and mechanical properties of optically pure polylactides and their blends[J].Polymer engineering and science,2005(5):745-753. |
| [2] | Moyeenuddin A. Sawpan;Kim L Pickering;Alan Fernyhough .Improvement of mechanical performance of industrial hemp fibre reinforced polylactide biocomposites[J].Composites, Part A. Applied science and manufacturing,2011(3):310-319. |
| [3] | Scott C.Schmidt;Marc A.Hillmyer .Polylactide Stereocomplex Crystallites as Nucleating Agents for Isotactic Polylactide[J].Journal of Polymer Science, Part B. Polymer Physics,2001(3):300-313. |
| [4] | 刘涛,余雪江,余凤湄,赵秀丽,王建华.短亚麻纤维/聚乳酸复合材料制备与性能研究[J].塑料科技,2011(02):52-56. |
| [5] | H.Yamane;K.Sasai .Effect of the addition of poly(D-lactic acid) on the thermal property of poly(L-lactic acid)[J].Polymer: The International Journal for the Science and Technology of Polymers,2003(8):2569-2575. |
| [6] | Brochu S.;Barakat I.;Jerome R.;Prudhomme RE. .STEREOCOMPLEXATION AND MORPHOLOGY OF POLYLACTIDES[J].Macromolecules,1995(15):5230-5239. |
| [7] | Huijun Xu;Songchao Tang;Jianding Chen .Thermal and phase-separation behaviorof injection-molded poly(L-lactic acid)/poly(D-lactic acid) blends with moderate optical purity[J].Polymer bulletin,2012(4):1135-1151. |
| [8] | Carrasco, F;Pages, P;Gamez-Perez, J;Santana, OO;Maspoch, ML .Processing of poly(lactic acid): Characterization of chemical structure, thermal stability and mechanical properties[J].Polymer Degradation and Stability,2010(2):116-125. |
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