植物纤维增强PLA-EAA复合材料的制备与性能

发布时间：2018-07-02 18:18

  本文选题：聚乳酸 + 乙烯-丙烯酸共聚物　； 参考：《材料科学与工艺》2016年04期

【摘要】：开发新型环保材料以替代塑料已成为解决当前环境问题的主要途径,聚乳酸(PLA)虽然拥有良好的强度,而其较差的韧性极大地限制了其应用.针对此缺陷,本文以乙烯-丙烯酸共聚物(EAA)为增韧组分,蒸汽闪爆处理后的稻草纤维(SF)为增强组分加入PLA中,通过熔融挤出制备得到了不同原料配比的PLA/EAA/SF复合物,并通过对复合材料形态、热性能及力学性能的表征分析了EAA和植物纤维的加入及用量对复合材料性能的影响.研究结果表明:EAA用量的增加有效提高了复合物的韧性,但其强度低且抑制了聚乳酸的结晶进而使得复合物强度大幅降低;植物纤维的加入既体现明显的增强效果,又起到了连接两相作用,有利于EAA在PLA中的均匀分散,尤其是在高EAA含量的体系中,植物纤维加入还具有增韧效果;同时,EAA的加入还有利于改善复合材料的熔体流动性.当PLA/EAA/SF质量比为60/40/10时,复合材料冲击强度和断裂伸长率较纯PLA提高约15%和65%,且具有良好的力学性能及加工性.
[Abstract]:The development of new environmentally friendly materials to replace plastics has become the main way to solve the current environmental problems. Although PLA has good strength, its poor toughness has greatly limited its application. In order to solve this problem, we prepared PLA / EAA / SF composites by melt extrusion with ethylene acrylic acid copolymer (EAA) as toughening component and straw fiber (SF) after steam flash explosion as reinforcing component in PLA. The effects of EAA and vegetable fiber addition on the properties of the composites were analyzed by means of the morphology, thermal and mechanical properties of the composites. The results show that the increase of the dosage of the content of: EAA can effectively improve the toughness of the composite, but its strength is low and the crystallization of polylactic acid is inhibited, and the strength of the complex is greatly reduced, and the addition of plant fiber can not only improve the strength of the composite, but also increase the strength of the composite. It is beneficial to the uniform dispersion of EAA in PLA, especially in the system with high EAA content, the addition of plant fiber also has toughening effect, and the addition of EAA can also improve the melt fluidity of composites. When the PLA / EAA / SF mass ratio is 60-40-10, the impact strength and elongation at break of the composites are increased by about 15% and 65% compared with the pure PLA, and the composites have good mechanical properties and processability.
【作者单位】： 包装新材料重点实验室(湖南工业大学);湖南工业大学包装与材料工程学院;正业(中山)包装有限公司;
【基金】：国家科技支撑计划资助项目(2014BAD02B06) 广东省科技计划项目(2013B090600120)
【分类号】：TB332
，

本文编号：2090597