本文選題：聚乳酸 + 乙烯-丙烯酸共聚物�。� 參考：《材料科學與工藝》2016年04期

【摘要】：開發(fā)新型環(huán)保材料以替代塑料已成為解決當前環(huán)境問題的主要途徑,聚乳酸(PLA)雖然擁有良好的強度,而其較差的韌性極大地限制了其應用.針對此缺陷,本文以乙烯-丙烯酸共聚物(EAA)為增韌組分,蒸汽閃爆處理后的稻草纖維(SF)為增強組分加入PLA中,通過熔融擠出制備得到了不同原料配比的PLA/EAA/SF復合物,并通過對復合材料形態(tài)、熱性能及力學性能的表征分析了EAA和植物纖維的加入及用量對復合材料性能的影響.研究結(jié)果表明:EAA用量的增加有效提高了復合物的韌性,但其強度低且抑制了聚乳酸的結(jié)晶進而使得復合物強度大幅降低;植物纖維的加入既體現(xiàn)明顯的增強效果,又起到了連接兩相作用,有利于EAA在PLA中的均勻分散,尤其是在高EAA含量的體系中,植物纖維加入還具有增韌效果;同時,EAA的加入還有利于改善復合材料的熔體流動性.當PLA/EAA/SF質(zhì)量比為60/40/10時,復合材料沖擊強度和斷裂伸長率較純PLA提高約15%和65%,且具有良好的力學性能及加工性.
[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.
【作者單位】： 包裝新材料重點實驗室(湖南工業(yè)大學);湖南工業(yè)大學包裝與材料工程學院;正業(yè)(中山)包裝有限公司;
【基金】：國家科技支撐計劃資助項目(2014BAD02B06) 廣東省科技計劃項目(2013B090600120)
【分類號】：TB332
，

本文編號：2090597