多元环氧扩链剂改性PLA/PBAT薄膜的制备与性能表征
李璐瑶1，高建峰1，徐鼐1，庞素娟2，潘莉莎3，黎坛4
1.海南大学材料科学与工程学院，海口 570228； 2.海南大学理学院，海口 570228；
3.海南大学化学工程与技术学院，海口 570228； 4.海南赛诺实业有限公司，海口 570125
Preparation and Properties of PLA/PBAT Films Modified with Multiple Epoxy Extenders
Li Luyao1, Gao Jianfeng1, Xu Nai1, Pang Sujuan2, Pan Lisha3, Li Tan4
1.School of Materials Science and Engineering,Hainan University,Haikou 570228,China; 2.School of Science,Hainan University,Haikou 570228,China; 3.School of Chemical Engineering and Technology,Hainan University,Haikou 570228,China; 4.Hainan Shiner Industrial Co.,Ltd.,Haikou 570125,China
摘要：为提高聚乳酸(PLA)薄膜的拉伸韧性 、透光率及其成型加工稳定性，将聚己二酸对苯二甲酸丁二酯(PBAT)与多元环氧扩链剂 (ADR)预混 ，得到预混物 PBAT/ADR。再使用 PBAT/ADR 对 PLA 进行熔融共混改性和吹膜成型，制备得到 PLA/PBAT/ADR 薄膜材料。采用旋转流变仪和扫描电子显微镜研究 ADR 添加量对 PLA/PBAT/ADR 共混物流变性能和微观结构的影响。通过挤出吹膜机组、熔体流动速率测试仪 、拉力试验机 、分光光度计 、差式扫描量热仪和广角 X 射线衍射仪研究 PLA/PBAT/ADR 薄膜的吹膜成型稳定性、拉伸性能 、透光率以及结晶等性能。 结果表明 ，ADR 的加入起到显著扩链增黏和反应性增容的作用，共混物的黏度和熔体强度得到较大提升，PBAT 分散相也得到显著细化。所得 PLA/PBAT/ADR (95/5/0.5)薄膜表现出良好的吹膜成型稳定性、高的断裂伸长率(461.4%)以及较好的透光性能(平均透光率为 86.6%)。
Abstract：In order to improve the tensile ductility, transmittance and processing stability of polylactide (PLA) films, PBAT/ADR mixture was obtained by pre-mixing polybutylene adipate-co-terephthalate (PBAT) with multiple epoxy extender (ADR). And then, PLA was blended with PBAT/ADR to prepare PLA/(PBAT/ADR) blend which was further used to produce blown film. Influences of ADR content on rheological properties and microstructure of PLA/PBAT/ADR blends were investigated using rotational rheometer and scanning electron microscopy. Blowing film stability, tensile properties, transmittance, and crystallization properties of PLA/PBAT/ADR films were studied using extrusion-blowing film unit, melt flow rate tester, tensile tester, spectrophotometer, differential scanning calorimeter, and wide-angle X-ray diffractometer, respectively. The results showed that the addition of ADR can significantly increase the viscosity and melt strength of the blend, couple with largely refining PBAT domains. It can be attributed to the effects of chain extension and reactive compatibilization of ADR on PLA/PBAT blending system. Taken overall, PLA/PBAT/ADR (95/5/0.5) film exhibits improved blowing film stability, high elongation at break of 461.4%, and better transmittance (average transmittance is 86.6%).
关键词：聚乳酸；薄膜；扩链；增容；增韧；透光率
Keywords：polylactide; film; chain extension; compatibilization; toughening; transmittance
基金：海南省财政科技计划资助项目(ZDYF2019013)，国家自然科学基金项目地区科学基金项目(51663010)
本文引用格式：
李璐瑶，高建峰，徐鼐，等.多元环氧扩链剂改性PLA/PBAT薄膜的制备与性能表征[J].工程塑料应用，2023，51(8)：8-14.
Li Luyao，Gao Jianfeng，Xu Nai，et al. Preparation and properties of PLA/PBAT films modified with multiple epoxy extenders[J]. Engineer‐ing Plastics Application，2023，51(8)：8-14.
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