聚乳酸(PLA)是可生物降解的聚合物材料,但其韧性较差,因而应用受到限制。为改善PLA的力学性能,选用具有良好生物降解性和高柔韧性的聚丁二酸-共-对苯二甲酸丁二醇酯(PBST)与其进行共混。同时,通过添加乙撑双硬脂酰胺(EBS)作为相容剂,以优化PLA与PBST之间的相容性。研究结果表明:通过引入EBS,PLA和PBST在复合膜中的玻璃化转变温度更为接近;复合膜中海岛相结构的分散相尺寸减小,表明PLA与PBST的相容性得到改善。此外,增容改性后PLA/PBST/EBS复合膜的拉伸强度和断裂伸长率分别提高了4.67%和21.29%,水蒸气透过率下降了12.92%,复合膜的疏水性有所提高。
Polylactic acid (PLA) is a biodegradable polymer material,but its toughness is inadequate,thereby constraining its potential applications.In order to enhance the mechanical properties of PLA,this study blended PLA with poly (butylene succinate-co-terephthalate) (PBST),a polymer with good biodegradability and high flexibility.Additionally,N,N′-ethylenebis(stearamide) (EBS) was incorporated as a compatibilizer to optimize the compatibility between PLA and PBST.The results demonstrated that the introduction of EBS resulted in closer glass transition temperatures of PLA and PBST in the composite film.Furthermore,the dispersed phase size of the island structure in the composite film was reduced,indicating that the compatibility between PLA and PBST was improved.Moreover,after compatibilization modification,the tensile strength and elongation at the break of the composite film increased by 4.67% and 21.29%,respectively,and the water vapor transmission rate decreased by 12.92%.Meanwhile,the hydrophobicity of the composite film was improved.
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基金资助
山西电子科技学院人才引进科研启动基金(2023RKJ004)
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