聚乳酸聚氨酯嵌段预聚体增韧PLA/TPU共混物  

Study on polylactic acid polyurethane block prepolymer toughened PLA/TPU blends

作　　者：朱海彬 朱涛[1] 张卫英[1] 英晓光[1] 李晓[1,2] ZHU Haibin;ZHU Tao;ZHANC Weiying;YING Xiaoguang;LI Xiao(College of Chemical Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学化工学院,福建福州350108 [2]福建省植物资源高值化利用工程技术研究中心,福建福州350108

出　　处：《福州大学学报（自然科学版）》2024年第3期268-275,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(22278084);福建省自然科学基金资助项目(2020J01514)。

摘　　要：合成聚乳酸聚氨酯嵌段共聚物预聚体(PLA-b-PUP),以其作为聚乳酸(PLA)和热塑性聚氨酯(TPU)的活性相容剂,通过原位反应增容制备PLA/TPU/PLA-b-PUP超韧共混物.通过拉伸试验、冲击试验、SEM、FTIR、DSC和TGA研究共混物的力学性能、热性能和增韧机理.结果表明,PLA-b-PUP中的异氰酸酯基团与PLA和TPU上的活性基团发生反应,显著改善了PLA/TPU共混物两相界面的相容性.随着PLA-b-PUP的加入量增加,共混物中PLA的玻璃化转变温度和相对结晶度逐渐降低,当PLA-b-PUP的质量分数为PLA/TPU共混物的4%时,共混材料的断裂伸长率和缺口冲击强度分别达到无相容剂时的8.12和2.73倍,表现出良好的增容增韧效果.添加PLA-b-PUP后,共混物的初始分解温度有所降低,但最快分解温度有所提高.In this study,polylactic polyurethane block prepolymer(PLA-b-PUP)was synthesized and used as the active compatibilizer of polylactic acid(PLA)and thermoplastic polyurethane(TPU).PLA/TPU/PLA-b-PUP supertoughened-blends were prepared by in-situ reaction.The mechanical properties,thermal properties and toughening mechanism of the blends were investigated by tensile test,impact test,SEM,FTIR,DSC and TGA.The results showed that the isocyanate groups in the PLA-b-PUP reacted with the active groups on PLA and TPU,which significantly improved the compatibility of the two-phase interface of PLA/TPU blends.With the addition of PLA-b-PUP,the glass transition temperature and relative crystallinity of PLA in the blend gradually decreased.When the mass fraction of PLA-b-PUP was 4%of that of PLA/TPU blend,the elongation at break and notch impact strength of the blend were 8.12 and 2.73 times of those without compatilizer,respectively,showing a good capacity and toughening effect.After addition of PLA-b-PUP,the initial decomposition temperature decreased,but the fastest decomposition temperature increased.

关 键 词：PLA/TPU/PLA-b-PUB共混物 聚乳酸聚氨酯嵌段预聚体 原位反应 聚乳酸 热塑性聚氨酯 增容机制 增韧机理 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]