羟基功能化离聚物与含环氧基团增容剂协同改性聚乳酸  

Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives

作　　者：马轶莲 胡浩东 丁营利 陈相见 崔亮[3] 张坤玉 MA Yi-Lian;HU Hao-Dong;DING Ying-Li;CHEN Xiang-Jian;CUI Liang;ZHANG Kun-Yu(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Composite and Functional Materials,School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Advanced Materials Research Center,Petrochemical Research Institute,Petro China Company Limited,Beijing 102206,China)

机构地区：[1]天津大学化工学院,天津300350 [2]天津大学材料科学与工程学院,天津市材料复合与功能化重点实验室,天津300350 [3]中国石油天然气股份有限公司石油化工研究院,北京102299

出　　处：《应用化学》2022年第12期1870-1879,共10页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(No.51573130)资助。

摘　　要：针对聚乳酸脆性严重的问题,以羟基功能化离聚物作为增韧剂,与含环氧基团助剂增容剂协同配合,采用熔融反应共混的方法,制备高韧性聚乳酸(PLA)基多元共混材料。通过扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、差示扫描量热仪(DSC)和力学性能测试等手段对共混体系的结构与性能进行了深入表征分析,比较了环氧大豆油(ESO)、聚乙二醇二缩水甘油醚(PEGDE)和乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(AX8900)三元共聚物的协同增容增韧效果。结果表明,增容效果与助剂环氧基团含量和位置密切相关,通过调控环氧基团的含量和位置而呈现不同的增韧改性效果:适量AX8900的加入可有效改善共混体系的韧性,有利于获得均衡的力学性能,最优冲击密度高于12 kJ/m^(2),拉伸强度在40 MPa以上。而ESO容易导致交联发生,从而限制了增韧效率;PEGDE因增容效果较差主要呈现增塑作用,导致拉伸强度降低。研究结果揭示了不同环氧助剂与含羟基聚合物协同改性PLA共混体系的内在机理,为开发高性能生物基PLA材料提供了参考指导。Aiming to tackle the serious brittleness problem of polylactic acid(PLA),PLA-based multiphase blends are prepared by melting reactive blending with hydroxyl functionalized ionomer as the toughening agent and compatibilizer containing epoxy groups. The structures and properties of the blends are characterized by scanning electron microscopy(SEM),Fourier transform infrared spectrometer(FT-IR),differential scanning calorimetry(DSC)and mechanical properties tests. The synergistic compatibilization and toughening effects of epoxy soybean oil(ESO),polyethylene glycol diglycidyl ether(PEGDE)and ethylene-methyl acrylateglycidyl methacrylate(AX8900) terpolymer are compared and analyzed. The results show that the compatibilization effect is closely related to the content and position of the epoxy group in the additives,which presenting different toughening effects. The addition of AX8900 can effectively improve the toughness of the blend system to obtain balanced mechanical properties. However,ESO tends to lead to crosslinking,which limits the toughening efficiency. PEGDE mainly shows a plasticizing effect,leading to the reduction of tensile strength. The results demonstrate modification of the PLA blends by reactive blending with different epoxy additives and hydroxy-containing polymers is an effective strategy for the development of high-performance biobased PLA materials.

关 键 词：聚乳酸 反应共混 增韧改性 离聚物 

分 类 号：O631[理学—高分子化学]