界面强化增容反应程度对PLA/PBAT共混物结构和性能的影响  

Effect of Interfacial Strengthening Compatibilization Efficiency on the Structures and Properties of PLA/PBAT Blends

作　　者：王平 宋涛[1,3] 刘文秀 唐浩源 刘佳佳 朱露芳 宋杰 曹田 冯绍杰[1,2,3] WANG Ping;SONG Tao;LIU Wenxiu;TANG Haoyuan;LIU Jiajia;ZHU Lufang;SONG Jie;CAO Tian;FENG Shaojie(School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;Anhui Province International Research Center on Advanced Building Materials,Anhui Jianzhu University,Hefei 230601,China;Special Wire and Cable National Local Joint Engineering Research Center Anhui Jianzhu University Branch Center,Hefei 230601,China)

机构地区：[1]安徽建筑大学材料与化学工程学院,安徽合肥230601 [2]安徽建筑大学安徽省先进建筑材料国际联合研究中心,安徽合肥230601 [3]特种电线电缆国家地方联合工程研究中心安徽建筑大学分中心,安徽合肥230601

出　　处：《塑料工业》2024年第4期165-174,共10页China Plastics Industry

基　　金：国家自然科学基金(51903002);安徽省科技重大专项项目(202103a05020031);安徽省高校自然科学杰出青年科研项目(2022AH020024);安徽省自然科学基金优秀青年科学基金项目(2308085Y34);安徽省高校哲学社会科学重大研究项目(2022AH040047);安徽省高校省级自然科学研究项目(YJS20210509);安徽省博士后研究人员科研活动经费资助项目(2020B413);安徽建筑大学博士启动资金(2023QDZ23);安徽高校协同创新项目(GXXT-2023-098);安徽高校自然科学研究项目(K2210022)。

摘　　要：通过熔融共混法将具有不同环氧含量的界面增容剂(Joncryl ADR-4400和Joncryl ADR-4468)引入聚乳酸(PLA)/聚对苯二甲酸-己二酸丁二醇酯(PBAT)共混物中,并采用转矩流变仪、傅里叶红外光谱仪、差示扫描量热仪、动态热机械分析仪、流变仪、电子万能试验机和扫描电子显微镜等仪器研究界面增容反应程度对PLA/PBAT共混物微观分子链行为及宏观性能的影响。结果表明,界面增容剂结构中的环氧基团通过与PLA和PBAT的羟基或羧基反应,在两相界面处形成微交联结构,增强两相界面的相互作用,最终提高共混物的力学性能。材料的宏观性能测试表明,与环氧当量较高的ADR-4400相比,ADR-4468的引入形成了更加完善的微交联结构,界面相互作用更强,使PLA/PBAT/ADR-4468共混物中PLA的玻璃化转变温度提高至54.7℃。当ADR-4468添加量为0.75%时,PLA/PBAT/ADR-4468共混物拉伸强度达36.4 MPa,断裂伸长率达302%,缺口冲击强度可达9.6 kJ/m^(2),较未改性PLA/PBAT分别提高18%、560%和69%,材料刚韧平衡性优良。A series of interfacial compatilizers(Joncryl ADR-4400 and Joncryl ADR-4468)with different epoxy equivalents were introduced into the polylactide/poly(butylene adipate-co-terephthalate)(PLA/PBAT)blends by melt blending.The effects of interfacial compatibilization reaction efficiency on the microstructural transitions and macroscopic properties of PLA/PBAT blends were investigated by using torque rheometer,Fourier-transformed infrared,differential scanning calorimetry,dynamic mechanical analysis,rotational rheometer,universal testing machine and scanning electron microscopy.The results indicate that the epoxy groups of the interfacial compatilizers react with the carboxyl and hydroxyl terminal groups of PLA and PBAT,leading to the formation of the micro-crosslink structures at the interfaces the two phases,which can increase the interfacial adhesion and significantly enhance the mechanical properties of the material.The macroscopic properties of the material are shown that the introduction of ADR-4468 facilitates the better cross-linking structures and stronger interfacial interactions compared to the ADR-4400 with high epoxy equivalent.The glass transition temperature of PLA in the PLA/PBAT/ADR blend increases to 54.7℃.Specifically,when the ADR-4468 content reaches 0.75%,the tensile strength,elongation at break and notch impact strength of PLA/PBAT/ADR-4468 blend are respectively 36.4 MPa,302%and 9.6 kJ/m 2,increasing by 18%,560%and 69%compared with the unmodified PLA/PBAT blend.The PLA/PBAT/ADR-4468 material has an excellent balance between rigidity and toughness.

关 键 词：聚乳酸 聚对苯二甲酸己二酸丁二醇酯 界面增容 熔融共混 力学性能 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]