壳聚糖接枝PGMA增容PLA/PBAT复合材料的结构与性能  

Structure and Properties of Poly(Lactic Acid)/Poly(butyleneadipate-co-terephthalate)Composites Compatibilized with Chitosan Grafting PGMA

作　　者：朱晔[1] 张鑫[2] 杨海存 何明阳[1] Zhu Ye;Zhang Xin;Yang Haicun;He Mingyang(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China;National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization,Changzhou University,Changzhou 213164,China;National Experimental Demonstration Center for Materials Science and Engineering,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]常州大学生物质高效炼制及高质化利用国家地方联合工程研究中心,江苏常州213164 [3]常州大学材料科学与工程学院材料科学与工程国家级实验教学示范中心,江苏常州213164

出　　处：《工程塑料应用》2023年第10期1-7,共7页Engineering Plastics Application

摘　　要：采用离子交联和表面引发接枝聚合法(SIP)制备了壳聚糖接枝聚甲基丙烯酸缩水甘油酯改性纳米粒子(CSPGMA),使用傅里叶变换红外光谱和扫描电子显微镜(SEM)对合成的CS-PGMA进行了表征。结果表明,通过离子交联和SIP成功制得CS-PGMA改性纳米粒子,且分散情况得到明显改善。以CS-PGMA为增容剂,通过熔融共混法制备聚乳酸(PLA)/聚(对苯二甲酸-己二酸丁二酯)(PBAT)/CS-PGMA三元复合材料,采用SEM、拉伸性能测试、差示扫描量热、动态热机械分析、热重和降解试验等考察了CS-PGMA含量对复合材料微观结构、力学性能、熔融结晶行为、界面相容性、热稳定性和降解性能的影响。结果表明,PLA和PBAT为热力学不相容体系,CS-PGMA能有效增容PLA/PBAT共混物。随CS-PGMA含量增大,复合材料拉伸强度呈先增大后降低的趋势,降解率呈先下降后增大的趋势,热稳定性逐渐下降。少量CS-PGMA可促进冷结晶,但当其质量分数超过2%时,冷结晶逐渐受限。当CS-PGMA质量分数为4%时,拉伸强度最高为47.85 MPa,断裂伸长率为225.03%,满足柔性包装材料的使用要求。Chitosan grafted with poly(glycidyl methacrylate)(CS-PGMA)modified nanoparticles were prepared by the combination of ionic crosslinking and surface initiated graft polymerization(SIP),and the prepared CS-PGMA nanoparticles were characterized by Fourier transform infrared spectrum and scanning electron microscopy(SEM).The results show that CS-PGMA modified nanoparticles with an improving dispersity are successfully prepared by ionic crosslinking and SIP.Then poly(lactic acid)(PLA)/poly(butyleneadipate-co-terephthalate)(PBAT)/CS-PGMA ternary composites were prepared by melt blending by using CS-PGMA as compatibilizer.The effects of CS-PGMA content on the microstructure,mechanical properties,melting crystallization behaviors,interfacial compatibility,thermal stability and degradation properties of the composites were investigated in detail by SEM,tensile test,differential scanning calorimetry,dynamic thermomechanical analysis,thermogravimetric analysis and degradation experiment.The results show that PLA and PBAT are thermodynamically incompatible systems,and CS-PGMA nanoparticles can effectively improve the compatibility of PLA/PBAT blends.With the increase of CS-PGMA content,the tensile strength of the composites is increased first and then decreased,the degradation rate is decreased first and then increased,and the thermal stability is gradually decreased.A small amount of CS-PGMA can promote cold crystallization,and when the content of CS-PGMA exceeds 2 wt%,the cold crystallization gradually becomes limited.When the content of CS-PGMA is 4 wt%,the maximum tensile strength is 47.85 MPa and the elongation at break is 225.03%,which meets the requirements of flexible packaging materials.

关 键 词：聚乳酸 聚(对苯二甲酸-己二酸丁二酯) 壳聚糖 三元复合材料 反应增容 结构 性能 

分 类 号：TQ340.64[化学工程—化纤工业]