PLA/E-MA-GMA/PBS复合材料力学及生物分解性能研究

Study on Mechanical and Biodegradation Performance of PLA/E-MA-GMA/PBS Composites

文章通过共混改性的方法提升聚乳酸(PLA)的韧性,获得抗冲击的生物降解材料。在PLA中加入乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物(E-MA-GMA)和聚丁二酸丁二醇酯(PBS),通过共混熔融反应加工的方法,制备PLA/E-MA-GMA/PBS复合材料,研究了不同E-MA-GMA含量对复合材料的热学性能、流变性能、流动性能、力学性能、相形态、生物分解性能的影响。结果表明:当E-MA-GMA含量为5%~25%时,PLA/E-MA-GMA/PBS复合材料生物分解率均大于60%,符合GB/T 19277.1—2011中生物分解塑料要求。E-MA-GMA可以显著提升PLA/E-MA-GMA/PBS复合材料的韧性和冲击强度,同时进一步说明PLA/E-MA-GMA/PBS复合材料之间存在部分相容性。随着E-MA-GMA含量的增加,PLA/E-MA-GMA/PBS复合材料的复数黏度显著提高,各组分之间发生分子链缠结增强,E-MA-GMA、PLA和PBS之间发生明显的相互作用。

The purpose of this paper is to improve the toughness of polylactic acid(PLA)through the method of blending modification to obtain impact resistant biodegradable materials.PLA/EMA-GMA/PBS composites were prepared by adding ethylene-methyl acrylate-glycidyl methacrylate copolymer(EMA-GMA)and polybutylene succinate(PBS)to PLA by the method of blending and melting reaction processing.The influences of different EMAGMA content on the thermal properties,rheological properties,flowability,mechanical properties,phase morphology,and biological decomposition properties were studied.The results show that when the EMAGMA content is 5%~25%,the biological decomposition rate of PLA/EMAGMA/PBS composites is larger than 60%,which meets the requirements of biodegradable plastics in GB/T 19277.1—2011.E-MA-GMA can significantly improve the toughness and impact strength of PLA/EMAGMA/PBS composites,and further shows that there is partial compatibility between PLA/EMAGMA/PBS composites.With the increase of EMAGMA content,the complex viscosity of the PLA/EMAGMA/PBS composites increases remarkedly,the molecular chain entanglement of different components.There is a significant interaction between E-MA-GMA,PLA,and PBS.