超临界CO_(2)发泡PBAT/PLA复合材料及其形状记忆性能  

Preparation and shape memory properties of PBAT/PLA foams by supercritical CO_(2)

作　　者：宫政 高秀鲁 赵玲[1] 胡冬冬[1] GONG Zheng;GAO Xiulu;ZHAO Ling;HU Dongdong(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工学院,化学工程联合国家重点实验室,上海200237

出　　处：《化工学报》2025年第2期888-896,共9页CIESC Journal

基　　金：化学工程联合国家重点实验室开放课题项目(SKL⁃ChE⁃22C02)。

摘　　要：采用超临界CO_(2)辅助制备生物可降解聚己二酸对苯二甲酸丁二醇酯(PBAT)/聚乳酸(PLA)形状记忆发泡材料,研究了PLA含量对PBAT/PLA复合材料中CO_(2)溶解扩散行为、熔融结晶、流变行为及发泡行为的影响,考察了PLA含量对PBAT/PLA发泡材料的形状记忆性能和力学性能的影响。结果表明,PBAT有利于PLA分子链段局部运动,促进了PLA的冷结晶过程;在低频剪切作用下,随着PLA含量的增加,PBAT/PLA的复数黏度增加;PLA降低了CO_(2)在PBAT/PLA复合材料中的解吸扩散系数,提高了发泡材料的刚性,起到稳定泡孔形貌和抗收缩的作用;PLA质量分数20%时,复合材料获得最大稳定发泡倍率20.5倍,PBAT/PLA发泡材料(发泡倍率7.5)形状固定率为86.8%,形状恢复率为94.3%,综合性能最佳。PLA有利于提高PBAT/PLA发泡材料的形状固定率,但不利于其形状恢复率。同时,PLA质量分数低于20%时,PLA的引入提高了PBAT/PLA发泡材料的拉伸/压缩模量和强度。Supercritical CO_(2)was used to assist the preparation of biodegradable poly(butylene adipate terephthalate)(PBAT)/polylactic acid(PLA)shape memory foaming materials.The impacts of PLA content on CO_(2)solubility and desorption behavior,melting and crystallization,rheological behavior,and foaming behavior of PBAT/PLA composites were studied.The impacts of PLA content on shape memory properties and mechanical properties of PBAT/PLA foams were also studied.The results show that PBAT is conducive to the local movement of PLA molecular segments and promotes the cold crystallization process of PLA.Under low-frequency shear,as PLA content increased,the complex viscosity of PBAT/PLA increased.The diffusion coefficient of CO_(2)was fitted from Fick diffusion law.PLA reduced the diffusion coefficient of CO_(2)in PBAT/PLA composites during the desorption process,improved the rigidity of the foams and played an anti-shrinkage role.At the PLA content of 20%(mass),PBAT/PLA composite obtained a maximum stabilized expansion ratio of 20.5.PLA was crucial for enhancing the shape fixing ratio of PBAT/PLA foams,while it was unfavorable to the shape recovery ratio.When PLA content was 20%(mass),PBAT/PLA foam had the great comprehensive performance with an expansion ratio of 7.5,a shape fixing ratio of 86.8%and a shape recovery ratio of 94.3%.Additionally,when PLA content was below 20%(mass),the tensile/compressive modulus and strength of PBAT/PLA foams increased with the increase of PLA content.

关 键 词：超临界二氧化碳 聚合物加工 泡沫 生物可降解 形状记忆性能 

分 类 号：TQ317.9[化学工程—高聚物工业]