摘要
以纤维素纳米纤维为基体,聚乙烯醇、木质素为增塑剂,戊二醛为交联剂,并引入聚乙烯亚胺(PEI),采用蒸发诱导自组装法制备了具有水和pH响应形状记忆性能的复合膜。通过傅立叶变换红外光谱(FTIR)仪表征膜的结构,通过水响应形状记忆回复性能测试、湿度为70%的空气、盐酸及氨水刺激形变测试研究膜的水和pH响应性能;采用万能试验机测试表征复合膜在吸水前后的拉伸性能的变化情况。结果表明,PEI用量可调节复合膜的化学交联和氢键网络结构。添加PEI能有效提高膜的水响应性能和力学性能。当PEI质量分数为2.5%时复合膜在水中可于3 s内完全回复初始形状。吸水后未添加PEI的复合膜湿强度约为吸水前膜强度的1/60,当添加PEI后,复合膜湿强度减小至吸水前膜强度的1/15~1/10。复合膜具有pH响应特性。在湿空气和碱性湿气体中,PEI质量分数为10%时,膜的响应形变角度最大。在酸性湿气体中,无PEI的复合膜的响应形变角度最大。相同PEI用量的复合膜的形变角度在碱性湿气体中最大,湿空气中次之,酸性湿气体中最小。
With cellulose nanofibers as matrix,polyvinyl alcohol and lignin as plasticizers,glutaraldehyde as cross-linking agent and polyethyleneimine(PEI)introduced,the composite membrane with shape memory properties of water and pH response was prepared by evaporation-induced self-assembly.The structure of the membrane was characterized by Fourier transform infrared reflection(FTIR),and the water response and pH response of the membrane were studied by water response shape memory recovery performance test,air with humidity of 70%,hydrochloric acid and ammonia water stimulation deformation test.Universal testing machine was used to test and characterize the change of tensile properties of the composite film before and after water absorption.The results show that the amount of PEI can adjust the chemical crosslinking and hydrogen bond network structure of the composite membrane.Adding PEI can effectively improve the water response and mechanical properties of the membrane.When the amount of PEI is 2.5%,the composite membrane can completely recover its original shape within 3 s in water.The wet strength of the composite film without PEI after water absorption is about 1/60 of that before water absorption.When PEI is added,the wet strength of the composite film decreases by 1/15-1/10 of that before water absorption.The composite membrane has pH response characteristics.When the amount of PEI is 10%in wet air and alkaline wet gas,the response deformation angle of the film is the largest.In acidic wet gas,the response deformation angle of the composite film without PEI is the largest.The deformation angle of the composite membrane with the same amount of PEI is the largest in alkaline wet gas,followed by wet air and the smallest in acid wet gas.
作者
蒙多
赵强莉
程小悦
吴佳豪
杨立强
严光林
赵小亮
王斌
Meng Duo;Zhao Qiangli;Cheng Xiaoyue;Wu Jiahao;Yang Liqiang;Yan Guanglin;Zhao Xiaoliang;Wang Bin(School of Materials Science and Engineering,Xi’an Polytechnic University,Xi’an 710048,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2022年第3期8-13,共6页
Engineering Plastics Application
基金
陕西省教育厅项目(19JK0371)
陕西省科技厅项目(2019JQ-846)
陕西省教育厅重点科学研究计划协同创新中心项目(20JY027)
陕西省重点研发计划项目(2020NY-154)。
关键词
纳米纤维素
聚乙烯亚胺
水响应形状记忆
pH响应形变
湿强度
nano cellulose
polyethyleneimine
water response shape memory
pH response deformation
wet strength
