凝固浴温度对再生纤维素材料结构与性能的影响研究  

Effect of Coagulation Bath Temperature on the Structure and Properties of Regenerated Cellulose Materials

作　　者：卢洪超 夏钲豪 米勤勇[2] 张金明[2] 余坚[2] 张军[2,3] Hong-chao Lu;Zheng-hao Xia;Qin-yong Mi;Jin-ming Zhang;Jian Yu;Jun Zhang(SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013;CAS Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190;School of Chemical Science,University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国石化北京化工研究院,北京100013 [2]中国科学院化学研究所中国科学院工程塑料重点实验室,北京100190 [3]中国科学院大学化学科学学院,北京100049

出　　处：《高分子学报》2023年第7期1064-1073,共10页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52173292,U2004211)资助项目.

摘　　要：以1-烯丙基-3-甲基咪唑氯盐(AmimCl)离子液体为纤维素溶剂,水为凝固浴,通过调控凝固温度分别在不同凝固浴温度下获得再生纤维素气凝胶和再生纤维素膜,研究了再生纤维素气凝胶和再生纤维素膜的微观结构与性能的关系.结果表明:凝固浴温度对再生纤维素气凝胶和再生纤维素膜的微观结构影响显著,进而影响再生纤维素气凝胶膜和再生纤维素膜的光学性能和力学性能,从而建立了凝固浴温度与再生纤维素材料结构和性能之间的关系,对以离子液体为溶剂的再生纤维素材料工业化生产具有一定的指导意义.Using 1-allyl-3-methylimidazolium chloride(AmimCl)ionic liquid as the cellulose solvent and water as the coagulation bath,regenerated cellulose aerogels and regenerated cellulose films were obtained at different coagulation bath temperatures by regulating the coagulation temperature,and the relationship between the microstructure and properties of regenerated cellulose aerogels and regenerated cellulose membranes was investigated.The results show that the coagulation bath temperature has a significant effect on the microstructure of regenerated cellulose aerogels and regenerated cellulose films,which in turn affects the optical and mechanical properties of regenerated cellulose aerogel films and regenerated cellulose films.When the coagulation bath temperature is low,the diffusion rate of ionic liquid into the coagulation bath is slow,the regeneration rate of cellulose solution is slow,and the structural difference between the surface and the interior of the cellulose hydrogel is smaller and denser.When the coagulation bath temperature is high,the diffusion rate of ionic liquid into the coagulation bath is faster,the regeneration rate of cellulose solution is faster,and the structural difference between the surface and the interior of the cellulose hydrogel is larger and looser.With the increase of the coagulation bath temperature,the pore size of the cellulose aerogel increases,the porosity increases,the specific surface area decreases,and more importantly,the surface pore size is obviously larger than the internal pore size,and this difference increases significantly with the increase of the coagulation bath temperature.The changes in the microstructure of the cellulose aerogel resulted in the decrease of its mechanical strength,Young’s modulus,elongation at break and light transmission from 3.1 MPa,41.5 MPa,24.7% and 88.82% to 0.2 MPa,7.3 MPa,4.6%and 0.07%,respectively.However,with the increase of coagulation bath temperature,the crystallinity of regenerated cellulose film decreases and the surface roughness

关 键 词：纤维素 离子液体 凝胶 薄膜 结构与性能 

分 类 号：TQ352.7[化学工程]