模型化研究高分子凝胶体积相变中的共非溶性作用  

Modeling study on theroles of co-nonsolvency involume transition of polymer gels

作　　者：李康睿 李循[3] 王书恒 刘彼得 王利云 赵新军 李九智[3] LI Kang-Rui;LI Xun;WANG Shu-Heng;LIU Bi-De;WANG Li-Yun;ZHAO Xin-Jun;LI Jiu-Zhi(Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters,College of Physical Science and Technology,Yili Normal University,Yining 835000,China;Laboratory of Micro-Nano Electro Biosensors and Bionic Devices,Yili Normal University,Yining 835000,China;Department of Urology,the Xinjiang Uygur Autonomous Region People’s Hospital,Urumqi 830000,China)

机构地区：[1]伊犁师范大学物理科学与技术学院新疆凝聚态相变与微结构实验室,伊宁830000 [2]伊犁师范大学微纳电传感器技术与仿生器械实验室,伊宁830000 [3]新疆维吾尔自治区人民医院泌尿外科,乌鲁木齐830000

出　　处：《原子与分子物理学报》2024年第6期132-138,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(22163011);伊犁师范大学提升学科综合实力专项项目(22XKZY09)。

摘　　要：基于Flory-Huggins理论,我们建立理论模型,研究在共非溶剂(CNS)中,高分子凝胶(PG)体积相变中的共非溶性作用.理论模型考虑PG中CNS的桥接作用、各种分子的混溶效应.研究发现,当CNS与高分子单体间的吸引强度较小时,CNS与高分子单体间桥接作用的减弱,会导致PG体积相变.当CNS与高分子单体间的吸引作用强度较大时,随着CNS与高分子单体间桥接作用的减弱,PG的体积分数呈现两次台阶式的转变,表明PG体系出现两次体积相变.这是由于桥接作用的减弱,虽然会有部分CNS分子被排挤出PG,但是并未完全消除CNS与高分子单体间的桥接吸引作用.所得理论结果符合实验观测,由此表明了共非溶性作用会在很大程度上调控PG的相变行为.Based on the Flory-Huggins theory, we built a theoretical model to study the role of co-nonsolvency in the volume phase transition of polymer gel (PG ) in co-nonsolvent (CNS ). The theoretical model considers the bridging effect of CNS in PG and the miscibility effects of various molecules. We found that when the attraction strength between CNS and polymer monomer is low, the bridging effect between CNS and polymer monomer is weakened, which will lead to the volume phase transition of PG. When the attraction between CNS and polymer monomer is strong, with the weakening of the bridging between CNS and polymer monomer, the volume fraction of PG presents two step transitions, indicating that the PG presents two volume transitions. Because of the weakening of the bridging effect, although some CNS molecules will be squeezed out of the gel, the bridging attraction between CNS and polymer monomer has not been completely eliminated. The theoretical results are consistent with the experimental observations, which indicates that the phase transition behavior of PG can be controlled to a large extent by the co-nonsolvency.

关 键 词：高分子凝胶 共非溶性 体积相变 

分 类 号：O484[理学—固体物理]