原子与分子物理学报2024，Vol.41Issue(4)：11-18,8.DOI:10.19855/j.1000-0364.2024.041003
水合作用与pH调控两性离子聚合物刷的相变行为
Hydration and pH regulating phase transition of zwitterionic polymer brushes
摘要
Abstract
Based on the Flory-Huggins theory,we built a theoretical model to study the phase transition behav-ior of zwitterionic polymer(ZP)brushes regulated by hydration and pH.The theoretical model takes into account the hydration of ZP,as well as the electrostatic effect in the ZP brush system.We found that the volume fraction of ZP brushes increases with the weakening hydration under different pH conditions.With the change of pH,the conformation of the ZP brush changes significantly with the hydration transition behavior,which is due to the ex-cessive net charge(positive or negative)of the pH-regulated ZP chain segment,which results in electrostatic repulsion within the ZP chain and ZP brush swells.In addition,when the ZP chain segment presents too much net charge,it will largely determine the electrostatic potential of the ZP brush system and affect the phase transi-tion behavior of the ZP brush.By investigating the free energy of the system,we also found that the free energy of the ZP brush system shows a maximum value.With the change of pH value,the maximum value of the free energy shows a change,indicating the instability of the system.And then,this leads to a phase transition in the ZP brush system.关键词
水合作用与pH/两性离子聚合物(ZP)刷/构象转变Key words
Hydration and pH/Zwitterionic polymer brushes/Switching分类
数理科学引用本文复制引用
李康睿,李循,王书恒,刘彼得,赵新军,李九智..水合作用与pH调控两性离子聚合物刷的相变行为[J].原子与分子物理学报,2024,41(4):11-18,8.基金项目
伊犁师范大学提升学科综合实力专项(22XKZY09) （22XKZY09）
伊犁师范大学"重点学科开放课题"项目(XJZDXKphy202101,XJZDXKphy202102,XJZDXKphy202203,XJZDXKphy202204) （XJZDXKphy202101,XJZDXKphy202102,XJZDXKphy202203,XJZDXKphy202204）
国家自然科学基金(22163011) （22163011）
