Smartly tuning supramolecular chirality in polymer gels via photoexcitation-induced cooperative self-assembly  

作　　者：Bingbing Yue Yulong Shi Fan Yang Danfeng Ye Jian Jin Pilan Zhang Shen Song Yifei Xu Hui Lin Shihui Zhu Liangliang Zhu 

机构地区：[1]School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China [2]State Key Laboratory of Molecular Engineering of Polymers,Department of Macromolecular Science,Fudan University,Shanghai 200438,China [3]College of Material Science and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,China [4]Shanghai Depeac Biotechnology Co.,Ltd.,Shanghai 201900,China [5]Burn and Plastic Surgery Department,Children’s Medical Center Affiliated to Shanghai Jiao Tong University School of Medicine,Shanghai 200120,China

出　　处：《Science China Chemistry》2025年第3期1126-1135,共10页中国科学(化学英文版)

基　　金：sponsored by the National Natural Science Foundation of China (22105128,22275038,22205038)。

摘　　要：Although supramolecular chirality tuning is prosperous in systems with small molecular building blocks,these systems lack structural strength and have limited practical applications.Conversely,polymer systems do not exhibit these drawbacks but suffer from topological chain entanglement,which often leads to large dynamic obstacles and therefore limits the tunability of supramolecular chirality.Herein,we report that by manipulating stoichiometry and employing light to alter the H-bond crosslinking between a photoexcitation-induced aggregatable molecule and high molecular weight poly(L-lactic acids),supramolecular chirality tuning of the polymer gel systems can be achieved in different ways through a cooperative self-assembly.Specifically,the Cotton effects of the examined systems can be negatively tuned by varying their stoichiometry,while positive tuning can be realized by photoirradiation.After deexcitation,negative Cotton effect tuning occurs again spontaneously in some cases.Such supramolecular chirality tuning is accompanied by rheological property tuning,demonstrating that our strategy can overcome polymer chain entanglement limitations.The proposed strategy inspires further works on the precise control of polymer chirality and,hence,development of asymmetric materials with changeable optical activity and modulus.

关 键 词：supramolecular chirality polymer gels phototuning SELF-ASSEMBLY rheological property 

分 类 号：TQ427.26[化学工程] TQ317