The correlation between thermally induced precipitateto-coacervate transition and glass transition in a polyelectrolyte-bolaamphiphile complex  

作　　者：Xiaoqing Liu Zhihui Shi Feng Yu Chao Teng Chen Zhang Zhong-Ren Chen 

机构地区：[1]Institute of Critical Materials for Integrated Circuits,Shenzhen Polytechnic,Shenzhen,China [2]Shenzhen Grubbs Institute and Department of Chemistry,Southern University of Science and Technology,Shenzhen,China [3]Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen,China

出　　处：《Aggregate》2023年第5期189-198,共10页聚集体（英文）

基　　金：State Key Research Development Programme of China,Grant/Award Number:2021YFB3800702;National Natural Science Foundation of China,Grant/Award Number:21902073;Shenzhen Science and Technology Innovation Committee,Grant/Award Number:JSGG20210629144802007;Post-Doctoral Later-Stage Foundation Project of Shenzhen Polytechnic,Grant/Award Number:6021271003K。

摘　　要：The precipitate and the coacervate are two aggregated states in the polyelectrolyte complexes(PECs).The precipitate-to-coacervate transition and glass transition in PECs have been widely reported in the past.In many cases,the two phenomena are studied independently,although both of them are apparently affected by water and small ions.Here,utilizing a PEC system consisting of poly(acrylic acid)(PAA)and a cationic bolaamphiphile(DBON),we explore the states of PECs as a function of salt,temperature,and the molecular weight of PAAs.By a combination of microscopic observation,time-resolved fluorescence measurements,and differential scanning calorimetry,we identify salt/temperature driven precipitate-to-coacervate transitions of the complexes.The thermally induced morphology transformation from the precipitate to coacervate occurs around the glass transition temperature,indicating a strong correlation between the two processes.As the molecular weight of the PAA increases,the thermal transition temperature becomes higher.This finding offers new insights on the mechanistic interactions that dictate the aggregated states of PECs.Based on the photothermal effect of DBON,we also develop a UV light-induced strategy to mediate the precipitate-to-coacervate transition,providing a fantastic platform to create functional PEC materials.

关 键 词：aggregation-induced emission COACERVATE glass transition polyelectrolyte complex PRECIPITATE 

分 类 号：TG1[金属学及工艺—金属学]