Tuning of thermally induced sol-to-gel transitions of moderately concentrated aqueous solutions of doubly thermosensitive hydrophilic diblock copolymers poly(methoxytri(ethylene glycol) acrylate)-b-poly(ethoxydi(ethylene glycol) acrylate-co-acrylic acid).
作者： Naixiong Jin , Hao Zhang , Shi Jin , Mark D. Dadmun , Bin Zhao
DOI: 10.1021/JP300298A
关键词: Ethylene glycol 、 Acrylic acid 、 Polymerization 、 Polymer chemistry 、 Acrylate 、 Chemistry 、 Aqueous solution 、 Polymer 、 Lower critical solution temperature 、 Chain transfer
摘要: We report in this article a method to tune the sol-to-gel transitions of moderately concentrated aqueous solutions doubly thermosensitive hydrophilic diblock copolymers that consist two blocks exhibiting distinct lower critical solution temperatures (LCSTs) water. A small amount weak acid groups is statistically incorporated into LCST block so its can be tuned by varying pH. Well-defined copolymers, poly(methoxytri(ethylene glycol) acrylate)-b-poly(ethoxydi(ethylene acrylate-co-acrylic acid) (PTEGMA-b-P(DEGEA-co-AA)), were prepared reversible addition–fragmentation chain transfer polymerization and postpolymerization modification. PTEGMA PDEGEA are water-soluble polymers with LCSTs 58 9 °C, respectively, 25 wt % PTEGMA-b-P(DEGEA-co-AA) molar ratio DEGEA AA units 100:5.2 at pH = 3.24 underwent multiple phase upon heating, from clear, free-flowing liquid (<15 °...
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