Thermo- and pH-responsive behaviors of aqueous poly(acrylic acid)/poly(4-vinylpyridine) complex material characterized by ATR-FTIR and UV–Vis Spectroscopy

Thermo- and pH-responsive behaviors of aqueous poly(acrylic acid)/poly(4-vinylpyridine) complex material characterized by ATR-FTIR and UV–Vis Spectroscopy
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通过 ATR-FTIR 和紫外可见光谱表征水性聚(丙烯酸)/聚(4-乙烯基吡啶)复合材料的热响应和 pH 响应行为

DOI:
10.1016/j.eurpolymj.2014.09.017
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发表时间:
2014-11
影响因子:
6
通讯作者:
Zhan Chen
Zhan Chen
中科院分区:
化学2区
文献类型:
--
作者:
Bolin Li;Xiaolin Lu;Yonghao Ma;Zhan Chen

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本研究开发了一种具有上限临界溶液温度 (UCST) 的新型热响应性和 pH 响应性聚丙烯酸 (PAA)/聚 (4-乙烯基吡啶) (P4VP) 水性材料。研究发现,水性络合物材料的形成是由P4VP分子的吡啶鎓基团去质子化以及随后吡啶和羧基之间形成氢键引起的。当改变 pH 值和温度值时,这种水性材料在浑浊胶体和透明溶液状态之间表现出显着的可逆转变行为。此外,溶液 pH 值与上临界溶液温度 (UCST) 之间的相关性使我们能够设计具有广泛可调转变温度范围的响应性水性材料。
A novel thermo- and pH-responsive poly(acrylic acid) (PAA)/poly(4-vinylpyridine) (P4VP) aqueous material with an upper critical solution temperature (UCST) was developed in this study. It was found that the formation of the aqueous complex material was caused by the deprotonation of pyridinium groups of P4VP molecules and consequent hydrogen bonding formation between pyridine and carboxylic groups. This aqueous material exhibited significant reversible transition behaviors between the turbid colloidal and transparent solution states upon altering the pH and temperature values. Furthermore, the correlation between the solution pH and the upper critical solution temperature (UCST) enables us to design responsive aqueous materials with a broadly adjustable transition temperature range.
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