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Hydrophilic–hydrophobic phase transition of photoresponsive linear and macrocyclic poly(2-isopropyl-2-oxazoline)s

机译:光响应性线性和大环聚(2-异丙基-2-恶唑啉)s的亲水-疏水相变

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A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(I)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.
机译:通过Cu( I )催化的叠氮化物官能化的偶氮苯与炔烃-的环加成反应,合成了一系列含有光响应性偶氮苯部分(Az-PiPOxs)的大环和线性聚(2-异丙基恶唑啉)。带有聚(2-异丙基恶唑啉)的化合物。随着温度升高,大环和线性Az-PiPOx均表现出急剧的亲水性至疏水性相变:最初澄清的溶液在特定温度下变得混浊。偶氮苯部分的光异构化导致聚合物的热转变温度发生较大变化。 顺式异构体比反式异构体具有更高的热转变温度。因此,可以通过365和254nm的UV辐射来控制相变。

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