Thermoresponsive Helical Poly(phenylacetylene)s
Thermoresponsive Helical Poly(phenylacetylene)s
复制标题
热响应螺旋聚苯乙炔
DOI：
10.1021/ma5003529
复制
发表时间：
2014-05-27
期刊：
影响因子：
5.5
通讯作者：
Zhang, Afang
中科院分区：
文献类型：
--
作者：
Li, Shu;Liu, Kun;Zhang, Afang
合成了以树枝状低聚乙二醇（OEG）为侧基的聚苯乙炔（PPA），并对其热响应性和螺旋构象进行了研究。尽管在均聚物PPA-OEG中的庞大侧基存在空间位阻，但手性可以通过酯键有效地从侧基丙氨酸部分转移到PPA主链。为了研究侧基对手性转化的空间效应，制备了携带较小体积部分的模型PPA均聚物PPA-Boc用于比较。通过改变温度进一步研究了这些温敏PPA的手性性质，以检查其温敏性的影响。此外，PPA共聚物PPA-BDY轴承OEG树枝和荧光boradiazaindacene（BDY）发色团显示出优异的温度响应性能和有趣的荧光增强在高温下。研究了聚合物主链的刚性对热诱导荧光的影响。
Poly(phenylacetylene) (PPA) bearing dendritic oligo(ethylene glycol) (OEG) as pendants was synthesized, and its thermoresponsiveness and helical conformation were investigated. Despite the steric hindrance of the bulky pendants in the homopolymer PPA-OEG, the chirality could be efficiently transferred from pendant alanine moieties to PPA main chain through ester linkage. In order to examine the steric effect of pendants on chiral transformation, a model PPA homopolymer PPA-Boc which carries less bulky moieties was prepared for comparison. The chiroptical properties of these thermoresponsive PPAs were further investigated by varying temperature to examine the effects of their thermoresponsiveness. In addition, PPA copolymers PPA-BDY bearing OEG dendron and fluorescent boradiazaindacene (BDY) chromophore showed excellent thermoresponsive properties and interesting fluorescence enhancement at elevated temperatures. To investigate the rigidity effects of polymer backbone on the thermally induced fluorescence ...