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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Self-Assembly of Stimuli-Responsive Water-Soluble [60]Fullerene End-Capped Ampholytic Block Copolymer
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Self-Assembly of Stimuli-Responsive Water-Soluble [60]Fullerene End-Capped Ampholytic Block Copolymer

机译：响应性水溶性[60]富勒烯封端的两性嵌段共聚物的自组装

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摘要

A well-defined,water-soluble,pH and temperature stimuli-responsive [60]fullerene (C_(60)) containing ampholytic block copolymer of poly((methacrylic acid)-block-(2-(dimethylamino)ethyl methacrylate))-block-C_(60) (P(MAA-b-DMAEMA)-b-C_(60)) was synthesized by the atom transfer radical polymerization (ATRP) technique.The self-assembly behavior of the C_(60) containing polyampholyte in aqueous solution was characterized by potentiometric and conductometric titration,dynamic light scattering (DLS),and transmission electron microscopy.This amphiphilic mono-C_(60) end-capped block copolymer shows enhanced solubility in aqueous medium at room and elevated temperatures and at low and high pH but phase separates at intermediate pH between 5.4 and 8.8.The self-assembly of the copolymer is different from that of P(MAA-b-DMAEMA).Examination of the association behavior using DLS revealed the coexistence of unimers and aggregates at low pH at all temperatures studied,with the association being driven by the balance of hydrophobic and electrostatic interactions.Unimers and aggregates of different microstructures are also observed at high pH and at temperatures below the lower critical solution temperature (LCST) of PDMAEMA.At high pH and at temperatures above the LCST of PDMAEMA,the formation of micelles and aggregates coexisting in solution is driven by the combination of hydrophobic,electrostatic,and charge-transfer interactions.
机译：定义明确的，水溶性，pH和温度刺激响应性的[60]富勒烯（C_（60）），其中含有聚（（甲基丙烯酸）-嵌段-（甲基丙烯酸2-（二甲基氨基）乙基酯））的两性嵌段共聚物通过原子转移自由基聚合（ATRP）技术合成了嵌段C_（60）（P（MAA-b-DMAEMA）-b-C_（60））。C_（60）中含有多两性电解质的自组装行为通过电位滴定和电导滴定，动态光散射（DLS）和透射电子显微镜对水溶液进行表征。该两亲性单C_（60）封端嵌段共聚物在室温和高温以及低温和低温下均显示出在水性介质中的溶解性增强高pH但在5.4和8.8之间的中等pH时会发生相分离。共聚物的自组装与P（MAA-b-DMAEMA）的自组装不同。使用DLS检验缔合行为表明，低聚物下共聚体和共存在研究的所有温度下的pH值，与驱动力有关在高pH值和低于PDMAEMA的较低临界溶液温度（LCST）的温度下，还观察到不同微观结构的单体和聚集体。在高pH值和高于PDMAEMA的LCST的温度下，疏水，静电和电荷转移相互作用的结合驱使溶液中共存的胶束和聚集体形成。

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