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含笼型倍半硅氧烷（POSS）的双重敏感性聚合物的合成及其自组装研究
李沙沙;李齐方;陈广新;周 政
北京化工大学学报（自然科学版） ›› 2015, Vol. 42 ›› Issue (4) : 57-62.
PDF(815 KB)
PDF(815 KB)
含笼型倍半硅氧烷（POSS）的双重敏感性聚合物的合成及其自组装研究
Synthesis and self-assembly of dual-stimuli responsive POSS end-capped amphiphilic block copolymers
通过两次原子转移自由基聚合（ATRP）制备了含有笼型倍半硅氧烷（POSS）的温度和pH双重敏感的两亲性聚合物POSS-PMEO2MA-b-PDMAEMA，并采用GPC和1H-NMR对引发剂和聚合物的化学结构进行了表征。利用动态光散射（DLS）、荧光光谱仪、透光率测试等手段研究了聚合物在水溶液中的自组装。结果表明，在较低温度下聚合物在水中自组装形成球形胶束，温度高于临界溶解温度（LCST）后，胶束脱水发生聚集，形成更大尺寸的聚集体；调整溶液的pH值为9时，聚合物的浊点温度下降；聚合物胶束的尺寸随着pH值的升高而减小。通过改变温度和pH值都能调控聚合物在水中的自组装形态。
Well-defined pH-and thermo-responsive amphiphilic block copolymer POSS-poly(2-(2-methoxyethoxy)ethyl methacrylate)-block-poly (dimethylaminoethy methacrylate) (POSS-PMEO2MA-b-PDMAEMA) has been successfully synthesized by ATRP,and the structure of the polymer was identified by GPC and 1H-NMR. POSSPMEO2MA-b-PDMAEMA could self-assemble into spherical micelles,and larger aggregates were formed when the temperature values were above the LCST. Due to the pH responsivity of PDMAEMA chains,the size of the micelles and cloud point decreased with increasing pH. The micelles showed tunable temperature- and pH-responsive properties.
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