摘要
以原子转移自由基偶联法合成了多臂星形聚合物S-PS和星形杂臂共聚物PS-PMMA.采用傅立叶红外光谱(FT-IR)和核磁共振(1H NMR)分析方法确定了产物的结构.采用GPC法测定了产物的分子量和分子量分布.GPC分析结果表明偶联剂的偶联效率高,所得聚合物分子量增大,分子量分布窄.以DSC法研究了S-PS和PS-PMMA的热力学行为,并与相应线性均聚物的热力学行为进行了比较.发现星形PS相对线性PS均聚物,其玻璃化转变温度有所降低,且随PS臂数增加,其玻璃化转变温度降低程度明显.星形杂臂共聚物PS-PMMA只存在一个玻璃化转变温度.
Multi - arm star polystyrene and miktoarm star styrene - methyl methacrylate copolymers were synthesized by atom transfer radical coupling reaction. Their structures were confirmed by Fourier Transform Infrared （FT- IR） spectra, proton nuclear resonce （^1 H NMR ） and gel permeation chromatograph （ GPC ）. GPC studies revealed the higher coupliug efficiency and the narrow polydispersities （ 〈 1.4 ） of the resulting polymers. Their thermotropic phase transition behaviors were characterized by differential scanning calorimetry （DSC）. Compared with the related linear polymers, star polystyrene had a lower glass transition temperature （ Tg ）, which decreased notably as the number of arms increased. Miktoarm star styrene - methyl methacrylate eopolymers showed only one Tt from DSC observation.
出处
《湘潭大学自然科学学报》
CAS
CSCD
北大核心
2006年第2期61-65,共5页
Natural Science Journal of Xiangtan University
基金
湖南省自然科学基金资助项目(04JJ3044)
湖南省教育厅资助项目(03C126)
关键词
原子转移自由基偶联法
星形聚合物
星形杂臂共聚物
聚苯乙烯
聚甲基丙烯酸甲酯
atom transfer radical polymerization
coupling reaction
star copolymer
miktoarm star copolymer
polystyrene
polymethyl methacrylate
