TMI和苯乙烯溶液共聚合的竞聚率

以甲苯为溶剂和偶氮二异丁腈（AIBN）为引发剂,研究3 异丙烯基-α,α′-二甲基苄基-异氰酸酯(TMI)和苯乙烯（St）溶液共聚合的竞聚率和共聚产物（PS-co-TMI）的相对分子质量及分子质量分布.通过对共聚物产物的傅里叶红外（FTIR）分析,证实了在低转化率（<6%）下成功合成了PS-co-TMI.引入带荧光性官能团的9 (甲氨基-甲基)蒽（MAMA）,通过紫外(UV)确定PS-co-TMI的组成；采用Kelen-Tudos正序和逆序法、YBR法和多元线性回归最小二乘法确定TMI（1）和St（2）的竞聚率为：r1=0.27、r2=0.91.凝胶滲透色谱（GPC）分析表明：TMI与St单体的加料量比增加,PS-co-TMI的相对分子质量和分子质量分布均减小.

Monomer reactivity ratios of TMI and styrene solution copolymerization

In the presence of toluene as solvent and azobisisobutyronitrile (AIBN) as initiator, the monomer reactivity ratios of 3-isopropenyl-α,α′-dimethylbenzyl isocyanate (TMI) and styrene (St), and molecular weight and molecular weight distribution of as synthesized copolymer (PS-co-TMI) were analyzed. Fourier infrared (FTIR) analysis of as-synthesized copolymer showed that PS-co-TMI was successfully synthesized under the overall conversions less than 6%. The copolymer composition of PS-co-TMI was determined by ultraviolet （UV） measurement with introducing 9-(methylaminomethyl) anthracene (MAMA) bearing fluorescence groups into PS-co-TMI. Using the methods of positive Kelen-Tudos, reversed Kelen Tudos, YBR and multiple linear regression least square, the reactivity ratios of TMI(1) and St(2) were obtained as r1=0.27, r2=0.91. Gel permeation chromatography (GPC) analysis showed that the molecular weight and molecular weight distribution of PS-co-TMI decreased with the increase of TMI/St feeding ratio.