用溶液聚合的方法在不同投料比下合成了不同转化率的苯乙烯-丙烯酸丁酯无规共聚物,低转化率下共聚物的组成用1H-NMR测定,聚合物的玻璃化温度(Tg)用差示扫描量热法(DSC)测量.采用非线性最小二乘法(NLLS)计算得到单体的竞聚率rSt=0.831,rBA=0.187,不同转化率瞬时共聚物含量由竞聚率、投料比计算,Tg用前期提出的共聚物Tg组成关系方程计算,累计产品的Tg由瞬时共聚物Tg用Fox公式加和而得,按此种方法预测的St-BA共聚物Tg-转化率关系与实验结果基本一致.
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