POLYMERIZATION SHRINKAGE OF METHACRYLATE ESTERS
POLYMERIZATION SHRINKAGE OF METHACRYLATE ESTERS
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DOI：
10.1016/0142-9612(87)90030-5
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发表时间：
1987-01-01
期刊：
影响因子：
14
通讯作者：
DAVY, KWM
中科院分区：
文献类型：
--
作者：
PATEL, MP;BRADEN, M;DAVY, KWM
用密度法测定了C1 ~ C16范围内的聚（n-烷基甲基丙烯酸酯）、它们的一些异构体以及环和杂环甲基丙烯酸酯聚合物的聚合缩水率。体积收缩率随取代基侧基的大小而减小。这证明了一个事实，即聚合甲基丙烯酸酯时摩尔体积的变化在22cc /mol时是相当恒定的，与取代基的几何形状无关。然而，聚合物的玻璃化转变温度非常关键地取决于侧基的几何形状。因此，开发低收缩玻璃化聚合物的一种方法是研究大摩尔体积的甲基丙烯酸酯，但具有导致高玻璃化转变温度的侧基几何结构。聚合缩水率可用22 cc/mol的值作为摩尔体积的变化量来确定聚合物的转化程度。
The polymerization shrinkage of a range of poly(n-alkyl methacrylates) in the range C1 to C16, some of their isomers and the polymers of cyclic and heterocyclic methacrylates have been measured using densitometry. The percentage volume shrinkage decreases with the size of the substituent side group. This proved to reflect the fact that the change in molar volume on polymerizing a methacrylate ester is reasonably constant at 22 cc/mol irrespective of the geometry of the substituent group. However, the glass transition temperature of the polymer depends very critically on the geometry of the side group. Hence one method for the development of low shrinkage glassy polymers is to investigate methacrylate esters of large molar volume, but with side group geometry that results in a high glass transition temperature. Polymerization shrinkage can be used to determine the degree of conversion of a polymer, using the value of 22 cc/mol as the change in molar volume.