Radical high polymerization of β-monoalkyl itaconates and characterization of the resulting polymers
Radical high polymerization of β-monoalkyl itaconates and characterization of the resulting polymers
复制标题
β-衣康酸单烷基酯的自由基高聚合及所得聚合物的表征
DOI：
10.1007/bf00310785
复制
发表时间：
1991
期刊：
影响因子：
3.2
通讯作者：
T. Otsu
中科院分区：
文献类型：
--
作者：
Jianzhou Yang;T. Otsu
研究了不同β-单烷基取代基衣康酸酯的自由基聚合行为。核磁共振易于在60∼90°C下进行均聚，得到相对分子质量为23,000∼306,000的聚合物。所得聚合物的产率和相对分子质量与烷基取代基略有关系，明显高于衣康酸二烷酯(DRI)。在β-单乙酯和单叔丁基衣康酸酯与苯乙烯的共聚反应中，这些单体对聚苯乙烯自由基表现出相似的反应活性。聚(核磁共振)S在水和有机溶剂中的溶解度随烷基取代基结构的不同而不同。在氮气气氛中的热重分析表明，大部分聚(核磁共振)S的起始分解温度约为150℃，聚衣康酸单叔丁酯的起始分解温度约为100℃。
SummaryRadical polymerization behavior of itaconates with various β-monoalkyl substituents (mRI) was investigated. mRIs homopolymerize easily in bulk at 60∼90°C, to give polymers with molecular weight of 23,000∼306,000. The yield and the molecular weight of the resulting polymers were found to be slightly dependent on the alkyl substituents, and apparently higher than those of dialkyl itaconates (DRI). In the copolymerization of β-monoethyl and mono-tert-bytyl itaconates with styrene, these monomers exhibited similar reactivity toward polystyryl radical. the solubility of the poly(mRI)s in water and organic solvents varied with the structure of the alkyl substituent. Thermogravimetric analysis in a nitrogen atmosphere revealed that the initial decomposition temperatures for most of poly-(mRI)s were observed at about 150°C and poly (mono-tert-butyl itaconate) decomposed at ca. 100°C.