Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB2 Monomer
Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB2 Monomer
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DOI：
10.3390/polym4021170
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发表时间：
2012-05
期刊：
影响因子：
5
通讯作者：
Y. Ohta;Yusuke Kamijyo;A. Yokoyama;T. Yokozawa
中科院分区：
文献类型：
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作者：
Y. Ohta;Yusuke Kamijyo;A. Yokoyama;T. Yokozawa
以带有N-三乙二醇甲酯（TEG）链的5-氨基丙酸甲酯1为AB 2单体进行缩聚反应，并对所得超支化聚酰胺（HBPA）的性能进行了研究。当1与N-甲基核引发剂2b以1：2b的各种进料比进行聚合时，（[1]0/[2b]0）在LiHMDS和LiCl的存在下，在-10 °C下，所得HBPA的Mn值与[1]0/[2b]0比率成比例地从7增加到46（Mn = 3810-18600），保持窄的分子量分布（Mw/Mn = 1.11-1.19）。HBPA可溶于水，并且HBPA的0.25重量%水溶液显示出较低的临界溶解温度（LCST）。浊点为21-23 °C，这比具有N-TEG单元的相应聚（间苯甲酰胺）的浊点低约30 °C。
Condensation polymerization of 5-aminoisophthalic acid methyl ester 1 bearing a N-tri(ethylene glycol) methyl ester (TEG) chain as an AB2 monomer was conducted and the properties of the resulting hyperbranched polyamides (HBPA) were investigated. When the polymerization of 1 was carried out with N-methyl core initiator 2b at various feed ratios of 1 to 2b ([1]0/[2b]0) in the presence of LiHMDS and LiCl at −10 °C, the Mn values of the obtained HBPA increased in proportion to the [1]0/[2b]0 ratio from 7 to 46 (Mn = 3810–18600), retaining a narrow molecular weight distribution (Mw/Mn = 1.11–1.19). The HBPA was soluble in water, and a 0.25 wt.−% aqueous solution of the HBPA exhibited a lower critical solution temperature (LCST). The cloud point was 21–23 °C, which is about 30 °C lower than that of the corresponding poly(m-benzamide) with the N-TEG unit.