超支化聚(胺酯)的分子设计及其制备

SYNTHESIS AND CHARATERIZATION OF HYPERBRANCHED POLY(AMINE-ESTER)

以丙烯酸甲酯和二乙醇胺为原料由Michael加成反应制得N ,N 二羟乙基 3 胺基丙酸甲酯单体 ,再用“准一步法”和“发散法”使之与 1 ,1 ,1 三羟甲基丙烷 (核 )反应合成一种新型超支化聚 (胺 酯 ) .以核磁共振和元素分析方法对N ,N 二羟乙基 3 胺基丙酸甲酯单体的分子结构进行了表征 .GPC测定表明合成的超支化聚 (胺 酯 )分子量分布窄 ,具有单分散性 ;粘度小于同分子量的线形分子 ;耐热性能较好 ,失重温度高于2 0 0℃ .

The so\|termed hyperbranched polymers differ from classical polymers by their high degree of branching, high density of terminal functionality, and three\|dimensional molecular structure. The divergent synthesis of a series of polydisperse hyperbranched poly(amine\|ester)s based upon 1,1,1 \|trimethylolpropane (as a core molecule) and N,N \|diethylol\|3\|amine methylpropionate (as an AB\-2 monomer) synthesized via Michael addition of methyl acrylate and diethanolamine is described, proceeding in a stepwise growth manner starting from an “initiator core” building branched arms, i.e., pseudo\|one\|step manner, or a one\|step procedure in the melt using P\|TSA as catalyst. These materials have different numbers of hydroxyl groups at the chain extremities on each molecule. The molecular composition of hyperbranched poly(amine\|ester) was characterized by GPC, NMR and element analysis. The hyperbranched poly(amine\|ester)s prepared using the pseudo\|one\|step procedure have narrower molecular weight distributions than the products obtained by using one\|spot procedure as detected by GPC. The rheological behavior of the hyperbranched poly(amine\|ester)s was investigated using a spinning viscometer.The viscosity is reduced sharply as the temperature increases. The thermal property has been also estimated. The hyperbranched poly(amine\|ester)s, synthesized in this study, may be modified to meet particular application requirements for coating, lamination, and adhesive systems.