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首先采用二乙醇胺(DEA)与丙烯酸甲酯(MA)反应得到AB2型单体N,N-二羟乙基-3-氨基丙酸甲酯;然后以三羟甲基丙烷为核,在对甲苯磺酸的催化下,与N,N-二羟乙基-3-氨基丙酸甲酯反应得到端羟基超支化聚合物(HPAE-OH);最后采用顺丁烯二酸酐对端羟基超支化聚合物进行端基改性,制得端羧基超支化聚合物(HPAE-C)。优化的一代端羧基超支化聚合物的合成条件为:催化剂质量分数0.7%(基于反应物料总质量),反应投料比n(OH)∶n(马来酸酐)=1∶1.1,反应时间4 h,反应温度80℃。采用IR、1HNMR和13CNMR对端羧基超支化聚合物的分子结构进行了表征,采用表面张力仪研究了聚合物的表面活性。
First, AB2 monomer methyl N, N-dihydroxyethyl-3-aminopropionate was obtained by the reaction of diethanolamine (DEA) and methyl acrylate (MA) Sulfonic acid catalyzed reaction with methyl N, N-dihydroxyethyl-3-aminopropionate to obtain hydroxyl terminated hyperbranched polymer (HPAE-OH). Finally, maleic anhydride was used to react with terminal hydroxyl hyperbranched polymer The end group was modified to obtain an end carboxyl hyperbranched polymer (HPAE-C). The optimum conditions for the synthesis of the terminal carboxyl hyperbranched polymers were: catalyst mass fraction 0.7% (based on the total mass of the reaction mass), reaction feed ratio n (OH): n (maleic anhydride) = 1: 1.1, reaction time 4 h , The reaction temperature is 80 ℃. The molecular structure of the terminal carboxyl hyperbranched polymer was characterized by IR, 1HNMR and 13CNMR. The surface tension of the polymer was investigated by surface tensiometer.