Abstract:

A well-defined hydroxyl terminated poly(2-ethylhexyl acrylate) was prepared by atom transfer radical polymerization (ATRP) of 2-ethylhexyl acrylate, followed by the nucleophilic substitution of the bromo end group with N-methylethanolamine.Poly(2-ethylhexyl acrylate-urethane) was then synthesized by reacting the hydroxyl terminated poly(2-ethylhexyl acrylate) with toluene diisocyanate (TDI).The polymers were characterized by nuclear magnetic resonance (¹H NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and thermogravimetric analysis(TGA).The results showed that a hydroxyl terminated poly(2-ethylhexyl acrylate) with M_n of 2000 and OH functionality of about 1.80 was synthesized by ATRP.The glass transition temperature (T_g) of the hydroxyl terminated poly(2-ethylhexyl acrylate) was about -62℃, which was slightly higher than that of 2-ethylhexyl acrylate homopolymer.The decomposition temperature of the hydroxyl terminated poly(2-ethylhexyl acrylate) was around 409℃.Poly(2-ethylhexyl acrylate-urethane) with M_n of about 10200 was prepared by reacting hydroxyl terminated poly(2-ethylhexyl acrylate) with toluene diisocyanate (TDI), which had a glass transition temperature (T_g) of about -54℃.

Key words:

原子转移自由基聚合, 端羟基聚丙烯酸异辛酯, 聚丙烯酸异辛酯-氨酯

摘要：

采用原子转移自由基聚合（ATRP）合成了分子量与设计分子量（2000）大小相符的聚丙烯酸异辛酯，再以N-甲基单乙醇胺作为亲核试剂，对活性端基溴进行亲核取代，得到了分子量可控、分子量分布较窄的线型端羟基聚丙烯酸异辛酯。以此为原料与甲苯二异氰酸酯（TDI）反应，制备得到了聚丙烯酸异辛酯-氨酯。利用核磁共振谱（¹H NMR）、差示扫描量热仪（DSC）、热重示差扫描量热仪（TGA）对合成的端羟基聚丙烯酸异辛酯及聚丙烯酸酯异辛酯-氨酯的结构、热稳定性等进行了表征。结果表明，利用端羟基聚丙烯酸异辛酯成功地制备了聚丙烯酸异辛酯-氨酯，由凝胶渗透色谱仪（GPC）测得其分子量为10200，玻璃化转变温度为-54℃，是一种新型的丙烯酸酯与聚氨酯的共聚物。

关键词:

原子转移自由基聚合, 端羟基聚丙烯酸异辛酯, 聚丙烯酸异辛酯-氨酯