摘要： 采用一步法，以季戊四醇(B4单体)为核，2，2-二羟甲基丙酸(AB2单体)为单体，钛酸正丁酯为催化剂，合成了 Boltorn型超支化(Hyp-DMPA)。采用 FT-IR、NMR和化学滴定等方法对产物进行了表征和分析，并研究了超支化聚酯的缩聚反应动力学。以 IR、1H-NMR证实了聚酯结构的存在，13C-NMR谱图上 3种季碳的特征峰有力证实了超支化分子结构的存在，MALDI-TOFMS证明了超支化聚酯的成功合成，并计算超支化聚酯的支化度为 0.408;探讨并建立了超支化聚酯的缩聚反应动力学方程 -d[—COOH]/dt=K[—COOH][—OH]，该缩聚反应属于二级反应，反应速率由羧基浓度和羟基浓度共同决定。

关键词: 超支化聚酯, 缩聚, 反应动力学

Abstract: An one-pot synthesis of Boltom-type hyperbranched polyester based on pentaerythritol(B₄) as a core molecule and 2, 2-dimethylolpropionic acid(AB₂) as monomer, and tetrabutyl titanate as catalysis,was described. The structure were characterized by FT-IR, NMR and chemical titrimetry. The reaction kinetics of condensation polymerization hyperbranched polyester has also been studied. The results of FT-IR,¹ H-NMR indicate the structure of polyester, and the analysis of three quatemary carbon showed the existing of hyperbranced structure, MALDI-TOF MS showed the hyperbranched polyester structure, the degre of branching of the polyesters determined by C-NMR being 0. 408. The esterification reaction kinetics followed a second-order equation and the reaction rate was controled by the concerntration of carboxyl group and hydroxyl group, -d[-CooHJ/dt= K[-COOH] [-OH].

Key words: hyperbranched polyester, condensation, reaction kinetics