摘要
首次使用400MHz 高分辨氢核磁共振方法,依据 PHB/PET/VA 三元共聚酯的序列分布,较详细研究了 PHB/PET/VA(A/B/C)三元共缩聚反应机理,获得了一系列重要的单体竞聚率。竞聚率值表明,单体 VA(香草酸)易于均聚,而单体 PHB(对乙酰氧基苯甲酸)和单体 PET(聚对苯二甲酸乙二酯链节)都易于与单体 VA 共缩聚。
PHB/PET/VA(A/B/C)copolycondensation reaction mechanisms a- re first studied according to the sequence distributions of PHB/PET/ VA terpolyesters by high-resolution ~1H-NMR method at 400MHz.A s- eries of reactivity ratios of PHB/PET/VA copolycondensation reactio- ns are proposed.The results show that monomer VA(Vanillic Acid) is inclined to homopolymerize,but that monomer PHB(p-Hydroxy benzoic Acid)and monomer PET(Polyethylene Terephthalate)are both inclined to copolymerize with monomer VA.
出处
《天津纺织工学院学报》
北大核心
1989年第3期38-47,共10页
Journal of the Tianjin Institute of Textile Science and Technology
关键词
液晶三元共聚酯
共缩聚
反应机理
high-resolution ~1H-NMR
liquid crystalline terpolyester
sequence distribution
copolycondensation reaction mechanism
reactivity ratio
