Periodic ethylene-vinyl alcohol copolymers via ADMET polymerization: Synthesis, characterization, and thermal property
作者:Zi-Long Li、An Lv、Lei Li、Xin-Xing Deng、Li-Jing Zhang、Fu-Sheng Du、Zi-Chen Li
DOI:10.1016/j.polymer.2013.05.037
日期:2013.7
content via ADMET. These polymer samples were characterized by gel permeation chromatography (GPC), NMR, and matrix-assisted laser desorption/ionization time-of-fight mass spectroscopy (MALDI-TOF-MS). Thermal properties of EVAc and EVA copolymers were investigated by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). EVAc copolymers exhibited two-stage decompositions on
通过一系列包含两个乙酸乙烯酯(VAc)单元的结构对称的α,ω-二烯单体的无环二烯复分解(ADMET)聚合反应,合成乙烯和乙烯醇(EVA)的周期性共聚物,然后进行彻底氢化和随后的水解。这种合成方法通过ADMET提供了一种新型的EVA共聚物,该共聚物具有明确的序列和前所未有的VA含量。这些聚合物样品通过凝胶渗透色谱(GPC),NMR和基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF-MS)进行表征。通过热重分析(TGA)和差示扫描量热法(DSC)研究了EVAc和EVA共聚物的热性能。EVAc共聚物在TGA迹线上表现出两阶段分解,并在DSC热谱图上表现出玻璃化转变。同时,EVA共聚物在DSC温度谱图上显示出玻璃化转变阶段和急剧的熔融峰,且T m值可与高密度聚乙烯(HDPE)相比。