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Gradient copolymers of ε‐caprolactone and δ‐valerolactone via solvent‐free ring‐opening copolymerization with a pyridyl‐urea/MTBD system
Journal of Polymer Science ( IF 3.4 ) Pub Date : 2020-07-09 , DOI: 10.1002/pol.20200174
Rui Feng 1 , Suyun Jie 1 , Pierre Braunstein 2 , Bo‐Geng Li 1
Affiliation  

The ring‐opening copolymerization of ε‐caprolactone and δ‐valerolactone was carried out under solvent‐free conditions with a pyridyl‐urea (6C‐PU)/7‐methyl‐1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene catalytic system by premixing two monomers, yielding gradient copolyesters with cyclic and linear structures in the absence or presence of an initiator, respectively. The random and block copolyesters of these two monomers were also prepared for comparison. The results of 1H and 13C NMR spectra determined the linear and cyclic structure of copolymers. The kinetic experiment was used to determine the consuming rates of two monomers during the polymerization. The topologies and thermal properties of all the copolymers were characterized and compared by NMR and DSC.

中文翻译:

ε-己内酯和δ-戊内酯的梯度共聚物,通过吡啶-脲/ MTBD系统进行无溶剂开环共聚

ε-己内酯和δ-戊内酯的开环共聚反应是在无溶剂条件下,使用吡啶基-脲(6C-PU)/ 7-甲基-1,5,7-三氮杂双环[4.4.0] dec-进行的通过预混合两种单体的5烯催化体系,分别在不存在引发剂的情况下产生具有环状和线性结构的梯度共聚酯。还制备了这两种单体的无规和嵌段共聚酯用于比较。的结果1 H和13 C NMR谱确定的共聚物的直链和环状结构。动力学实验用于确定聚合过程中两种单体的消耗速率。通过NMR和DSC表征并比较了所有共聚物的拓扑和热性能。
更新日期:2020-07-09
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