Binary catalytic system for homo- and block copolymerization of ε-caprolactone with δ-valerolactone,RSC Advances

当前位置： X-MOL 学术 › RSC Adv. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Binary catalytic system for homo- and block copolymerization of ε-caprolactone with δ-valerolactone
RSC Advances ( IF 3.9 ) Pub Date : 2020-7-9 , DOI: 10.1039/d0ra04974c
Yan Wang ₁ , Yongle Han ₂ , Lifang Zhang _{1,

2,

3}

Affiliation

The combined interaction of 2,3,6,7-tetrahydro-5H-thiazolo[3,2-a] pyrimidine (ITU) as the organocatalytic nucleophile with YCl₃ as Lewis acid cocatalyst, generating ITU/YCl₃, was employed for homo- and copolymerization of ε-caprolactone (CL) with δ-valerolactone (VL). Poly(caprolactone) (PCL) and poly(caprolactone)–poly(ethylene glycol)–poly(caprolactone) (PCL–PEG–PCL) triblock copolymer and poly(valerolactone)–poly(caprolactone)–poly(ethylene glycol)–poly(caprolactone)–poly(valerolactone) (PVL–PCL–PEG–PCL–PVL) pentablock copolymer were successfully prepared by ring-opening polymerization (ROP) of CL employing ITU/YCl₃ as catalyst in the presence of benzyl alcohol (BnOH) or poly(ethylene glycol) (PEG) as initiator, respectively. The reaction was systematically optimized, and the architecture, molecular weight and thermal properties of the polymers were characterized by NMR, FTIR, SEC and DSC analyses. Finally, a plausible polymerization mechanism was proposed.

中文翻译：

ε-己内酯与δ-戊内酯均聚和嵌段共聚的二元催化体系

2,3,6,7-四氢-5 H-噻唑并[3,2 - a ]嘧啶（ITU）作为有机催化亲核试剂与YCl ₃作为路易斯酸助催化剂的组合相互作用，产生ITU /YCl ₃，用于ε-己内酯 (CL) 与 δ-戊内酯 (VL) 的均聚和共聚。聚（己内酯）（PCL）和聚（己内酯）-聚（乙二醇）-聚（己内酯）（PCL-PEG-PCL）三嵌段共聚物和聚（戊内酯）-聚（己内酯）-聚（乙二醇）-聚(己内酯)-聚(戊内酯)(PVL-PCL-PEG-PCL-PVL)五嵌段共聚物采用ITU /YCl ₃ CL开环聚合(ROP)成功制备在苯甲醇（BnOH）或聚（乙二醇）（PEG）分别作为引发剂的情况下作为催化剂。系统地优化了反应，并通过NMR、FTIR、SEC和DSC分析表征了聚合物的结构、分子量和热性能。最后，提出了一种合理的聚合机理。

更新日期：2020-07-09

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11