Study on Alcoholysis of Ethylene-vinyl Acetate Copolymer Catalyzed by Alkaline Deep Eutectic Solvents

DING Xiao-yan; LI Xiao-pei; ZHANG Yong-jie; HU Yan-ming

doi:10.14028/j.cnki.1003-3726.2023.12.009

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Study on Alcoholysis of Ethylene-vinyl Acetate Copolymer Catalyzed by Alkaline Deep Eutectic Solvents

更新时间：2023-11-23

- Study on Alcoholysis of Ethylene-vinyl Acetate Copolymer Catalyzed by Alkaline Deep Eutectic Solvents
- Polymer Bulletin Vol. 36, Issue 12, Pages: 1691-1698(2023)
- 作者机构：
  
  1.大连工业大学纺织与材料工程学院，大连　116034
  2.中国科学院大连化学物理研究所，大连　116023
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2023.12.009
  CLC：
- Published：20 December 2023，
  
  Received：23 March 2023，
  
  Revised：16 April 2023，
扫描看全文
DING Xiao-yan, LI Xiao-pei, ZHANG Yong-jie, HU Yan-ming. Study on Alcoholysis of Ethylene-vinyl Acetate Copolymer Catalyzed by Alkaline Deep Eutectic Solvents. [J]. Polymer Bulletin 36(12):1691-1698(2023)
DOI：

DING Xiao-yan, LI Xiao-pei, ZHANG Yong-jie, HU Yan-ming. Study on Alcoholysis of Ethylene-vinyl Acetate Copolymer Catalyzed by Alkaline Deep Eutectic Solvents. [J]. Polymer Bulletin 36(12):1691-1698(2023) DOI： 10.14028/j.cnki.1003-3726.2023.12.009.

摘要

截至目前

工业化生产乙烯-乙烯醇共聚物(EVOH)主要通过乙烯-醋酸乙烯共聚物(EVA)的醇解反应。然而

EVOH 生产过程中伴随大量废水的产生

不可避免地会引起环境问题。本文合成了一系列的碱性深共晶溶剂

并将其用于催化醇解EVA。系统研究了深共晶溶剂结构与催化性能的关系

以及醇解反应参数、EVA结构组成和氮气流辅助对醇解效率的影响。研究表明

碱性越强的深共晶溶剂

EVA 的醇解效率越高。其中

8-二氮杂二环十一碳-7-烯/苯甲醇(DBU-BA)表现出了优异的催化活性

在极低的催化剂用量下

即可得到醇解度接近100%的EVOH 产物。此外

DBU-BA可以重复使用至少5次

催化活性没有明显降低

表现出优异的可重复使用性。基于核磁共振氢谱(

H-NMR)和傅里叶红外光谱(FTIR)分析

本文揭示了深共晶溶剂在EVA醇解体系中可能的催化机理。

Abstract

Industrial ethylene-vinyl alcohol copolymer (EVOH) is mainly prepared by alcoholysis of ethylenevinyl acetate copolymer (EVA) up to now. However

a large amount of wastewater will be produced during the preparation of EVOH

which inevitably results in a series of environmental problems. Herein

a series of alkaline deep eutectic solvents (DESs) were synthesized and used as eco-friendly catalysts for alcoholysis of EVA copolymer. The structure and catalytic performance relationship of DESs and the effects of the reaction parameters

EVA composition

and nitrogen flow on the alcoholysis were systematically investigated. The DESs with higher basicity were more efficient for the methanolysis of EVA

and among them

8-diazabicyclo[5.4.0]undec-7-ene/benzylalcohol (DBU-BA) exhibited excellent catalytic activity and afforded EVOH with nearly 100% of alcoholysis degree at very low catalyst loadings. Moreover

DBU-BA could be reused at least five times without the decrease of catalytic activity

showing excellent reusability. On the basis of proton nuclear magnetic resonance (

H-NMR) and Fourier transform infrared spectroscopy (FTIR) analyses

the plausible mechanism of DESs catalyzed alcoholysis of EVA was proposed.

关键词

乙烯-乙烯醇共聚物深共晶溶剂醇解催化可重复使用性

Keywords

Ethylene-vinyl alcohol copolymerDeep eutectic solventsAlcoholysisCatalysisReusability

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中国科学院大连化学物理研究所

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