Hydrolysis Behavior and Thermal Stability of PVAc and EVA

Yin HU; Zhi-qun CHEN; Hai CHANG; Qing PAN; Ming WANG; Chun-yan REN

doi:10.14028/j.cnki.1003-3726.2015.12.011

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Hydrolysis Behavior and Thermal Stability of PVAc and EVA

更新时间：2022-09-18

- Hydrolysis Behavior and Thermal Stability of PVAc and EVA
- Polymer Bulletin Vol. 28, Issue 12, Pages: 92-97(2015)
- 作者机构：
  
  西安近代化学研究所，西安　710065
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2015.12.011
  CLC：
- Published：2015-12，
  
  Received：10 March 2015，
  
  Revised：28 April 2015，
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Yin HU, Zhi-qun CHEN, Hai CHANG, Qing PAN, Ming WANG, Chun-yan REN. Hydrolysis Behavior and Thermal Stability of PVAc and EVA. [J]. Polymer Bulletin 28(12):92-97(2015)
DOI：

Yin HU, Zhi-qun CHEN, Hai CHANG, Qing PAN, Ming WANG, Chun-yan REN. Hydrolysis Behavior and Thermal Stability of PVAc and EVA. [J]. Polymer Bulletin 28(12):92-97(2015) DOI： 10.14028/j.cnki.1003-3726.2015.12.011.

摘要

采用加速热水解、化学滴定法、红外光谱法、热重以及差示扫描量热法对比研究了聚醋酸乙烯酯(PVAc)和乙烯-醋酸乙烯酯共聚物(EVA)的水解动力学和热稳定性。结果表明:PVAc的水解速率是EVA的25~30倍

这是由于EVA分子结构中乙烯链的引入降低了酯基密度

与酯基相邻的双键的空间保护作用

使得EVA获得良好的水解稳定性

同时

也大大增加了分子结构的稳定性。PVAc粘结剂在长贮过程中容易发生降解

而EVA粘结剂可显著改善弹药的长贮失效。

Abstract

s:Hydrolysis kinetics and thermal stability of Ethylene-vinyl acetate copolymers(EVA) and Polyvinyl acetate(PVAc) have been studied comparatively. by using thermal hydrolysis

chemical titration

infrared spectrum

thermogravimetry analysis and Differential scanning calorimetry(DSC). The result shows that the hydrolysis rates of PVAc is about 25~30 times faster than EVA

it is due to the introduction of vinyl chain in the molecular structure of EVA reduces the acetoxy density

and space effect of double bond adjacent to the acetoxy group

making EVA get good hydrolysis stability. At the same time

greatly increasing the thermal stability of the molecular structure. Therefore

PVAc is peculiarly prone to degraded during the long storage process. However

EVA could dramatically improve the long term storage failure of the cartridge.

关键词

红外光谱热重差示扫描量热聚醋酸乙烯酯乙烯-醋酸乙烯酯共聚物水解

Keywords

IR spectrumThermogravimetryDifferential scanning calorimetryPolyvinyl acetateEthylene-vinyl acetate copolymersHydrolysis

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Related Institution

The Ningbo Institute of Material Technology and Engineering

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Engineering Plastics (KLEP), Institute of Chemistry, Chinese Academy of Sciences (CAS)

State Key Laboratory of Chemical Engineering,Polymer Reaction Engineering Division Department of Chemical and Biochemical Engineering,Zhejiang University

Zhejiang Xin’an Chemical Industry Group Co.LTD

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