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浙江大学学报(工学版)
J4  2011, Vol. 45 Issue (5): 914-918    DOI: 10.3785/j.issn.1008-973X.2011.05.023
    
Kinetics of non-catalyzed hydrolysis of polyvinyl acetate
in near-critical water
ZHANG Jian-fei, LIU Ti-feng, LV Xiu-yang
Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  

In order to develop a green technology of polyvinyl acetate(PVAC) hydrolysis,kinetics of non–catalyzed hydrolysis of PVAC in near-critical water was investigated.After examining the repeatability of experiment data,the non-catalyzed hydrolysis kinetics of PVAC in near-critical water was systematically studied at 230-270 ℃. The hydrolysis products were characterized by IR, TG and GPC. The results reveal that non-catalyzed hydrolysis of PVAC in near-critical water is feasible, and is a typical self-catalyzed reaction. Higher temperature accelerates hydrolysis, but speeds up the polymer degradation, too. With a second-order kinetics equation, the activation energy evaluated for PVAC hydrolysis in near-critical water is 51.93 kJ/mol.

Published: 24 November 2011
CLC:  TQ 031.15  
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Cite this article:

ZHANG Jian-fei, LIU Ti-feng, LV Xiu-yang. Kinetics of non-catalyzed hydrolysis of polyvinyl acetate
in near-critical water. J4, 2011, 45(5): 914-918.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2011.05.023     OR     https://www.zjujournals.com/eng/Y2011/V45/I5/914


近临界水中聚醋酸乙烯酯无催化水解动力学

为了开发聚醋酸乙烯酯的绿色水解改性工艺,对近临界水中聚醋酸乙烯酯(PVAC)的无催化水解反应动力学进行研究.在实验数据重现性考查基础上,系统地测定聚醋酸乙烯酯在230～270 ℃反应温度下的水解反应动力学数据,并对其水解产物进行红外色谱(IR),热重分析(TG)以及凝胶色谱(GPC)表征.结果表明,聚醋酸乙烯酯在近临界水中能够进行水解,且该反应为典型的自催化反应,温度的升高可以提高反应速率,但同时也加剧PVAC的降解行为.以二级动力学模型对实验结果进行拟合,得到聚醋酸乙烯酯在近临界水中的水解反应活化能为51.93 kJ/mol.

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