高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (12): 2394.

• 研究简报 • 上一篇    

结晶度对微波作用下PET水解解聚的影响

刘立新1,3,刘若旺2,张东2,安立佳1,王禹3   

  1. 1.中国科学院长春应用化学研究所,长春130022;2.温州大学应用化学研究所,温州325027;
    3.大庆石油学院化学化工学院,大庆163318
  • 收稿日期:2005-01-07 出版日期:1905-03-14 发布日期:1905-03-14
  • 通讯作者: 张东(1958年出生),男,博士,教授,主要从事高分子材料化学研究.E-mail:dzhang@wznc.zj.cn
  • 基金资助:

    国家自然科学基金专项基金(批准号：20474043)资助.

Effects of Crystallinity on Hydrolytic Depolymerization of PET Under Microwave Irradiation

LIU Li-Xin1,3,LIU Ruo-Wang2,ZHANG Dong2*,AN Li-Jia1,WANG Yu3   

  1. 1.Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
    2.Institute of Applied Chemistry,Wenzhou University,Wenzhou 325027,China;
    3.School of Chemistry & Chemical Engineering,Daqing Petroleum Institute,Daqing 163318,China
  • Received:2005-01-07 Online:1905-03-14 Published:1905-03-14
  • Contact: ZHANG Dong;E-mail:dzhang@wznc.zj.cn

被引次数

13

摘要：

本文对微波作用下PET的中性水解解聚反应中原料结晶度的影响进行了研究.

关键词: 聚对苯二甲酸乙二醇酯(PET);微波辐射;DSC;结晶度;解聚率, 聚对苯二甲酸乙二醇酯(PET), 微波辐射, DSC, 结晶度, 解聚率

Abstract:

Polyethylene terephthalate(PET) resin was hydrolyzed to terephthalate acid(TPA) and ethylene glycol(EG) under microwave irradiation.The effects of crystallinity on the depolymerization of PET was investigated.PET resin was isothermal crystallized at temperature of 140,170,200 and 230℃ for 5 hours,the crystallinity of the resin was 25.7%,29.5%,33.9% and 40.6%,respectively,then the resin with different crystallinity was hydrolyzed under microwave irriadition. Under the same conditions of hydrolytic depolymerization,the degree of PET depolymerization decreased from 72.8% to 69.34% with the increase of crystallinity of PET resin,the rate of depolymerization varied little with the increasing of crystallinity of PET,this indicated that the crystallinity of PET has little effect on the hydrolytic depolymerization.The crystallinity of PET was increased during the temperature elevating process of the hydrolytic depolymerization.Investigation by DSC proved that the crystallinity of PET resin increased notability during the same temperature elevating process as the hydrolyzed depolymerization.According to the theory that depolymerization was firstly proceed in the amorphous phase,the crystallinity should increase during the reaction.However,the crystallinity of PET residue was decreased during all the reaction process,this indicates that the hydrolysis did  not preferentially occur in the amorphous phase.

Key words: Polyethylene terephthalate(PET);Microwave irradiation;DSC;Crystallinity;Depolymerization rate, Polyethylene terephthalate(PET), Microwave irradiation, DSC, Crystallinity, Depolymerization rate

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