物理化学学报 >> 2007, Vol. 23 >> Issue (10): 1622-1626.doi: 10.3866/PKU.WHXB20071025

研究简报 上一篇    下一篇

聚氨酯胶粘剂的热分解动力学研究

李爱玲; 熊金平; 左禹; 王成忠   

  1. 北京化工大学材料科学与工程学院, 北京 100029
  • 收稿日期:2007-03-08 修回日期:2007-06-12 发布日期:2007-10-01
  • 通讯作者: 熊金平 E-mail:xiongjp@mail.buct.edu.cn

Thermal Decomposition Kinetics of Polyurethane Adhesive

LI Ai-Ling; XIONG Jin-Ping; ZUO Yu. WANG Cheng-Zhong   

  1. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2007-03-08 Revised:2007-06-12 Published:2007-10-01
  • Contact: XIONG Jin-Ping E-mail:xiongjp@mail.buct.edu.cn

摘要: 采用热分析技术考察了通用型聚氨酯胶粘剂在空气中的热解过程, 并通过TG方法和动力学方法研究了各步反应的活化能E、指前因子A等动力学参数. 通过等失重转化率法校验了两种方法所获得的EA值. 结果表明, 聚氨酯胶粘剂有三个主要降解阶段, 第一降解阶段的活化能为144.31-148.35 kJ·mol-1, 第二个降解阶段的活化能为196.96-204.26 kJ·mol-1, 第三个降解阶段的活化能为202.97-205.27 kJ·mol-1; 热降解过程为一级反应, 随着失重百分率的增大, 热分解反应活化能增大. 此外, 聚氨酯胶粘剂具有较高的热稳定性, 预测其在35 ℃的空气中失重5%时的热老化寿命为10年.

关键词: 聚氨酯胶粘剂, 热分解, 寿命预测

Abstract:

The thermal behavior of polyurethane adhesive in air atmosphere was investigated by thermogravimetry (TG) and derivative thermogravimetry (DTG). The kinetic parameters were evaluated by TG method and dynamic method, and the isoconversional method was employed to verify the values. The results showed that there were three main decomposition stages in the DTG curves. The apparent activation energy values determined using the TG method were 144.31-148.35 kJ·mol-1 for the first stage of decomposition, 196.96-204.26 kJ·mol-1 for the second stage and 202.97-205.27 kJ·mol -1 for the third stage. The non-isothermal degradation was found to be first order reaction, and the activation energy increased with the increase of mass loss. The lifetime estimate indicated the maximum lifetime of polyurethane under 35 ℃in air to be 10 years . The kinetic data suggested that polyurethane adhesive had excellent thermal stability.

Key words: Polyurethane adhesive, Decomposition, Lifetime estimate

MSC2000: 

  • O648