文献类型：期刊文献

英文题名：Evaluation of the crosslinking reaction kinetics of cationic polyol dispersions with differential scanning calorimetry and dielectric analysis

作者：Wu, Guo-min[1,2,3,4] Kong, Zhen-wu[1,2,3,4] Chen, Cai-feng[1,2,3,4] Chen, Jian[1,2,3,4] Huo, Shu-ping[1,2,3,4] Jiang, Jian-chun[1,2,3,4]

第一作者：Wu, Guo-min;吴国民

通信作者：Kong, ZW[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]Key Lab Biomass Energy & Mat Jiangsu Prov, Nanjing 210042, Jiangsu, Peoples R China;[3]State Forestry Adm, Key & Open Lab Forest Chem Engn, Nanjing 210042, Jiangsu, Peoples R China;[4]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Jiangsu, Peoples R China

年份：2013

卷号：551

起止页码：118-123

外文期刊名：THERMOCHIMICA ACTA

收录：;EI(收录号：20130115868078);Scopus(收录号：2-s2.0-84870292659);WOS:【SCI-EXPANDED(收录号:WOS:000313541900019)】；

基金：The authors gratefully acknowledge the financial support from the Chinese National Natural Science Foundation (contract grant number: 30972320).

语种：英文

外文关键词：Kinetics; Polyurethane; Differential scanning calorimetry; Dielectric analysis

摘要：The crosslinking reaction kinetics of two-component waterborne polyurethanes (2K-WPUs) composed of cationic polyol dispersions and hydrophilically modified hexamethylene diisocyanate (HDI) tripolymer were investigated by differential scanning calorimetry (DSC) and dielectric analysis (DEA) techniques. DSC data fit for the 2K-WPUs was carried out with Malek's mechanism function method. The kinetic parameters and kinetic models of crosslinking reaction were determined by the kinetic analysis with Malek's method. The result showed that the crosslinking process of the reaction followed an autocatalytic reaction. Sestak-Berggren model (S-B model) could favorably describe the crosslinking reaction process of the studied 2K-WPUs. The reaction rate curves derived from the experimental data showed a good agreement with the theoretical calculation under 5-20 degrees C min(-1) heating rate. Isothermal DSC and DEA of the crosslinking process of the 2K-WPUs were used to confirm the obtained kinetics equations. The conversion-time curves from isothermal DSC matched favorably with the calculated curves from the obtained kinetic equations, and the log ion viscosity-time curves from isothermal DEA matched roughly with the conversion-time curves from DSC. (C) 2012 Elsevier B.V. All rights reserved.