文献类型：期刊文献

英文题名：Effect of pre-curing process on epoxy resin foaming using carbon dioxide as blowing agent

作者：Lyu, Jiaxun[1];Liu, Tao[1];Xi, Zhenhao[2];Zhao, Ling[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai, Peoples R China

年份：2017

卷号：53

期号：2

起止页码：181

外文期刊名：JOURNAL OF CELLULAR PLASTICS

收录：;EI(收录号：20171803620719);WOS:【SCI-EXPANDED(收录号:WOS:000398130500004)】；

基金：The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the Research Fund for the Doctoral Program of Higher Education of China (grant no. 20120074120019); the Plan for Shanghai excellent technical leaders (14xd425500); the Fundamental Research Funds for the Central Universities; and the 111 Project (grant no. B08021).

语种：英文

外文关键词：Pre-curing; curing kinetics; thermoset foams; epoxy resin; carbon dioxide

摘要：A thermosetting epoxy resin system consisting of diglycidylether of bisphenol A (DGEBA) and m-xylylenediamine (MXDA) was successfully foamed by carbon dioxide (CO2) using two-step batch process. Isothermal curing kinetics of epoxy system was developed to help control the pre-curing degree of resin under different pre-curing conditions. Samples with different pre-curing degrees were prepared and then foamed via temperature-rising foaming process. It was found that the pre-curing degree was a crucial index for the foamability of epoxy resin. The effects of pre-curing conditions on curing reaction as well as further foaming results were investigated, and the results showed that the pre-curing degree from 37.7% to 46.3% was the proper foaming range for the chosen epoxy resin. With increasing pre-curing degrees from 37.7% to 51.6%, viscosity and elasticity of pre-cured resins increased, and correspondingly, average cell size of epoxy foams decreased from 329.8 mu m to 60.8 mu m while cell density increased from 1.4 x 10(5) cells/cm(3) to 8.6 x 10(5) cells/cm(3). Furthermore, the foamed samples with the same pre-curing degree had similar cell morphology regardless of pre-curing conditions.