Journal
JOURNAL OF CELLULAR PLASTICS
Volume 53, Issue 2, Pages 181-197Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021955X16639235
Keywords
Pre-curing; curing kinetics; thermoset foams; epoxy resin; carbon dioxide
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Funding
- Research Fund for the Doctoral Program of Higher Education of China [20120074120019]
- Plan for Shanghai excellent technical leaders [14xd425500]
- Fundamental Research Funds for the Central Universities
- 111 Project [B08021]
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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.
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