標題: | The kinetics of B-a and P-a type copolybenzoxazine via the ring opening process |
作者: | Su, YC Yei, DR Chang, FC 應用化學系 Department of Applied Chemistry |
關鍵字: | benzoxazine;heterocyclic;ring opening;kinetics;activation energy |
公開日期: | 5-二月-2005 |
摘要: | The structure of benzoxazines is similar to that of phenolic resin through thermal self-curing of the heterocyclic ring opening reaction that neither requires catalyst nor releases any condensation byproduct. These polybenzoxazine resins have several outstanding properties such as high thermal stability and high glass transition temperature. To better understand the curing kinetics of this copolybenzoxazine thermosetting resin, dynamic and isothermal differential scanning calorimetry measurements were performed. Three models, the Kissinger method, the Flynn-Wall-Osawa method, and the Kamal method, were used to describe the curing process. Dynamic kinetic activation energies based on Kissinger and Flynn-Wall-Osawa methods are 72.11 and 84.06 KJ/mol, respectively. The Kamal method based on an autocatalytic model results in a total order of reaction between 2.66 and 3.03, depending on curing temperature. Its activation energy and Arrhenius preexponential are 50.3 KJ/mol and 7959, respectively. (C) 2004 Wiley Periodicals, Inc. |
URI: | http://dx.doi.org/10.1002/app.21244 http://hdl.handle.net/11536/14009 |
ISSN: | 0021-8995 |
DOI: | 10.1002/app.21244 |
期刊: | JOURNAL OF APPLIED POLYMER SCIENCE |
Volume: | 95 |
Issue: | 3 |
起始頁: | 730 |
結束頁: | 737 |
顯示於類別: | 期刊論文 |