摘要
利用动态 TGA方法研究了双酚 A二缩水甘油醚环氧树脂和酚醛环氧树脂与双酚 A二氰酸酯的两类共混物的热稳定性。用 Coats- Redfern研究了不同配比共混物的热分解动力学。结果表明 ,氰酸酯含量大的双酚 A二缩水甘油醚环氧树脂 /双酚 A二氰酸酯共混物具有两阶段分解机理 ,而环氧含量大的双酚 A二缩水甘油醚环氧树脂 /双酚 A二氰酸酯共混物具有均一的热分解活化能 ;相比较而言 ,酚醛环氧树脂 /双酚 A二氰酸酯共混物的分解活化能基本上不随温度和组成变化。从后期失重温度和活化能看 ,酚醛环氧树脂 /双酚 A二氰酸酯共混物具有比双酚 A二缩水甘油醚环氧树脂 /双酚 A二氰酸酯共混物更高的热稳定性。
The dynamic thermogravimetric analysis (TGA) of two kinds of cyanate/epoxy blends was performed. The effects of molar ratios of cyanate and epoxy on thermal stability were disclosed. The Coats-Redfern equation was used to compute the weight loss data and the activation energies of decomposition. It is found that the cyanate-rich blend containing bisphenol A diglycidyl ether has a two step decomposition process and the epoxy-rich blend has a single mechanism. The activation energy of thermal decomposition of the blend containing novolac epoxy, which is greater than that of the blend containing bisphenol A diglycidyl ether, and is independent of the temperature and the concentration of the epoxy, indicating much better thermal stability than that of the blend containing bisphenol A diglycidyl ether.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2002年第3期1-5,共5页
Acta Materiae Compositae Sinica
基金
广东省自然科学基金项目 (0 0 0 5 11)
关键词
共混物
氰酸酯
环氧树脂
热分解
动力学
热稳定性
改性
复合材料
Activation energy
Epoxy resins
Pyrolysis
Reaction kinetics
Thermodynamic stability
Thermogravimetric analysis
