CURING KINETICS OF A NEW BENZOXAZINE-BASED PHENOLIC RESIN BY DIFFERENTIAL SCANNING CALORIMETRY
CURING KINETICS OF A NEW BENZOXAZINE-BASED PHENOLIC RESIN BY DIFFERENTIAL SCANNING CALORIMETRY
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DOI：
10.1016/0032-3861(95)97878-j
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发表时间：
1995-08-01
期刊：
影响因子：
4.6
通讯作者：
RODRIGUEZ, Y
中科院分区：
文献类型：
--
作者：
ISHIDA, H;RODRIGUEZ, Y
研究了以双酚A和苯胺为原料的苯并恶嗪前体的固化反应，确定了将其加工成最终酚类制品的可行性。苯并恶嗪前驱体能够克服传统酚醛树脂的大部分缺点，同时又保留了酚醛树脂优良的耐热性和防火防烟性能。这种新型酚醛材料通过开环机制固化，不会产生任何缩合或其他反应副产物。不使用苯酚作为原料，这大大降低了环境和健康风险。根据差示扫描量热法（d.s.c），苯并恶嗪前体的固化是一个自催化反应，直到达到玻璃化，扩散开始控制固化过程。进行了等温和非等温dsc试验。通过各种程序计算活化能和总反应级数。同时计算了玻璃化时间和动力学速率常数。
The curing reactions of benzoxazine precursors based on bisphenol A and aniline are studied to determine the feasibility of processing them into final phenolic parts. Benzoxazine precursors are able to overcome most of the shortcomings of traditional phenolic resins, and retain the excellent heat resistance and fire and smoke properties of these resins. This new type of phenolic material cures via a ring-opening mechanism that does not produce any condensation or other reaction by-products. Phenol is not used as raw material, which reduces considerably the environmental and health risks. According to differential scanning calorimetry (d.s.c.), the curing of benzoxazine precursors is an autocatalysed reaction until vitrification is reached, and diffusion begins to control the curing process afterwards. Isothermal and non-isothermal d.s.c. tests are performed. Calculations of the activation energy and the overall reaction order are made by various procedures. The vitrification times and the kinetic rate constants are also calculated.