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首页> 外文期刊>Journal of Applied Polymer Science >Polymerization mechanisms and curing kinetics of novel polumercaptan curing system containing epoxyitrogen
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Polymerization mechanisms and curing kinetics of novel polumercaptan curing system containing epoxyitrogen

机译：新型含环氧/氮的po硫醇固化体系的聚合机理和固化动力学

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摘要

The bis[3-(2,3-epoxypropylthio)phenyl]-sulfone (BEPTPhS)/trimercaptothioethylamine (TMTEA) system has a self-catalytic effect and can cure without any other accelerator. The curing kinetics of the BEPTPhS/TMTEA system was studied by means of the dynamic and isothermal differential scanning calorimetry method. The dynamic kinetic parameters were calculated with the aid of the Kissinger and Ozawa methods. The kinetic reaction mechanism in the isothermal reaction of BEPTPhS/TMTEA was shown to follow autocatalytic kinetics. The isothermal kinetic parameters, including k(1), k(2), m, and n, from the model proposed by Kamal were determined by fitting the experimental data; a good description of the curing kinetics was obtained, although deviations were observed at low conversions. The Arrhenius kinetic analysis indicated that the activation energy decreased with the increase of the reaction conversion, which indicated a change of the reaction mechanism. The isothermal kinetic analysis and Arrhenius kinetic analysis both demonstrated that the catalytic effect of the nitrogen atom in TMTEA predominated at low conversions and the autocatalytic effect predominated at high conversions. (C) 2002 Wiley Periodicals, Inc. [References: 21]
机译：双[3-（2,3-环氧丙硫基）苯基]砜（BEPTPhS）/三巯基硫代乙胺（TMTEA）系统具有自催化作用，无需任何其他促进剂即可固化。利用动态等温差示扫描量热法研究了BEPTPhS / TMTEA体系的固化动力学。动态动力学参数借助于基辛格和小泽方法进行计算。 BEPTPhS / TMTEA等温反应中的动力学反应机理表明遵循自催化动力学。通过拟合实验数据确定了由Kamal提出的模型的等温动力学参数，包括k（1），k（2），m和n。尽管在低转化率下观察到偏差，但是获得了对固化动力学的良好描述。 Arrhenius动力学分析表明，活化能随反应转化率的增加而降低，表明反应机理发生了变化。等温动力学分析和阿累尼乌斯动力学分析均表明，TMTEA中氮原子的催化作用在低转化率下占主导地位，自催化作用在高转化率下占优势。 （C）2002 Wiley Periodicals，Inc. [参考：21]

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