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首页> 外文期刊>Journal of Applied Polymer Science >Effect of chlorine substitution in 4,4 '-diaminodiphenylmethane hardener on shelf life and mechanical properties of epoxies
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Effect of chlorine substitution in 4,4 '-diaminodiphenylmethane hardener on shelf life and mechanical properties of epoxies

机译：4,4'-二氨基二苯基甲烷硬化剂中氯取代对环氧树脂的货架期和力学性能的影响

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摘要

Curing of N,N,N',N'-tetraglycidyldiaminodiphenylmethane with new curing agents like 3,3'-dichloro-4,4'-diaminodiphenylmethane and 2,2'-dichloro-4,4'-diaminodiphenylmethane in comparison with diaminodiphenylmethane and 4,4'-diaminodiphenylsulphone (DDS) was carried out using dynamic differential scanning calorimetry. The shelf life of various epoxy formulations was evaluated by the residual cure exotherm method. The glass-transition temperatures of cured epoxy formulations were determined using dynamic mechanical analysis. The mechanical properties such as the tensile strength, tensile modulus, flexural strength, and Izod impact strength were also evaluated and compared. The activation energy, frequency factor, and shelf life of chloro-substituted hardener formulations were high as compared to those of unsubstituted hardener formulations. The marginal differences in the glass-transition temperature, tensile strength, tensile modulus, and flexural strength and the small decrement in the Izod impact strength values were interpreted in terms of chlorine substitution. (C) 2002 John Wiley Sons, Inc. [References: 9]
机译：与新的固化剂相比，用3,3'-dichloro-4,4'-diaminodiphenylmethane和2,2'-dichloro-4,4'-diaminodiphenylmethane与新的固化剂对N，N，N'，N'-四缩水甘油基二氨基二苯基甲烷进行固化，与二氨基二苯基甲烷和使用动态差示扫描量热法进行4，4′-二氨基二苯砜（DDS）。通过残留固化放热法评估了各种环氧配方的保质期。使用动态力学分析确定固化的环氧配方的玻璃化转变温度。还评估并比较了机械性能，如拉伸强度，拉伸模量，弯曲强度和艾佐德冲击强度。与未取代的硬化剂配方相比，氯取代的硬化剂配方的活化能，频率因数和保质期高。玻璃化转变温度，拉伸强度，拉伸模量和挠曲强度的边际差异以及悬臂梁式冲击强度值的小幅下降都用氯取代来解释。 （C）2002 John Wiley Sons，Inc. [参考：9]

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