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An optimized preparation of bismaleimide-diamine co-polymer matrices

机译：双马来酰亚胺-二胺共聚物基质的优化制备

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The main aim of this study was to develop an improved method for the preparation of a bismaleimide-diamine (BMI/DDM) polymer matrix, achieving shorter curing time, longer processing time (pot life), and good thermal mechanical properties. A matrix of BMI/DDM thermoset was prepared at optimal conditions and formulation, containing BMI and DDM in a 2:1 mol ratio with 0.1 wt% of dicumyl peroxide (DCP) as the curing accelerator. An optimal temperature of 150℃ was selected for both melt-mixing and curing processes. The mechanism of matrix preparation was also investigated using differential scanning calorimetry and quantitative Fourier transformed infrared analysis. DCP at the optimal concentration was found to accelerate cross-linking reactions between BMI and DDM without inhibiting the chain-extension reaction of BMI. The specified formulation exhibited longer gel time (208 s/g) and shorter postcuring time (2 h) compared to other formulations. In addition, thermomechanical behavior and thermal stability were analyzed by dynamic mechanical analysis and thermomechanical analysis, and thermogravimetric analysis, respectively. The storage modulus (E'), glass transition temperature (T_g), and decomposition temperature (T_d) of the BMI/ DDM thermosets increased with the BMI content of the formulations, while the coefficient of thermal expansion and damping behavior (tanδ) decreased in a similar manner, primarily because of an increase in the degree of crosslinking.
机译：这项研究的主要目的是开发一种改进的方法来制备双马来酰亚胺-二胺（BMI / DDM）聚合物基质，从而缩短固化时间，延长加工时间（适用期）并具有良好的热机械性能。在最佳条件和配方下制备了BMI / DDM热固性基质，该基质含有2：1摩尔比的BMI和DDM，其中0.1 wt％的过氧化二枯基（DCP）作为固化促进剂。熔融混合和固化过程均选择最佳温度150℃。还使用差示扫描量热法和定量傅立叶变换红外分析法研究了基质制备的机理。发现最佳浓度的DCP可加速BMI与DDM之间的交联反应，而不会抑制BMI的链延长反应。与其他配方相比，指定的配方表现出更长的凝胶时间（208 s / g）和更短的后固化时间（2 h）。此外，分别通过动态力学分析，热力学分析和热重分析来分析热力学行为和热稳定性。 BMI / DDM热固性材料的储能模量（E'），玻璃化转变温度（T_g）和分解温度（T_d）随着配方中BMI含量的增加而增加，而热膨胀系数和阻尼行为（tanδ）则降低。相似的方式，主要是由于交联度的增加。

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