Morphology, thermal and mechanical performance of epoxy/polysulfone composites improved by curing with two different aromatic diamines,Journal of Applied Polymer Science

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Morphology, thermal and mechanical performance of epoxy/polysulfone composites improved by curing with two different aromatic diamines
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-03-26 , DOI: 10.1002/app.49265
Qiuhui Ling ₁ , Dongyue Wang ₁ , Yan Zhang ₁ , Xueting Lu ₁ , Songmei Zhao ₂ , Fangli Sun ₁

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Epoxy/polysufone (PSF) composites cured with 4,4'‐diaminodiphenyl sulfone (DDS) and 4,4'‐diaminodiphenyl methane (DDM) were fabricated, and the effect of dual curing reaction of diamines with epoxy on morphology, mechanical, and thermal performance was investigated. DSC results indicated that DDM was more reactive than DDS and the activation energy decreased with the rising of DDM content. Structures with small domain size at the early stage of phase separation were fixed by the fast epoxy‐DDM reaction. When the DDM content was elevated to a high level, large dual structures were changed to fine bicontinuous structures, which was favorable to improve the mechanical property. The mechanical performance of epoxy composites was enhanced and the maximum values were achieved when the DDM/DDS ratio was located at 75/25 (PSF/DDS0.25‐DDM0.75). The flexural and tensile strength relative to epoxy/DDM system were enhanced more than those relative to epoxy/DDS, while the increase in toughness was the opposite. TGA measurement showed that thermal stability of epoxy/PSF composites was improved because of the restricting effect of continuous PSF domains on thermal motion of epoxy. DMA analysis exhibited two relaxation peaks for PSF/DDS0.25‐DDM0.75, which could be attributed to the formation of phase separated morphology and epoxy network with different cross‐link density.

中文翻译：

通过使用两种不同的芳族二胺固化可改善环氧/聚砜复合材料的形貌，热性能和机械性能

制备了用4,4'-二氨基二苯砜（DDS）和4,4'-二氨基二苯甲烷（DDM）固化的环氧/聚砜（PSF）复合材料，并且二胺与环氧树脂的双重固化反应对形貌，机械性能和研究了热性能。DSC结果表明，DDM比DDS具有更高的反应性，且活化能随DDM含量的增加而降低。快速的环氧-DDM反应可固定相分离初期具有小畴尺寸的结构。当DDM含量提高到高水平时，大的双重结构变为精细的双连续结构，这有利于改善机械性能。当DDM / DDS比率位于75/25（PSF / DDS0.25-DDM0.75）时，环氧复合材料的机械性能得到增强，并达到最大值。相对于环氧/ DDM系统，其抗弯强度和拉伸强度比相对于环氧/ DDS系统的抗弯强度和拉伸强度得到了更大的增强，而韧性的提高却相反。TGA测量表明，由于连续PSF域对环氧树脂热运动的限制作用，提高了环氧树脂/ PSF复合材料的热稳定性。DMA分析显示PSF / DDS0.25-DDM0.75有两个弛豫峰，这可能归因于相分离形态的形成以及具有不同交联密度的环氧网络。TGA测量表明，由于连续PSF域对环氧树脂热运动的限制作用，提高了环氧树脂/ PSF复合材料的热稳定性。DMA分析显示PSF / DDS0.25-DDM0.75有两个弛豫峰，这可能归因于相分离形态的形成以及具有不同交联密度的环氧网络。TGA测量表明，由于连续PSF域对环氧树脂热运动的限制作用，提高了环氧树脂/ PSF复合材料的热稳定性。DMA分析显示PSF / DDS0.25-DDM0.75有两个弛豫峰，这可能归因于相分离形态的形成和具有不同交联密度的环氧网络。

更新日期：2020-03-26

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