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首页> 外文期刊>Journal of Applied Polymer Science >Amine/epoxy stoichiometric ratio dependence of crosslinked structure and ductility in amine-cured epoxy thermosetting resins
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Amine/epoxy stoichiometric ratio dependence of crosslinked structure and ductility in amine-cured epoxy thermosetting resins

机译：胺/环氧化学计量与交联结构和延展性在胺固化环氧热固性树脂中的依赖性依赖性

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摘要

Epoxy-amine thermosetting resins undergo different reactions depending on the amine/epoxy stoichiometric ratio (r). Although many desirable properties can be achieved by varying the stoichiometric ratio, the effects of the variation on the crosslinked structure and mechanical properties and the contribution of these factors to the ductility of materials have not been fully elucidated. This study investigates the brittle-ductile behavior of epoxies with various stoichiometric ratios and performs curing simulations using molecular dynamics (MD) to evaluate the crosslinked structures. The molecular structure is predominantly branched in low-stoichiometric ratio samples, whereas the chain extension type structure dominates the high-stoichiometric ratio samples. As a result, the higher-stoichiometric ratio samples enhances the ductility of materials and the elongation at break increases form 1.4% (r = 0.6) to 11.4% (r = 1.4). Additionally, the tensile strength (105.4 MPa) and strain energy (7.96 J/cm(3)) are maximum at r = 0.8 and 1.2, respectively. On the other hand, the Young's modulus is negatively impacted and it decreased from 4.2 to 2.7 GPa with increasing stoichiometric ratio.
机译：环氧胺热固性树脂根据胺/环氧树脂的化学计量比（r）经历不同的反应。虽然通过改变化学计量比可以获得许多理想的性能，但这种变化对交联结构和机械性能的影响以及这些因素对材料延展性的贡献尚未完全阐明。本研究调查了不同化学计量比的环氧树脂的脆韧性行为，并使用分子动力学（MD）进行固化模拟，以评估交联结构。低化学计量比样品的分子结构主要为支链结构，而高化学计量比样品的分子结构主要为扩链结构。因此，较高的化学计量比样品提高了材料的延展性，断裂伸长率从1.4%（r=0.6）增加到11.4%（r=1.4）。此外，拉伸强度（105.4 MPa）和应变能（7.96 J/cm（3））分别在r=0.8和1.2时达到最大值。另一方面，杨氏模量受到负面影响，随着化学计量比的增加，杨氏模量从4.2 GPa下降到2.7 GPa。

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