Ductile high-Tg epoxy systems via incorporation of partially reacted substructures,Journal of Materials Chemistry A

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Ductile high-Tg epoxy systems via incorporation of partially reacted substructures
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-14 , DOI: 10.1039/d0ta08158b
M. Sharifi _{1,

2,

3,

4} , G. R. Palmese _{1,

2,

3,

4}

Affiliation

A method is demonstrated for obtaining high glass transition temperature (T_g) plastically deformable crosslinked polymer systems by manipulating the network topology of epoxy systems cured with amines. Long-chain Monoamine-functionalized Partially Reacted Substructures (mPRS) were synthesized by reacting a mixture of tetraglycidyl ether of diaminodiphenylmethane (TGDDM) and polyether monoamine (PEMA) to varying extents. Predetermined amounts of the mPRS having 0%, 60%, and 80% degree of polymerization were added to a mixture of a TGDDM and polyether diamine (PEDA) as well as a mixture of diglycidyl ether of bisphenol-A (DGEBA) and PEDA. Results of quasi-static tensile tests performed on the cured samples reveal pronounced strain hardening and, subsequent, large elongation-to-failure in the modified epoxy systems containing mPRS with elevated degrees of polymerization. Thus materials with distinctly improved elongation-to-failure are obtained for systems with identical overall chemical composition. The striking difference is attributed to plastic microvoid growth aided by the presence of deformable mPRS domains. Fracture surfaces of deformed mPRS modified systems show the characteristic formation of microvoids. In comparison, similar systems based on less deformable diamine functionalized substructures (PRS), on which we reported previously, did not show the same propensity to yield and deform plastically.

中文翻译：

通过掺入部分反应的亚结构的高韧性Tg环氧体系

演示了获得高玻璃化转变温度（T _g），通过控制用胺固化的环氧体系的网络拓扑结构，可塑性变形的交联聚合物体系。通过使二氨基二苯甲烷的四缩水甘油醚（TGDDM）和聚醚单胺（PEMA）的混合物发生不同程度的反应，合成了长链单胺官能化的部分反应的子结构（mPRS）。将预定量的具有0％，60％和80％聚合度的mPRS添加到TGDDM和聚醚二胺（PEDA）的混合物，以及双酚A的二缩水甘油醚（DGEBA）和PEDA的混合物中。对固化样品进行的准静态拉伸试验的结果表明，在含有提高聚合度的含mPRS的改性环氧体系中，明显的应变硬化以及随后的大断裂伸长率。因此，对于具有相同整体化学组成的系统，可以获得具有明显改善的断裂伸长率的材料。显着差异归因于可变形mPRS结构域的存在，从而促进了塑料微孔的生长。变形的mPRS修饰系统的断裂表面显示出微孔的特征性形成。相比之下，我们先前报道的基于较少变形的二胺功能化亚结构（PRS）的相似系统没有表现出相同的屈服和塑性变形倾向。

更新日期：2020-11-25

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