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Epoxy-Amine Networks with Varying Epoxy Polydispersity

机译：具有变化的环氧多分散性的环氧胺网络

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Solid, high molecular weight DGEBA-based epoxies were blended with high purity liquid DGEBA to create several resins with equivalent epoxy equivalent weights, but with polydispersity indices (PDIs) ranging from 3 to over 10. The resins were cured with a stoichiometric amount of polyetheramine and compared to a nonblended epoxy with PDI of 1.8. Modulus, glass transition temperatures, and molecular weight between cross-links were measured using dynamic mechanical analysis. Coefficients of thermal expansion (CTE) were measured and used to extend room temperature density measurements as a function of temperature. Fracture properties were also measured. Overall, the increased polydispersity has almost negligible effect, with the main difference occurring in the slope of the glassy CTE, with more polydisperse epoxies having a slower increase in CTE. In comparison to previous work where bimodal amines were blended with DGEBA, we conclude that epoxy resins are far more sensitive to distributions in the flexible portion, rather than the more rigid one. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41503.
机译：将基于高分子量DGEBA的固体环氧树脂与高纯度液体DGEBA混合，以创建几种等效当量环氧当量，但多分散指数（PDI）为3至超过10的树脂。该树脂用化学计量的聚醚胺固化并与PDI为1.8的非混合环氧树脂进行比较。使用动态力学分析来测量模量，玻璃化转变温度和交联之间的分子量。测量了热膨胀系数（CTE），并将其用于扩展室温密度测量值与温度的函数关系。还测量了断裂性能。总体而言，增加的多分散性几乎可以忽略不计，主要区别在于玻璃态CTE的斜率，而更多的多分散性环氧树脂的CTE增长则较慢。与以前的双峰胺与DGEBA共混的工作相比，我们得出的结论是，环氧树脂对柔性部分的分布更为敏感，而不是刚性更高。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41503。

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