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首页> 外文期刊>Journal of Applied Polymer Science >Hygrothermal Aging of Rubber-Modified and Mineral-Filled Dicyandiamide-Cured DGEBA Epoxy Resin. II. Dynamic Mechanical Thermal Analysis
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Hygrothermal Aging of Rubber-Modified and Mineral-Filled Dicyandiamide-Cured DGEBA Epoxy Resin. II. Dynamic Mechanical Thermal Analysis

机译：橡胶改性和矿物填充双氰胺固化的DGEBA环氧树脂的湿热老化。二。动态机械热分析

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摘要

The effects of hydration-dehydration cycling on the dynamic mechanical response of a rubber modified, mineral-filled epoxy resin based on teh diglycidyl ether of bisphenol A curred with dicyandiamide are reported. Samples of the resin were aged in both deionized water and 5% w/w NaCl solution at 65 deg C. A dynamic mechanical thermal analyzer was used to detect the changes in the mechanical spectrum of the material induced by moisture ingress. Water absorbed at weight fractions up to 4.3% caused plasticization of the polymer matrix, and the measured decrease in the glass transition temperature could be interpreted in terms of the polymer network-diluent theory. Water absorbed at levels>4.3% weight fraction resides in microcavities formed as result of the aging process and did not further affect th4e dynamic mechanical response of the resin. The dynamic mechanical properties of the material were independent of the previous history of exposure to humidity. In the presence of NaCl, the microcavity growth was prevented and the amount of water absorbed did not exceed 4.1% weight fraction.
机译：据报道，水合脱水循环对基于双氰胺固化的双酚A的二缩水甘油醚的橡胶改性矿物填充环氧树脂的动态力学响应的影响。树脂样品在去离子水和5％w / w NaCl溶液中于65℃老化。使用动态机械热分析仪检测由水分进入引起的材料机械光谱变化。吸收重量分数高达4.3％的水会引起聚合物基体的增塑，并且可以根据聚合物网络稀释剂理论来解释所测得的玻璃化转变温度的降低。水分含量> 4.3％（重量）的吸收水存在于老化过程中形成的微腔中，不会进一步影响树脂的动态机械响应。材料的动态力学性能与先前暴露于湿气的历史无关。在NaCl的存在下，防止了微腔的生长，并且吸水量不超过4.1％（重量）。

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