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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Thermal Exposure on the Properties of Phenolic Componsites: Dynmic Mechanical Analysis
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Effect of Thermal Exposure on the Properties of Phenolic Componsites: Dynmic Mechanical Analysis

机译：热暴露对酚醛复合材料性能的影响：动态力学分析

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Changes in the dynamic response of glass-reinforced phenolic composites following thermal exposure at 180°C for periods of time up to 28 days were monitored using dynamic mechanical analysis. Four phenolic resins were investigated: a resoV novolac blend, a phenolic-furan novolaclresol graft copolymer, a novolac, and a resol. Reactive blending and copolymerization of phenolic resins are currently being investi- gated to determine if these techniques will produce phenolic resins (and composites) that have improved impact properties and retain the excellent high-temperature prop- erties of resol and novolac phenolic resins. The results indicate that thermal aging at 180"C for 1 day led to a more complete cure of all four phenolic resins as indicated by an increase in the temperature of the maximum of plots of both loss modulus IE") and tan O versus temperature. The storage modulus (E' ) of the composites at 40°C varied little following thermal aging at 180"C for 1 day but decreased with increasing exposure time for samples aged 2, 7, and 28 days. Thermal aging led to an increase in E' at higher temperatures and the magnitude of E' at a given temperature decreased with increas- ing exposure time. The magnitude of E" and tan O decreased with aging time for all resins, although E" and tan O were larger for the blend and copolymer composites than for the novolac and resol composites
机译：使用动态力学分析监测了玻璃纤维增​​强的酚醛复合材料在180°C下热暴露28天后的动态响应变化。研究了四种酚醛树脂：resoV酚醛清漆共混物，酚醛-呋喃酚新酚醛树脂接枝共聚物，酚醛清漆和甲阶酚醛树脂。目前正在研究酚醛树脂的反应性共混和共聚，以确定这些技术是否会生产出具有改善的冲击性能并保留甲阶酚醛树脂和线型酚醛酚醛树脂的优异高温性能的酚醛树脂（和复合材料）。结果表明，在180℃下热老化1天导致所有四种酚醛树脂的更完全固化，这通过损耗模量IE”和tan O随温度的最大曲线图的最高温度的升高来表明。在180°C下热老化1天后，复合材料在40°C时的储能模量（E'）变化不大，但是随着暴露时间的延长，分别在2、7和28天时降低。高温下的E'值和给定温度下的E'值随着暴露时间的增加而降低。所有树脂的E“和tan O的值均随老化时间而降低，尽管共混物的E”和tan O较大和共聚物复合材料，而不是酚醛清漆和甲阶酚醛树脂

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