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首页> 外文期刊>Journal of Applied Polymer Science >Toughening mechanism of rubber reinforced epoxy composites by thermal and microwave curing
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Toughening mechanism of rubber reinforced epoxy composites by thermal and microwave curing

机译：热和微波固化橡胶增强环氧复合材料的增韧机理

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摘要

The carboxyl terminated polybutadiene (CTBN) is utilized to improve the toughness of diglycidylether of bisphenol A epoxy cured by heat and microwave. The change of viscosity, chemical groups, and the glass transition temperature (T-g) of system are analyzed. The impact performance is characterized to evaluate the fracture toughness, and tensile properties also are investigated. The fracture morphologies are observed by the scanning electron microscopy for exploring toughening mechanism. The viscosity results indicate that viscosity of system increases with increasing of CTBN, demonstrating the formation of precrosslinking and interpenetrating network structure of two phases. The Fourier transform infrared spectrometer results show that effective chemical bonds are formed between CTBN and epoxy resins. The Tg decreases with introducing CTBN, indicating the decline of crosslinking density, which further suggests inherent three-dimensional structure have been changed. The impact strength and energy increase with increasing of CTBN, and reach a maximum value of 5.92 kJ/m(2) and 0.13 kJ at 15% for thermal curing, respectively, increased by 36.8% and 23.1% relative to microwave curing system, while tensile strength and modulus reach the optimum at 5%. Scanning electron microscopy observation finds that "plastic tensile" and "microvoid" deriving from "sea-island" structure exist, presenting the ductile fracture features. (C) 2017 Wiley Periodicals, Inc.
机译：羧基封端的聚丁二烯（CTBN）用于改善通过热和微波固化的双酚A环氧树脂的二缩水甘油醚的韧性。分析了粘度，化学基团和玻璃化转变温度（T-G）的变化。冲击性能的特征在于评估断裂韧性，也研究了拉伸性能。通过扫描电子显微镜观察骨折形态，用于探索增韧机制。粘度结果表明系统粘度随着CTBN的增加而增加，证明了两个阶段的预紧链接和互穿网络结构的形成。傅里叶变换红外光谱仪结果表明，在CTBN和环氧树脂之间形成有效的化学键。 TG通过引入CTBN减少，表明交联密度的下降，这进一步提出了固有的三维结构已经改变。随着CTBN的增加，冲击强度和能量增加，并且达到5.92kJ / m（2）和0.13kJ的最大值，分别为热固化，相对于微波固化系统增加36.8％和23.1％，而拉伸强度和模量达到5％的最佳效果。扫描电子显微镜观察发现，“塑料拉伸”和“微宽度”存在于“海岛”结构中，呈现韧性骨折特征。 （c）2017 Wiley期刊，Inc。

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