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Simultaneously enhanced impact strength and dielectric properties of an epoxy resin modified with EHTPB liquid rubber
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-06-12 , DOI: 10.1002/pen.25445
Wenying Zhou 1 , Xu Li 1 , Dan Cao 1 , Ying Li 2 , Caihua Zhang 1 , Zhen Li 1 , Fuxin Chen 1 , Ting Li 1 , Huiwu Cai 1 , Zhi‐Min Dang 3
Affiliation  

To simultaneously improve the impact strength and dielectric properties of cured epoxy (EP), herein we explore liquid rubber toughened EP based on a nonpolar epoxidized hydroxyl‐terminated polybutadiene (EHTPB), where the rubber is covalently bonded to the EP. Fourier transform infrared and nuclear magnetic resonance proved the chemical reaction between EHTPB and EP, which makes the immiscible EHTPB‐EP blend change to compatible one. The results indicate that both the impact strength and dielectric properties can be visibly enhanced with the addition of EHTPB and the maximum values are obtained at 10 phr of EHTPB loading. The improved mechanical toughness can be ascribed to the extensive shear yielding induced by the uniformly dispersed EHTPB domains and the enhanced interfacial compatibility between the two components. Moreover, the enhanced electrical resistivity and dielectric breakdown strength as well as the reduced dielectric constant and loss for the EHTPB‐EP can be attributed to the combination of the excellent insulating properties of HTPB and dielectrically favorable interfaces. Therefore, the EHTPB‐EP with a concurrent improvement in impact strength and dielectric properties can be used as promising insulating materials for high‐frequency microelectronics and high‐voltage electrical equipment.

中文翻译:

同时提高EHTPB液态橡胶改性环氧树脂的冲击强度和介电性能

为了同时提高固化环氧树脂(EP)的冲击强度和介电性能,在此我们探索基于非极性环氧化羟基封端的聚丁二烯(EHTPB)的液态橡胶增韧EP,其中橡胶与EP共价键合。傅立叶变换红外和核磁共振证明了EHTPB和EP之间的化学反应,这使不混溶的EHTPB-EP混合物变为兼容的。结果表明,通过添加EHTPB可以明显提高冲击强度和介电性能,并且在10 phr EHTPB载荷下可获得最大值。改善的机械韧性可以归因于均匀分散的EHTPB结构域引起的广泛的剪切屈服以及两种组分之间增强的界面相容性。此外,EHTPB-EP的增强的电阻率和介电击穿强度,以及降低的介电常数和损耗可以归因于HTPB优异的绝缘性能和良好的介电界面。因此,同时具有改善的冲击强度和介电性能的EHTPB-EP可用作高频微电子和高压电气设备的有希望的绝缘材料。
更新日期:2020-06-12
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