...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Curing behaviour of epoxy resin/graphite composites containing ionic liquid
【24h】

Curing behaviour of epoxy resin/graphite composites containing ionic liquid

机译：含离子液体的环氧树脂/石墨复合材料的固化行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

By adopting the isoconversional method, subtle changes in the curing activation energy (E_a) among epoxy resin/graphite composites by the inclusion of expanded graphite (EG), ionic liquid of 1-butyl-3-methyl-imidazolium hexafluorophosphate ([BMIm]PF_6) or their combination are shown in the whole conversion range. At lower concentrations (1 phr) of EG, compared with the E_a of the neat epoxy resin, the composite with EG has a lower E_a before the gelation, and a higher Ea after the gelation. At higher concentrations of EG, however, in the whole conversion range, the composite with EG shows a higher Ea compared with the neat epoxy resin. As the curing proceeded, a peculiar increase in E_a is found in systems containing [BMIm]PF_6. Due to the formation of hydrogen bonding between [BMIm]PF_6 and the hardener (Jeffamine), the reactivity of Jeffamine is considerably decreased, leading to a much higher E_a in [BMIm]PF_6-containing systems, especially at higher conversion. In systems containing a combination of [BMIm]PF_6 and EG, due to the interactions between EG and [BMIm]PF_6, the shielding effect provided by the well-dispersed EG sheets constrains the formation of the hydrogen bonding between [BMIm]PF_6 and Jeffamine, leading to lowered E_a compared with that for the system containing [BMIm]PF_6 only.
机译：通过采用等转化法，通过添加膨胀石墨（EG），六氟磷酸1-丁基-3-甲基咪唑鎓离子液体（[BMIm] PF_6），环氧树脂/石墨复合材料中固化活化能（E_a）发生细微变化。 ）或它们的组合显示在整个转化范围内。与纯环氧树脂的E_a相比，在较低浓度（1 phr）的EG下，具有EG的复合材料在凝胶化之前具有较低的E_a，在凝胶化之后具有较高的Ea。但是，在较高的EG浓度下，在整个转化率范围内，与EG相比，含EG的复合材料显示出更高的Ea。随着固化的进行，在含有[BMIm] PF_6的系统中发现E_a的异常增加。由于在[BMIm] PF_6与硬化剂（Jeffamine）之间形成氢键，Jeffamine的反应性大大降低，导致含[BMIm] PF_6的系统的E_a高得多，尤其是在较高转化率下。在包含[BMIm] PF_6和EG的组合的系统中，由于EG和[BMIm] PF_6之间的相互作用，分散良好的EG片材提供的屏蔽作用限制了[BMIm] PF_6和Jeffamine之间氢键的形成，与仅包含[BMIm] PF_6的系统相比，导致E_a降低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号