• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles.
【24h】

Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles.

机译：具有长纤维和纳米粒子的高级聚合物复合材料的制备，结构和性能。

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

Fiber-reinforced plastics have been widely used in many civil and military applications. In this research, the relationship of processing, structure, and property of carbon or glass fiber reinforced epoxy composites were studied. It is found that humidity has great impacts on the glass transition temperature, resin viscosity, curing kinetics, and tack property of epoxy prepregs, which may significantly affect the processing and the structure of products. The mechanism of marcel formation (fiber buckling) during compression molding was also investigated. Based on the experimental data, a statistic model was build to estimate the marcel size in the epoxy composites. The model can be also used to determine the proper processing parameters, such as mold temperature and pressure rate, to eliminate the fiber waviness. In addition, the ultrasonic consolidation of epoxy prepregs was compared with ordinary vacuum debulking at room temperature or high temperature. The results shows the ultrasonic consolidation is a promising method to lower the void content in the composites, and may replace the common debulking process in production.; Polymer nanocomposites have become one of the frontiers of materials sciences since the 1990s. In this study, epoxy, phenolic, and unsaturated polyester nanocomposites were prepared. Mechanical, thermal, and/or barrier properties of these nanocomposites were compared to neat resins. It is found that the addition of nanoparticles, such as nanoclays or carbon nanofibers, into polymer matrix can improve the strength and modulus, enhance the thermal stability, and lower the water absorption rate. Furthermore, great efforts have been made to combine the advantages of both fiber-reinforced plastics and polymer nanocomposites to produce a superior composite: long fibers and nanoparticles reinforced polymer composites. According to the characteristics of different polymer resins (epoxy, phenolic, and unsaturated polyester resins) and long fibers (glass or carbon fibers), several processes were selected to prepare various hybrid composites, such as compression molding and vacuum assisted resin transfer molding. The mechanical and thermal properties of these long fiber-nanoparticle reinforced composites were also measured. The significant improvement of these properties can be attributed to the synergic effects of long fiber and nanoparticles. In addition, nanoparticles brought some other properties to polymer materials, such as enhanced barrier properties.
机译：纤维增强塑料已广泛用于许多民用和军事应用。在这项研究中，研究了碳或玻璃纤维增​​强环氧复合材料的加工，结构和性能之间的关系。发现湿度对环氧预浸料的玻璃化转变温度，树脂粘度，固化动力学和粘着性能有很大影响，这可能会显着影响产品的加工和结构。还研究了压缩成型过程中马塞尔形成（纤维屈曲）的机理。基于实验数据，建立了统计模型来估计环氧复合材料中的毛坯尺寸。该模型还可用于确定适当的加工参数，例如模具温度和压力速率，以消除纤维起伏。另外，将环氧预浸料的超声固结与在室温或高温下的普通真空脱脂进行了比较。结果表明，超声固结是降低复合材料中孔隙含量的一种有前途的方法，并且可以代替生产中常见的减薄工艺。自1990年代以来，聚合物纳米复合材料已成为材料科学的前沿领域之一。在这项研究中，制备了环氧，酚醛和不饱和聚酯纳米复合材料。将这些纳米复合材料的机械，热和/或阻隔性能与纯树脂进行了比较。发现将纳米颗粒例如纳米粘土或碳纳米纤维添加到聚合物基质中可以提高强度和模量，增强热稳定性，并降低吸水率。此外，已经做出了巨大的努力来结合纤维增强塑料和聚合物纳米复合材料的优点，以生产出优异的复合材料：长纤维和纳米颗粒增强的聚合物复合材料。根据不同的聚合物树脂（环氧，酚醛和不饱和聚酯树脂）和长纤维（玻璃或碳纤维）的特性，选择了几种方法来制备各种混合复合材料，例如压缩成型和真空辅助树脂传递成型。还测量了这些长纤维-纳米颗粒增强复合材料的机械和热性能。这些性质的显着改善可归因于长纤维和纳米粒子的协同作用。另外，纳米粒子为聚合物材料带来了其他一些特性，例如增强的阻隔性能。

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