• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>journal of applied polymer science >Structural, mechanical, and thermal properties of extruded sheets of a liquid crystalline copolyester
【24h】

Structural, mechanical, and thermal properties of extruded sheets of a liquid crystalline copolyester

机译：Structural, mechanical, and thermal properties of extruded sheets of a liquid crystalline copolyester

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

AbstractStructural, Mechanical, and thermal properties of extruded sheets of a liquid crystalline copolyester containingp‐hydroxybenzoic acid and 2‐hydroxynaphthoic acid were investigated using X‐ray diffraction measurements, differential scanning calorimetry, rheovibron measurements, and scanning electron microscopic observation. The extruded sheets of the thermotropic copolyester are composed of layered structures containing skin and core layers. A skin layer comprises fine fibrils oriented almost parallel to the extrusion direction. A core layer contains poorly oriented thicker fibrils or platelike structures. The orientation function of sheets and their tensile dynamic modulus parallel to the extrusion direction increase with increasing draw‐down ratio of the sheet. Annealing of the sheet caused the increases in the temperature and the heat of crystal—mesophase transition, the heat‐resistance to the mechanical tensiles properties, and the inherent viscosity of the polymer. The effect of annealing on the structural properties of the extruded sheet was discussed. © 1993 John Wil

著录项

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