...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Wood Science and Technology >Dielectric and mechanical properties of various species of Madagascan woods
【24h】

Dielectric and mechanical properties of various species of Madagascan woods

机译：多种马达加斯加木材的介电和机械性能

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

The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents-cellulose and lignin-as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-frequency analysis was carried out by thermostimulated current technique. Low-temperature relaxations of rosewood were assigned to low-temperature relaxations of cellulose. There was no dielectric response of lignin in rosewood. Contrarily, both cellulose and lignin responses were distinguished in ebony and varongy. Thermostimulated currents analyses exhibit the specific behavior of lignin in the various wood species. Moreover, the relaxation mode of cellulose observed at lower temperature remains localized in rosewood, while it tends to delocalize in varongy and ebony. The nature and intensity of physical interactions that induce variation of phase miscibility might be responsible for the observed differences. Even at the scale of the gamma relaxation, physical interactions modify molecular mobility.
机译：以纤维素和木质素这两种主要成分为参考，分析了三种不同木材的低温分子迁移率。使用了机械和介电动力学技术。为了观察木材广泛的弛豫模式的精细结构，通过热刺激电流技术进行了非常低频的分析。红木的低温松弛被归因于纤维素的低温松弛。红木中木质素没有介电响应。相反，纤维素和木质素的响应在乌木和瓦隆基中是不同的。热刺激电流分析显示了木质素在各种木材中的特殊行为。此外，在较低温度下观察到的纤维素的松弛模式仍然定位在花梨木中，而它倾向于在varongy和乌木中定位。引起相溶性变化的物理相互作用的性质和强度可能是所观察到的差异的原因。即使在伽马弛豫的范围内，物理相互作用也会改变分子的迁移率。

著录项

  • 来源
    《Wood Science and Technology》 |2017年第6期|1389-1404|共16页
  • 作者

    Roig Frederic; Ramanantsizehena Georgette; Razafindramisa Fils Lahatra; Dantras Eric; Dandurand Jany; Hoyet Herve; Bernes Alain; Lacabanne Colette;

  • 作者单位

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

    Univ Antananarivo, Fac Sci, Antananarivo, Madagascar;

    Univ Antananarivo, Fac Sci, Antananarivo, Madagascar;

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

    Univ Toulouse, CIRIMAT, Phys Polymeres, 118 Route Narbonne, F-31062 Toulouse, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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