波谱学杂志 ›› 2015, Vol. 32 ›› Issue (4): 661-669.doi: 10.11938/cjmr20150411

• 低场磁共振技术与应用专栏 • 上一篇    下一篇

人造板吸水过程的 TD-NMR 动态研究

周云洁,张明辉*,李新宇,邵朱伟   

  1. 内蒙古农业大学 材料科学与艺术设计学院,内蒙古 呼和浩特 010018
  • 收稿日期:2014-12-24 修回日期:2015-10-23 出版日期:2015-12-05 发布日期:2015-12-05
  • 作者简介:周云洁(1989-),女,黑龙江抚远人,硕士研究生,材料加工工程专业. *通讯联系人:张明辉,电话: 15849376426, E-mail: zhangmh_email@aliyun.com.
  • 基金资助:

    国家自然科学基金资助项目(30800866, 31160141)

Water Absorption in Wood-Based Panel Observed by Dynamic Time-Domain Nuclear Magnetic Resonance Spectroscopy

ZHOU Yun-jieZHANG Ming-hui*LI Xin-yuSHAO Zhu-wei
  

  1. College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China
  • Received:2014-12-24 Revised:2015-10-23 Online:2015-12-05 Published:2015-12-05
  • About author:*Corresponding author: ZHANG Ming-hui, Tel: +86-15849376426, E-mail: zhangmh_email@aliyun.com
  • Supported by:

    国家自然科学基金资助项目(30800866, 31160141)

摘要:

利用时域核磁共振(TD-NMR)技术,为研究人造板和水分的关系提供新方法.该文通过研究胶合板(Plywood)、刨花板(Particle board)、中密度纤维板(Medium Density Fiberboard) 3 种常用人造板吸水过程中水分的自由感应衰减(FID)信号的变化,得出传统称重法得到的吸水率与吸水过程中测得的 FID 信号高度线性相关, 24 h 吸水率由大到小依次为胶合板>刨花板>中密度纤维板.通过 3 种人造板 24 h 吸水过程中自旋-自旋弛豫时(T2)大小及分布的实验数据,分析了吸水过程中人造板中水分的状态.实验结果证实了TD-NMR 是研究人造板与水分的关系的一个有效手段.

关键词: 时域核磁共振(TD-NMR), 吸水率, 自由感应衰减, 自旋-自旋弛豫时间, 人造板

Abstract:

Time-domain nuclear magnetic resonance (TD-NMR) technology may provide a new method to study water absorption in wood-based panels. We measured changes of free induction decay (FID) signal of water in plywood, particle board and medium density fiberboard after a 24-hour soaking process, and the results were correlated to water contents calculated with the traditional weighing method. The amount of water absorption was plywood > particleboard > medium density fiberboard. The state of water in the panels was analyzed by spin-spin relaxation time (T2) measurements. The result suggested that NMR is an effective tool to study the relationship between wood-based panels and water.

Key words: time-domain nuclear magnetic resonance, water absorption, free induction decay, spin-spin relaxation time, wood-based panel

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