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林业科学 ›› 2005, Vol. 41 ›› Issue (3): 115-120.doi: 10.11707/j.1001-7488.20050319

• 论文及研究报告 • 上一篇    下一篇

利用DSC研究异氰酸酯与纤维素的反应机理

高振华 顾继友 李志国   

  1. 东北林业大学材料科学与工程学院,哈尔滨150040
  • 收稿日期:2003-12-30 修回日期:1900-01-01 出版日期:2005-05-25 发布日期:2005-05-25

The DSC Study on the Reaction Mechanism of Isocyanate with Cellulose

Gao Zhenhua,Gu Jiyou,Li Zhiguo   

  1. College of Material Science and Engineering, Northeast Forestry University Harbin150040
  • Received:2003-12-30 Revised:1900-01-01 Online:2005-05-25 Published:2005-05-25

摘要:

应用DSC分析中的等温扫描和等速升温扫描,研究异氰酸酯与不同含水率纤维素反应机理。等温DSC研究揭示含水纤维素与异氰酸酯反应时,存在无规成核机理、扩散机理和相界面机理等多种情形,水分迁移作用和异氰酸酯与水反应速率较快是致使异氰酸酯与含水纤维素的反应机理复杂的关键。通过等速升温DSC研究,找到一种能够描述异氰酸酯与不同含水纤维素等速升温反应的机理函数。

关键词: 异氰酸酯, 纤维素, 含水率, DSC分析, 反应机理

Abstract:

The paper studied the reaction mechanism of isocyanate with cellulose containing different moisture content (MC) by DSC analysis of isothermal scanning and temperature_increased scanning. The isothermal DSC analysis showed that the Ruleless Coring Mechanism, Diffusion Mechanism and Phase Interface Mechanism would control the reaction of isocyanate and cellulose with different MC. The key effects of complicated mechanism rest with water transference and fast reaction of isocyanate and water. A mechanism function that will describe ideally the temperature_increased reaction of isocyanate and cellulose with different MC was brought forward.

Key words: isocyanate, cellulose, moisture content, DSC analysis, reaction mechanism