波谱学杂志 ›› 2010, Vol. 27 ›› Issue (2): 150-156.

• 研究论文 • 上一篇    下一篇

聚酰胺66溶液弛豫行为的NMR研究

王琳琳, 赵新, 孙万赋   

  1. 新疆大学 理化测试中心,新疆 乌鲁木齐 830046
  • 收稿日期:2009-12-28 修回日期:2010-03-02 出版日期:2010-06-05 发布日期:2010-06-05

An NMR Relaxation Study of Polyamide66 Solution

 WANG Lin-Lin, ZHAO Xin, SUN Man-Fu   

  1. Center of Analysis and Measurement, Xinjiang University, Urumqi 830046, China
  • Received:2009-12-28 Revised:2010-03-02 Online:2010-06-05 Published:2010-06-05

摘要:

用1D和2D NMR技术归属了聚酰胺66的1H和13C的NMR共振信号,并通过聚酰胺66溶液温度和浓度改变对氢核弛豫时间的影响,得到了其分子运动信息. 结果表明随着温度的升高,聚酰胺66链间氢键逐渐解离,大分子链间相互作用逐渐减弱. 而解离出来的链段又与溶剂小分子可以形成新的氢键,使聚酰胺66链卷曲并包含着部分溶剂分子一起运动.  随着溶液浓度的增大,由于分子链间距变小,使得分子间作用力增强,链缠结程度加大,使链运动受限. 

关键词: 核磁共振(NMR), 氢键,  弛豫, 聚酰胺66

Abstract:

The major 1H  and 13C NMR resonance of polyamide66 in solution were assigned. Relaxation time of 1H resonance was measured at different temperatures and different concentrations, providing information about molecular motion of the polyamide chains in solution. The interactions between polyamide66 chain segments were found gradually weakened with increasing temperature. This led to dissociation of hydrogen bonding among the polyamide66 chain segments, and binding of solvent molecules to the dissociated free -CO and -NH groups in polyamide66 molecules. The main chains of polyamide66 coiled and aggregated with a shape of random clew with a part of the solvent molecules imbedded, restricting the motions. With increasing concentration, the distances among protons decreased, resulting in strengthened interactions among polyamide66 chain segments, entanglement of the main chains and restricted motions for the macromolecules.

Key words: NMR, hydrogen bonding, relaxation, Polyamide66

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