Chinese Journal of Magnetic Resonance ›› 2010, Vol. 27 ›› Issue (2): 150-156.

• Articles • Previous Articles     Next Articles

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

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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