Proton NMR study of molecular motion in bulk and in highly drawn fiber polyamide-6 |
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Authors: | R Blinc T Apih P Jeglič I Emri T Prodan |
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Institution: | 1. J. Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia 2. Center for Experimental Mechanics, University of Ljubljana, Ljubljana, Slovenia
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Abstract: | The proton motion in bulk and highly drawn fiber polyamide-6 has been studied by field cycling relaxometry and proton line
shape measurements. The dips in theT
1 dispersion allowed for the determination of the14N quadrupole coupling tensor. The fact that only one set of14N nuclear quadrupole resonance lines, has been found shows that all N-H groups in nylon-6 are H-bonded. A striking difference
in the main line width transition and the low-frequency molecular dynamics has been observed between a slowly cooled “bulk”
polyamide-6 sample and a rapidly cooled and highly drawn “fiber” sample by wide line proton nuclear magnetic resonance line
shape and spin-lattice relaxation time measurements. This result is consistent with the picture that shearing melt processing
procedures, such as spinning, plant stable and long-lived crystallization nuclei into the amorphous phase which impose additional
motional constraints on the surroundings and inhibit the self-diffusion process. |
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