Abstract
A proton nuclear magnetic resonance (NMR) in solid poly-2-pyrrolidone (Nylon 4) was studied at temperatures between −165 ‡C and 185 ‡C. Wideline NMR spectra were measured on powdered samples of dry Nylon 4 and of moist Nylon 4. The second momentsM2 were calculated and likewise an analysis of the spectra according to K. Bergmann and K. Nawotki was performed for the purpose of the study of molecular motion in these samples. The second moment and the linewidth decrease with an increasing temperature. This fact testifies to an increasing intensity of molecular motion. It was found out that molecular motion is influenced by the presence of water and of low molecular fractions of the polymer. The presence of both factors is manifested by the decrease of theM2 values at temperatures higher than −60 ‡C. It was found out from the analysis of the NMR spectra thatα processes in noncrystalline (αa) and crystalline (αc) regions of the dry sample start at 110 ‡C. Crystallinity calculated by means of analysis of the spectra is 0·29. This value is in good agreement with the result obtained from the X-ray measurements.
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