Abstract
A detailed analysis of the temperature dependent solid state carbon-13 spectrum of a low molecular weight polyethylene fraction, that was isothermally crystallized in extended chain forms is reported. The observed resonances were assigned to specific carbons and the 13C spin-lattice relaxation times, T1C, for the internal and α-methylene carbons as well as the end-group methyl carbons were determined. Based on the analysis, and an accompanying thermogram, obtained by differential scanning calorimetry, it was concluded that conformational disordering of the chain-end sequence takes place at temperatures well below the fusion range. This conclusion is in accord with the standard model that has been taken for an equilibrium crystallite.
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Nakaoki, T., Kitamaru, R., Alamo, R. et al. The Conformational Change with Temperature of End Group Sequences of Low Molecular Weight Polyethylene. Polym J 32, 876–882 (2000). https://doi.org/10.1295/polymj.32.876
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DOI: https://doi.org/10.1295/polymj.32.876