Over the last half century, chain-folding structure of semicrystalline polymers has been debated in polymer science. Thereby, it is not well understood that how topological constraints via entanglement, solvent-polymer interactions, molecular weight, and kinetics influence chain trajectory of semicrystalline polymers. Recently, 13C-13C double quantum (DQ) NMR spectroscopy combined with 13C selective isotope labeling has been developed to investigate re-entrance sites of the folded chains, mean values of adjacent re-entry number &lt;n&gt; and fraction &lt;F&gt; of semicrystalline polymer. This talk highlights the versatile approaches of using solid-state (ss) NMR and isotope labeling for revealing i) chain trajectory in melt- and solution-grown crystals, ii) kinetics and molecular weight effects on chain trajectory in polymer crystals, iii) solvent-polymer interactions in good or poor solvents, and iv) topological constraints on chain-folding process and structure.

Understanding of polymer crystallization at the molecular scale: Topology, kinetics, and molecular weight effects

255th National Meeting (2018)

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