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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Focus: Polymer Crystallization - from Model Systems to New Materials II

CPP 40.5: Hauptvortrag

Mittwoch, 22. März 2017, 16:30–17:00, ZEU 222

Chain Trajectory of Semicrystalline Polymers as Revealed by Solid-State NMR Spectroscopy — •Toshikazu Miyoshi — The University of Akron, Department of Polymer Science, Akron OH, USA

Over the last half century, chain-folding structure of semicrystalline polymers has been debated in polymer science. 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 <n> and fraction <F> of semicrystalline polymers. This viewpoint highlights the versatile approaches using NMR and isotope labeling for revealing i) chain trajectory in melt- and solution-grown crystals, ii) conformation of the folded chains in single crystals, iii) self-folding in the early stage of crystallization, and iv) unfolding of the folded chains under stretching.