Chain Trajectory of Semicrystalline Polymers As Revealed by Solid-State NMR Spectroscopy

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• 作者：You-lee Hong ; Wei Chen ; Shichen Yuan ; Jia Kang ; Toshikazu Miyoshi
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：March 15, 2016
• 年：2016
• 卷：5
• 期：3
• 页码：355-358
• 全文大小：332K
• ISSN：2161-1653

文摘

Over the last half century, a 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 of using solid-state (ss) 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.