Deep quenching of semi-crystalline polymer from the melt state down to below glass transition temperature results in the glassy state. Comparing with the melt grown process, the cold-crystallization of glass samples usually exhibit a much higher overall crystallization rate, which triggers numerous investigation of the glassy state. The short-range-ordered nature of polymer in the glassy state poses difficulty in analyzing the chain conformation, packing and folding structure by conventional characterization techniques. Here, we synthesized <sup>13</sup>C single and double sites labeled PLLA and investigated the structures of the glassy sample in detail. It was demonstrated that the conformational/packing/folding structures are quite similar between glassy and crystalline states. This result suggests that even rapidly quenched glassy sample possess the same local structure as the crystalline form.

Chain conformation, packing, and folding structures of poly(L-lactic acid) in glassy state as studied by <sup>13</sup>C solid-state NMR and selective isotope labeling

255th National Meeting (2018)

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Chain conformation, packing, and folding structures of poly(L-lactic acid) in glassy state as studied by 13C solid-state NMR and selective isotope labeling

Chain conformation, packing, and folding structures of poly(L-lactic acid) in glassy state as studied by ¹³C solid-state NMR and selective isotope labeling