Molecular Structural Basis for Stereocomplex Formation of Polylactide Enantiomers in Dilute Solution
Molecular Structural Basis for Stereocomplex Formation of Polylactide Enantiomers in Dilute Solution
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DOI：
10.1021/acsmacrolett.5b00685
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发表时间：
2015-11-01
影响因子：
7.015
通讯作者：
Miyoshi, Toshikazu
中科院分区：
文献类型：
--
作者：
Chen, Wei;Wang, Shijun;Miyoshi, Toshikazu
聚(L-丙交酯)(PLLA)和聚D-丙交酯(PDLA)交替包装，形成立体络合物晶体(SCS)。在稀溶液中形成的干细胞的结晶习性高度依赖于分子量(<；M-w>；)。在这项研究中，我们用先进的双量子核磁共振方法研究了具有高或低<；m-w>；S的PDLA的SCS中C-13标记的PLLA(L-PLLA)链的折叠(CF)结构。结果发现，L-PLLA链的连续相邻再入次数的系综平均值与SCS中反的PDLA链的<；M-w>；S有关。结果表明，L-聚乳酸的碳纤维结构与聚乳酸的<；M-w>；S有关，决定了SCs的结晶习性。
Poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) alternatively pack with each other and form stereo-complex crystals (SCs). The crystal habits of SCs formed in the dilute solution highly depend on the molecular weight (< M-w >). In this study, we investigated chain-folding (CF) structure for C-13 labeled PLLA (l-PLLA) chains in SCs with PDLAs that have either high or low < M-w > s by employing an advanced Double Quantum (DO) NMR It was found that the ensemble average of the successive adjacent re-entry number < n > for the l-PLLA chains drastically change depending on < M-w > s of the counter PDLA chains in the SCs. It was concluded that the CF structures of l-PLLA depending on < M-w > s of PDLA determine the crystal habits of SCs.