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首页> 外文期刊>Nanotechnology >Self-assembly of a polymer pair through poly(lactide) stereocomplexation
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Self-assembly of a polymer pair through poly(lactide) stereocomplexation

机译：通过聚（丙交酯）立体络合物自组装聚合物对

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摘要

A polymer pair composed of poly( N-isopropylacrylamide-co-2-hydroxyethyl methacrylate terminated oligo( L-lactide)) ( poly( NIPAAm-co-HEMAOLLA)) graft random copolymer and poly( D-lactide) ( PDLA) homopolymer was self-assembled into micelles with a diameter around 100 nm through the stereocomplexation between the OLLA branches of the graft copolymer and the PDLA homopolymer. The specific intermolecular stereocomplexation was considered as the powerful ordered aggregation force in the micelle cores. The shell's component of poly( NIPAAm-co-HEMA) and its thermosensitivity were proved by H-1 nuclear magnetic resonance ( NMR) and dynamic light scattering ( DLS), respectively. The incorporation of PDLA homopolymer into the graft copolymer affected the micelle size and the critical micelle concentration ( CMC). The incorporation of even a small quantity ( 11 wt%) of PDLA into the graft copolymer micelles resulted in a great decrease of the micelle size. For the graft copolymer with low per cent grafting of 18%, the size of the corresponding micelles decreased slightly even if the PDLA content increased up to 33 wt%. For the graft copolymer with high per cent grafting of 58%, with the further increase of PDLA content, the size of the corresponding micelles at first decreased further and then began to increase. The molecular weight of the PDLA did not significantly affect the micelle size. The polymer pair micelles all showed lower CMC than that of the pure graft copolymer micelles. The higher the PDLA content in the polymer pair micelles, the lower the CMC. TEM results showed that the micelles had core-shell structure and that the polymer pair micelles exhibited a higher chain density in the core than that of the pure graft copolymer micelles.
机译：由聚（N-异丙基丙烯酰胺-甲基丙烯酸-2-羟乙酯-甲基丙烯酸酯封端的低聚（L-丙交酯））（聚（NIPAAm-共-HEMAOLLA））接枝无规共聚物和聚（D-丙交酯）（PDLA）均聚物组成的聚合物对为通过接枝共聚物的OLLA支链与PDLA均聚物之间的立体络合而自组装成直径约100 nm的胶束。特定的分子间立体复合被认为是胶束核心中强大的有序聚集力。分别通过H-1核磁共振（NMR）和动态光散射（DLS）证明了聚NIPAAm-co-HEMA的壳成分及其热敏性。将PDLA均聚物掺入接枝共聚物中会影响胶束大小和临界胶束浓度（CMC）。即使将少量（11wt％）的PDLA掺入到接枝共聚物胶束中，也导致胶束尺寸大大减小。对于接枝率低至18％的接枝共聚物，即使PDLA含量增加到33 wt％，相应胶束的尺寸也会略有减小。对于具有58％的高接枝率的接枝共聚物，随着PDLA含量的进一步增加，相应胶束的尺寸首先进一步减小，然后开始增大。 PDLA的分子量没有显着影响胶束大小。聚合物对胶束均显示出比纯接枝共聚物胶束更低的CMC。聚合物对胶束中PDLA含量越高，CMC越低。 TEM结果表明，该胶束具有核-壳结构，聚合物对胶束在芯中的链密度比纯接枝共聚物胶束高。

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