Enhanced melt stability of star-shaped stereocomplexes as compared with linear stereocomplexes

被引：142

作者：

Biela, Tadeusz ^{[1
]}

Duda, Andrzej ^{[1
]}

Penczek, Stanislaw ^{[1
]}

机构：

[1] Polish Acad Sci, Ctr Mol & Macromol Studies, Dept Polymer Chem, PL-90363 Lodz, Poland

来源：

MACROMOLECULES | 2006年 / 39卷 / 11期

关键词：

D O I：

10.1021/ma060264r

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理]; 080501 [材料物理与化学]; 081704 [应用化学];

摘要：

The instance of star-shaped high molar mass (Mn ≥ 10 5) enantiomeric polylactides formation or re-formation of the poly [(R)-lactide]/poly[(S)-lactide] stereocomplex in the melt due to hardlock-type interactions was investigated. The preparation of higher melting, stable polymeric stereocomplexes was based on the high molar mass polylactides. The dried stereocomplexes were separated and washed with methanol and were analyzed by differential scanning calorimetry (DSC). In star-shaped macromolecules arms forming stereocomplexespredominantlyantly interact in the antiparallel manner because of the fixation of the symmetry of PLA arms in the star structure. The enhanced stability of the stereocomplexes result from the exclusively antiparallel packing provided that antiparallelism gives enhancements of stability.

引用

页码：3710 / 3713

页数：4

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