Cyclic poly(l-lactide)s via ring-expansion polymerizations catalysed by 2,2-dibutyl-2-stanna-1,3-dithiolane

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发布日期 2017-01-31

DOI 10.1039/C6PY02166B

影响因子 5.582

作者

H. R. Kricheldorf, S. M. Weidner, F. Scheliga

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摘要

L-Lactides were polymerized in bulk at 120 or 160 °C with cyclic dibutyltin catalysts derived from 1,2-dimercaptoethane or 2-mercaptoethanol. Only linear chains having one benzyl ester and one OH-end group were obtained when benzyl alcohol was added. When L-lactides were polymerized with neat dibutyl-2-stanna-1,3-dithiolane, exclusively cyclic polylactides were formed even at 120 °C. The temperature, time and monomer/catalyst ratio (M/C) were varied. These results are best explained by a combination of ring-expansion polymerization and ring-extrusion of cyclic oligo- or polylactides with elimination of the cyclic catalyst. Neither syntheses of linear polylactides nor of cyclic lactides involved racemization up to 20 h at 160 °C.

期刊推荐

Electroanalysis

Cellulose

Medicinal Chemistry Research

Colloid Journal

Journal of Asian Natural Products Research

Critical Reviews in Solid State and Materials Sciences

Bioorganic & Medicinal Chemistry Letters

Polycyclic Aromatic Compounds

Topics in Catalysis

Atomization and Sprays

来源期刊

Polymer Chemistry

CiteScore: 8.6

自引率: 7.3%

年发文量: 457

Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.

Cyclic poly(l-lactide)s via ring-expansion polymerizations catalysed by 2,2-dibutyl-2-stanna-1,3-dithiolane

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