I. V. Soloveva, S. V. Smirnov, V. A. Kuznetsov, M. I. Kodess, K. A. Chistyakov, A. P. Safronov, A. V. Pestov
{"title":"Copolymers of L-Lactide and ε-Caprolactone: Synthesis, Structural Analysis, and Mechanical Properties","authors":"I. V. Soloveva, S. V. Smirnov, V. A. Kuznetsov, M. I. Kodess, K. A. Chistyakov, A. P. Safronov, A. V. Pestov","doi":"10.1134/S1560090425600263","DOIUrl":null,"url":null,"abstract":"<p>The copolymers of <i>L</i>-lactide and ε-caprolactone are synthesized in the presence of tin(II) ethylhexanoate at 130°C for 72 h. The composition and structure of the products are determined by IR and <sup>1</sup>Н NMR spectroscopy, gel permeation chromatography, and elemental analysis. The molar ratio [monomer] : [initiator] = 4000 : 1 allowed the synthesis of the polymers with an number-average molecular weight of 47 000–66 000 g/mol with the polydispersity index not above 1.6. It was found that during transition from the glassy to highly elastic state, an increase in the content of ε-caprolactone units in the copolymer from 14 to 74 mol % leads to a decrease in the elastic modulus from 1379 to 65 MPa and a decrease in the maximum stress from 33 to 4 MPa. The copolymers containing 27 and 37 mol % of ε-caprolactone units possess plasticity and sufficient strength, which enables their use in medicine and the packaging industry.</p>","PeriodicalId":739,"journal":{"name":"Polymer Science, Series B","volume":"66 6","pages":"731 - 738"},"PeriodicalIF":0.9000,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Science, Series B","FirstCategoryId":"1","ListUrlMain":"https://link.springer.com/article/10.1134/S1560090425600263","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
The copolymers of L-lactide and ε-caprolactone are synthesized in the presence of tin(II) ethylhexanoate at 130°C for 72 h. The composition and structure of the products are determined by IR and 1Н NMR spectroscopy, gel permeation chromatography, and elemental analysis. The molar ratio [monomer] : [initiator] = 4000 : 1 allowed the synthesis of the polymers with an number-average molecular weight of 47 000–66 000 g/mol with the polydispersity index not above 1.6. It was found that during transition from the glassy to highly elastic state, an increase in the content of ε-caprolactone units in the copolymer from 14 to 74 mol % leads to a decrease in the elastic modulus from 1379 to 65 MPa and a decrease in the maximum stress from 33 to 4 MPa. The copolymers containing 27 and 37 mol % of ε-caprolactone units possess plasticity and sufficient strength, which enables their use in medicine and the packaging industry.
期刊介绍：
Polymer Science, Series B is a journal published in collaboration with the Russian Academy of Sciences. Series B experimental and theoretical papers and reviews dealing with the synthesis, kinetics, catalysis, and chemical transformations of macromolecules, supramolecular structures, and polymer matrix-based composites (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed
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