Unsaturated copolyesters of lactide. Issue 96 (30th September 2016)

• Record Type: Journal Article
• Authors: Lahcini, M.; Weidner, S. M.; Oumayama, J.; Scheliga, F.; Kricheldorf, H. R.
• Is Part Of: RSC advances. Volume 6:Issue 96(2016)
• Page Start: 93496
• Page End: 93504
• Publication Date: 2016-09-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra16008e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Four classes of unsaturated copolyesters of l -lactide were prepared either from isosorbide or bis(hydroxymethyl)tricyclodecane in combination with fumaric acid or from 1, 4-butenediol or 1, 4-butynediol with terephthalic acid. Abstract : Four classes of unsaturated copolyesters of l -lactide were prepared either from isosorbide or bis(hydroxymethyl)tricyclodecane in combination with fumaric acid or from 1, 4-butenediol or 1, 4-butynediol with terephthalic acid. All syntheses were performed in such a way that lactide was oligomerized with a diol as the initiator and the resulting oligomers were polycondensed with a dicarboxylic acid dichloride either in a one-pot synthesis or in a two-step procedure. For most copolyesters the SEC measurements gave weight average molecular weights in the range of 30–60 kg mol −1 and dispersities in the range of 4.2–6.2. The MALDI-TOF mass spectra displayed a high content of cycles and indicated an irreversible kinetic course of all polycondensations. Glass-transition temperatures ( T g ) above 90 °C were only found for two copolyesters of isosorbide. Addition of bromine to copolyesters of 1, 4-butenediol yielded flame retarding biodegradable polymers.