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Ring-opening homo- and copolymerization of lactones. Part 1. Homo- and copolymerization of racemic β-butyrolactone with ɛ-caprolactone and δ-valerolactone by tetraisobutyldialuminoxane (TIBAO) catalyst

✍ Scribed by Jaïmes, C.; Collet, A.; Giani-Beaune, O.; Schué, F.; Amass, W.; Amass, A.

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 432 KB
Volume: 45
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199801)45:1<5::aid-pi911>3.0.co;2-j

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✦ Synopsis

Copolymers of racemic b-butyrolactone (b-BL) with e-caprolactone (e-CL) (P(BL-co-CL)) and d-valerolactone (d-VL) (P(BL-co-VL)) were prepared by ring-opening polymerization reactions using the commercial aluminoxane catalyst tetraisobutyldialuminoxane (TIBAO). The yields, molecular weights, compositions and crystallinities were determined for both copolymers by gel permeation chromatography (GPC), nuclear magnetic resonance (1H NMR) spectroscopy and di †erential scanning calorimetry (DSC). A detailed study by 13C NMR spectroscopy has been made to determine monomer diad sequence distributions. These results and those of reactivity ratios indicate that the copolymers may consist of compatible blocks of BL units and VL units of variable size.

1998 SCI.

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Ring-opening homopolymerization and copolymerization of lactones. Part 2. enzymatic degradability of poly(β-hydroxybutyrate) stereoisomers and copolymers of β-butyrolactone with ɛ-caprolactone and δ-valerolactone

✍ Jaimes, C; Dobreva-Schué, R; Giani-Beaune, O; Schué, F; Amass, W; Amass, A 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 196 KB

In this study, we have prepared poly([ R,S ] -b-hydroxybutyrate) (P( [ R,S ] -b-HB) or PHB) from [ R,S ] -b-butyrolactone ( [ R,S ] -b-BL), using diþ erent aluminoxane catalyst systems (triethylaluminium/water, triisobutylaluminium/water, trioctylaluminium/water and tetraisobutyldialuminoxane/water)