Modulating the thermal properties of poly(hydroxybutyrate) by the copolymerization of rac-beta-butyrolactone with lactide
2016 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 40, no 9, 7671-7679 p.Article in journal (Refereed) Published
Biobased poly(hydroxybutyrate) is produced by microorganisms under controlled conditions. It is a linear, high molecular weight, fully isotactic and highly crystalline polymer. However, it has poor mechanical and thermal properties. We have modulated the thermal properties of this material by ring-opening co-polymerization of rac-beta-butyrolactone (BL) with lactide (LA) in the presence of salan-based yttrium and aluminum catalysts. The prepared poly(hydroxybutyrate-co-lactide) copolymers were characterized by proton and carbon nuclear magnetic resonance (H-1 and C-13 NMR), size exclusion chromatography (SEC) and differential scanning calorimetry (DSC) analyses. The salan-yttrium compound was a more effective catalyst compared to the aluminum compound, affording high molecular weight copolymers with higher monomer conversion and a monomodal distribution of the molecular weights. The kinetic experiments showed a higher rate of polymerization for the LA with respect to the BL. The copolymers were amorphous and DSC showed unique transition temperatures for all of the samples. The formation of a gradient copolymer is proposed.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 40, no 9, 7671-7679 p.
IdentifiersURN: urn:nbn:se:kth:diva-193865DOI: 10.1039/c6nj00298fISI: 000382820000054ScopusID: 2-s2.0-84985041093OAI: oai:DiVA.org:kth-193865DiVA: diva2:1034492
FunderVINNOVA, 291795Swedish Research Council, 621-2013-3764
QC 201610122016-10-122016-10-112016-10-12Bibliographically approved