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Physical and thermal properties of medium chain length polyhydroxyalkanoates
Authors: Datiailh, Chris, Ogidi, Franklin, Cicek, Nazim, Levin, David B.
Identifier: CSBE17014
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Published in: CSBE-SCGAB Technical Conferences » AGM Winnipeg 2017 (with CIGR VI Technical Symposium)
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Description: Medium chain length polyhydroxyalkanoates (mcl-PHAs) are naturally occurring polymers produced by various bacteria of the genus Pseudomonas which may find potential applications in plastic markets. These polymers can be cultivated in a bioreactor with renewable carbon substrates and are biodegradable. The composition of mcl-PHAs differ in monomer lengths and functional groups under various growth conditions which ultimately influence the polymer properties. Analysis of mcl-PHA production indicates that compositional differences can be inherited from the choice of bacterial strain, the choice of substrate and growth conditions. These same factors affect the molecular weight, crystallinity and order of the polymers. Taken together, significant differences in polymer properties are observed based on the production conditions for mcl-PHA synthesis. Pseudomonas putida LS46 was used to cultivate mcl-PHAs from various feedstocks. When cultivated using octanoic acid as the substrate, an elastomeric polymer was produced. This polymer had a tensile strength of 2.98 MPa and an elongation at break of 161%. The glass transition point was observed at -36 ?C, melting point as 53?C and the degradation temperature as 249 ?C. In comparison, growth on long-chain fatty acids (LCFAs) present in Canola oil produced polymers demonstrating markedly different properties. The mcl-PHAs produced from LCFAs contain longer monomer units with some unsaturation and as a result are completely amorphous. The glass transition temperature of these polymers -53 C and the degradation temperature observed at 253 C.
Keywords: Renewable biomaterials, Bioplastics, Polyhydroxyalkanoates, Pseudomonas putida
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Date: 2017-08-07
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Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Session 1A: Biopolymers: Production & Properties
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Type: Text.Article
Format: PDF
Publication type: Technical conference
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
DOI:
Description: Medium chain length polyhydroxyalkanoates (mcl-PHAs) are naturally occurring polymers produced by various bacteria of the genus Pseudomonas which may find potential applications in plastic markets. These polymers can be cultivated in a bioreactor with renewable carbon substrates and are biodegradable. The composition of mcl-PHAs differ in monomer lengths and functional groups under various growth conditions which ultimately influence the polymer properties. Analysis of mcl-PHA production indicates that compositional differences can be inherited from the choice of bacterial strain, the choice of substrate and growth conditions. These same factors affect the molecular weight, crystallinity and order of the polymers. Taken together, significant differences in polymer properties are observed based on the production conditions for mcl-PHA synthesis. Pseudomonas putida LS46 was used to cultivate mcl-PHAs from various feedstocks. When cultivated using octanoic acid as the substrate, an elastomeric polymer was produced. This polymer had a tensile strength of 2.98 MPa and an elongation at break of 161%. The glass transition point was observed at -36 ?C, melting point as 53?C and the degradation temperature as 249 ?C. In comparison, growth on long-chain fatty acids (LCFAs) present in Canola oil produced polymers demonstrating markedly different properties. The mcl-PHAs produced from LCFAs contain longer monomer units with some unsaturation and as a result are completely amorphous. The glass transition temperature of these polymers -53 C and the degradation temperature observed at 253 C.
Keywords: Renewable biomaterials, Bioplastics, Polyhydroxyalkanoates, Pseudomonas putida
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2017-08-07
Technical field:
Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Session 1A: Biopolymers: Production & Properties
Other information:
Type: Text.Article
Format: PDF
Publication type: Technical conference
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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