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Polymers 2018, 10(8), 826; https://doi.org/10.3390/polym10080826

Branched Polyurethanes Based on Synthetic Polyhydroxybutyrate with Tunable Structure and Properties

1
Department of Commodity Industrial Science and Chemistry, Gdynia Maritime University, 83Morska Street, 81-225 Gdynia, Poland
2
Nanotribology and Nanostructuring of Surfaces, Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany
3
Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sklodowska Street, 41-819 Zabrze, Poland
4
School of Biology, Chemistry and Forensic Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1SB, UK
*
Authors to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 20 July 2018 / Accepted: 22 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue Functional Polyurethanes)
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Abstract

Branched, aliphatic polyurethanes (PURs) were synthesized and compared to linear analogues. The influence of polycaprolactonetriol and synthetic poly([R,S]-3-hydroxybutyrate) (R,S-PHB) in soft segments on structure, thermal and sorptive properties of PURs was determined. Using FTIR and Raman spectroscopies it was found that increasing the R,S-PHB amount in the structure of branched PURs reduced a tendency of urethane groups to hydrogen bonding. Melting enthalpies (on DSC thermograms) of both soft and hard segments of linear PURs were higher than branched PURs, suggesting that linear PURs were more crystalline. Oil sorption by samples of linear and branched PURs, containing only polycaprolactone chains in soft segments, was higher than in the case of samples with R,S-PHB in their structure. Branched PUR without R,S-PHB absorbed the highest amount of oil. Introducing R,S-PHB into the PUR structure increased water sorption. Thus, by operating the number of branching and the amount of poly([R,S]-3-hydroxybutyrate) in soft segments thermal and sorptive properties of aliphatic PURs could be controlled. View Full-Text
Keywords: polyurethane structure; linear and branched polyurethanes; synthetic polyhydroxybutyrate; thermal properties; sorptive properties polyurethane structure; linear and branched polyurethanes; synthetic polyhydroxybutyrate; thermal properties; sorptive properties
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Brzeska, J.; Elert, A.M.; Morawska, M.; Sikorska, W.; Kowalczuk, M.; Rutkowska, M. Branched Polyurethanes Based on Synthetic Polyhydroxybutyrate with Tunable Structure and Properties. Polymers 2018, 10, 826.

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