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Assessing the thermoformability of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/poly(acid lactic) blends compatibilized with diisocyanates
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2017 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 62, p. 235-245Article in journal (Refereed) Published
Abstract [en]

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a renewable alternative to conventional barrier packaging polymers due to its thermoplastic properties, biodegradability and gas barrier performance but its potential industrial applications are limited by its high price and difficult processability. A thorough study concerning the thermoforming ability of PHBV, and blends with poly(lactic acid) (PLA) incorporating three different diisocyanates as compatibilizers (hexamethylene diisocyanate, poly(hexamethylene) diisocyanate and 1,4-phenylene diisocyanate) is herein presented after component melt blending. A straightforward universal qualitative method is proposed to assess the thermoformability, based on a visual inspection of a thermoformed specimen and the ability to reproduce the mold shape, and the thermoforming window of the material. The results reveal a significant improvement in the thermoforming capacity and a widening of the thermoforming windows as the correct amounts of diisocyanates are incorporated. The barrier properties and the biodisintegrability of the blends was also studied, confirming a predictable slight decrease of the barrier performance when PLA is added, but without negatively affecting the disintegrability under composting conditions with respect to pristine PHBV.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 62, p. 235-245
Keywords [en]
Biodegradability, Biodegradable polymers, Blending, Cyclohexane, Barrier performance, Barrier properties, Composting conditions, Hexamethylene diisocyanate, Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), Qualitative method, Thermoformabilities, Thermoplastic properties, Thermoforming
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-212246DOI: 10.1016/j.polymertesting.2017.06.026ISI: 000411537900030Scopus ID: 2-s2.0-85023633375OAI: oai:DiVA.org:kth-212246DiVA, id: diva2:1133999
Note

QC 20170817

Available from: 2017-08-17 Created: 2017-08-17 Last updated: 2017-10-16Bibliographically approved

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