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Title: | Extrusion and Injection Molding of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate) (PHBHHx): Influence of Processing Conditions on Mechanical Properties and Microstructure | Authors: | VANHEUSDEN, Chris SAMYN, Pieter Goderis, Bart Hamid, Mouna REDDY, Naveen ETHIRAJAN, Anitha PEETERS, Roos BUNTINX, Mieke |
Issue Date: | 2021 | Publisher: | MDPI | Source: | Polymers, 13 (22) (Art N° 4012) | Abstract: | Biobased and biodegradable polyhydroxyalkanoates (PHAs) have great potential as sustainable packaging materials. However, improvements in their processing and mechanical properties are necessary. In this work, the influence of melt processing conditions on the mechanical properties and microstructure of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is examined using a full factorial design of experiments (DoE) approach. We have found that strict control over processing temperature, mold temperature, screw speed, and cooling time leads to highly increased elongation at break values, mainly under influence of higher mold temperatures at 80 °C. Increased elongation of the moldings is attributed to relaxation and decreased orientation of the polymer chains together with a homogeneous microstructure at slower cooling rates. Based on the statistically substantiated models to determine the optimal processing conditions and their effects on microstructure variation and mechanical properties of PHBHHx samples, we conclude that optimizing the processing of this biopolymer can improve the applicability of the material and extend its scope in the realm of flexible packaging applications. | Keywords: | DoE;crystallization;elongation at break;extrusion;injection molding;mechanical properties;melt processing;poly(3-hydroxybutyrate-co-3-hydroxyhexanoate;polyhydroxyalkanoates | Document URI: | http://hdl.handle.net/1942/36214 | e-ISSN: | 2073-4360 | DOI: | 10.3390/polym13224012 | ISI #: | WOS:000725214900001 | Rights: | 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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polymers-13-04012-v2-Vanheusden.pdf | Published version | 4.22 MB | Adobe PDF | View/Open |
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