The bifunctionality of poly[(R)-3-hydroxybutyrate] in self-reinforced composite materials |
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| Affiliation: | 1. Institute for Engineering of Polymer Materials and Dyes, Paint and Plastics Department, 50A Chorzowska St., 44-100 Gliwice, Poland;2. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland;1. BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12005 Berlin, Germany;2. University of Applied Sciences Berlin, Luxemburger Str.10, 13353 Berlin, Germany;1. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, 4051381 Concepción, Chile;2. Department of Mechanical Engineering, University of the Basque Country, 48013 Bilbao, Spain;1. Center for Advanced Materials, Qatar University, Doha 2713, Qatar;2. Materials Science and Technology Program, College of Arts and Sciences, Qatar University, Doha 2713, Qatar;3. Qatar Petrochemical Company (QAPCO), Doha 756, Qatar;1. Center of Advanced Elastomer Materials, Beijing University of Chemical Technology, Beijing 100029, PR China;2. Engineering Research Center of Elastomer Materials Energy Conservation and Resources, Ministry of Education, Beijing 100029, PR China;3. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, PR China;4. Analysis and Test Center, Beijing University of Chemical Technology, Beijing 100029, PR China;1. Friedrich-Alexander-University Erlangen-Nürnberg, Institute of Polymer Technology, Am Weichselgarten 9, D-91058 Erlangen, Germany;2. Central South University, State Key Laboratory of High Performance and Complex Manufacturing, Lushan South Road 932, 410083 Changsha, China |
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| Abstract: | The poly[(R)-3-hydroxybutyrate] (PHB) is a highly crystalline, biosourced polymer. The advantages of the PHB are its biodegradability and biocompatibility; however, the brittleness caused by its high crystallinity decreases the application ability of the PHB in comparison with the polyolefins. Excellent results were observed for the reactive extrusion of PHB in the presence of peroxides in many investigations of the modifications of PHB mechanical properties. The disadvantage must be considered to be the thermal degradation of PHB during extended extrusion and its limitation in natural composite preparation. The peroxides are highly reactive with natural fillers, and this causes a decrease of the filler's mechanical properties. Consequently, the reactive extrusion may be a useful tool for the production of additives only. The results we present of this investigation is based on a different material preparation strategy. The two-stage method incorporated additives preparation via reactive extrusion of PHB and the blending of the obtained product with neat PHB. Theself-reinforced composite material obtained in this way revealed significantly higher values of stress and strain compared to neat PHB. The thermal degradation of the PHB matrix was retarded and total crystallinity of the composite was decreased. The materials were characterized using DSC, SEM and SEC techniques. The samples were also investigated employing tensile and impact strength tests. |
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| Keywords: | Mould injection Biopolyester Reactive extrusion PHB |
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