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Thermomechanical properties of poly(lactic acid) films reinforced with hydroxyapatite and regenerated cellulose microfibers
University of Borås, School of Engineering. (Polymer Group)
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2014 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 131, no 20Article in journal (Refereed) Published
Abstract [en]

Novel composite films constituted of poly(lactic acid) (PLA), hydroxyapatite (HAp), and two types of regenerated cellulose fillers—particulate and fibrous type—were produced by melt extrusion in a twin-screw micro-compounder. The effect of the film composition on the tensile and dynamic mechanical behavior and the HAp dispersion in the PLA matrix were investigated thoroughly. Appearance of crazed regions and prevention of HAp aggregation in the PLA matrix were elucidated in the composites with up to 15 wt % particulate cellulose content, which was the main reason for only slight reduction in the tensile properties, and consequently trivial degradation of their pre-failure energy absorption as compared to neat PLA films. Superior dynamical energy storage capacities were obtained for the particulate cellulose modified composites, while their fibrous counterparts had not as good properties. Additionally, the anisotropic mechanical behavior obtained for the extruded composites should be favorable for use as biomaterials aimed at bone tissue engineering applications.

Place, publisher, year, edition, pages
John Wiley & Sons, Inc. , 2014. Vol. 131, no 20
Keyword [en]
biodegradable composite, polylactic acid, hydroxyapatite, Resursåtervinning
National Category
Materials Chemistry
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-1944DOI: 10.1002/app.40911ISI: 000340239000028Local ID: 2320/14401OAI: oai:DiVA.org:hb-1944DiVA: diva2:870022
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-10-15Bibliographically approved

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