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Experimental study of the fiber length and orientation in injection molded natural fiber/starch acetate composites
VTT Technical Research Centre of Finland, Espoo.
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-5210-4341
VTT Technical Research Centre of Finland, Espoo.
2011 (English)In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, Vol. 2011Article in journal (Refereed) Published
Abstract [en]

Composite compounds based on triethyl citrate plasticized starch acetate and natural fibers (hemp and flax) were prepared by melt processing. Plasticizer contents from 20 to 35 wt% and fiber contents of 10 and 40 wt% were used. The compounded composites were injection molded to tensile test specimens. The effect of process steps, melt viscosity and fiber type on the fiber length was investigated. The lengths of fully processed fibers were determined by dissolving the starch acetate matrix and measuring the length of the remaining fibers by optical microscopy and image analysis. A clear reductive effect of the pelletising and melt processing on the fiber length was noticed. Also a reduction of fiber length along the increasing fiber content and the decreasing plasticizer content was detected. This reduction was originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. When comparing the fully processed hemp and flax fibers, hemp fibers remained longer and fibrillated more than flax fibers, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibers by the processing was improved, on the contrary to the reduced reinforcement efficiency of flax fibers. In addition, the analysis of fiber dispersion and orientation showed a good dispersion of fibers in the matrix, and a predominant orientation of the fibers in the melt flow direction.

Place, publisher, year, edition, pages
2011. Vol. 2011
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-6854DOI: 10.1155/2011/891940ISI: 000296804300001Scopus ID: 2-s2.0-81555215678Local ID: 52a33a20-0c88-4e40-8521-4684acebcb7aOAI: oai:DiVA.org:ltu-6854DiVA, id: diva2:979740
Note
Validerad; 2011; Bibliografisk uppgift: Article ID 891940; 20110627 (joffe)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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