Experimental evaluation of anisotropy in injection molded polypropylene/wood fiber biocomposites
Number of Authors: 5
2017 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 96, 147-154 p.Article in journal (Refereed) Published
Although the anisotropy of wood fibers is reasonably well established, the anisotropy of injection molded wood fiber composites is not well understood. This work focuses on chemo-thermomechanical pulp (CTMP) reinforced polypropylene (PP) composites. A kinetic mixer (Gelimat) is used for compounding CTMP/PP composites, followed by injection molding. Effects from processing induced orientation on mechanical properties are investigated. For this purpose, a film gate mold was designed to inject composites in the shape of plates so that specimens in different directions to the flow could be evaluated in tensile tests. Observations from tensile tests were complemented by performing flexural tests (in different directions) on discs cut from the injected plates. SEM was used to qualitatively observe the fiber orientation in the composites. At high fiber content, both modulus and tensile strength could differ by as much as 40% along the flow and transverse to the flow. The fiber orientation was strongly increased at the highest fiber content, as concluded from theoretical analysis.
Place, publisher, year, edition, pages
2017. Vol. 96, 147-154 p.
Composite Science and Engineering
Research subject Polymeric Composite Materials
IdentifiersURN: urn:nbn:se:ltu:diva-61943DOI: 10.1016/j.compositesa.2017.02.003ScopusID: 2-s2.0-85014372994OAI: oai:DiVA.org:ltu-61943DiVA: diva2:1073439
Validerad; 2017; Nivå 2; 2017-03-07 (rokbeg)2017-02-102017-02-102017-03-14Bibliographically approved