The effects of processing on natural fibres in starch acetate composites

Kalle Nättinen, Heidi Peltola, Bo Madsen, Roberts Joffe

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Composite compounds of triethyl citrate plasticised starch acetate and natural fibres (hemp and flax) were prepared by melt processing in kg scale. Plasticiser contents from 20 to 35 wt% and fibre contents of 10 and 40 wt% were used. The material was injection moulded to tensile test specimens. The effect of process steps, melt viscosity and fibre type on the fibre length was investigated. The lengths of fully processed fibres were determined by dissolving the starch acetate matrix and measuring the length of the remaining fibres by optical microscopy and image analysis. A clear reductive effect of the pelletising and melt processing on the fibre length was noticed. Also a reduction of fibre length along the increasing fibre content and the decreasing plasticiser content was detected. This reduction was originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. Comparison of the fully processed hemp and flax fibres showed that hemp fibres remained longer and fibrillated more than flax fibres, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibres by the processing was improved, on the contrary to the reduced reinforcement efficiency of flax fibres. In addition, the analysis of fibre dispersion and orientation showed a good dispersion of fibres in the matrix, and a predominant orientation in the melt flow direction.
Original languageEnglish
Title of host publicationNovel nanostructured polymeric materials for food packaging and beyond
Subtitle of host publicationInternational Workshop: Book of Abstracts
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages37-37
Number of pages1
ISBN (Electronic)978-951-38-7605-0
ISBN (Print)978-951-38-7604-3
Publication statusPublished - 2011
EventNovel nanostructured polymeric materials for foodpackaging and beyond: International Workshop - Espoo, Finland
Duration: 15 Sep 201116 Sep 2011

Publication series

SeriesVTT Symposium
Number270
ISSN0357-9387

Workshop

WorkshopNovel nanostructured polymeric materials for foodpackaging and beyond
CountryFinland
CityEspoo
Period15/09/1116/09/11

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    Nättinen, K., Peltola, H., Madsen, B., & Joffe, R. (2011). The effects of processing on natural fibres in starch acetate composites. In Novel nanostructured polymeric materials for food packaging and beyond: International Workshop: Book of Abstracts (pp. 37-37). VTT Technical Research Centre of Finland. VTT Symposium, No. 270 http://www.vtt.fi/inf/pdf/symposiums/2011/S270.pdf