Experimental study of fiber length and orientation in injection molded natural fiber/starch acetate composites

Heidi Peltola, B. Madsen, R. Joffe, Kalle Nättinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

Composite compounds based on triethyl citrate plasticized starch acetate and hemp and flax fibers 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 processing, melt viscosity and fiber type on the fiber length was investigated. The lengths of fully processed fibers were determined by dissolving the matrix and measuring the length of the remaining fibers by microscope analysis. A clear reductive effect of the processing on the fiber length was noticed. A reduction of fiber length along the increasing fiber content and the decreasing plasticizer content was also detected. This reduction originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. Hemp fibers were shown to remain longer and fibrillate more than flax fibers, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibers by the processing was improved, in contrast with 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.
Original languageEnglish
Article number891940
Number of pages7
JournalAdvances in Materials Science and Engineering
Volume2011
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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Natural fibers
Starch
Fibers
Composite materials
Flax
Hemp fibers
Plasticizers
Processing
starch acetate
Viscosity
Hemp
Cannabis
Aspect ratio
Reinforcement

Cite this

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title = "Experimental study of fiber length and orientation in injection molded natural fiber/starch acetate composites",
abstract = "Composite compounds based on triethyl citrate plasticized starch acetate and hemp and flax fibers 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 processing, melt viscosity and fiber type on the fiber length was investigated. The lengths of fully processed fibers were determined by dissolving the matrix and measuring the length of the remaining fibers by microscope analysis. A clear reductive effect of the processing on the fiber length was noticed. A reduction of fiber length along the increasing fiber content and the decreasing plasticizer content was also detected. This reduction originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. Hemp fibers were shown to remain longer and fibrillate more than flax fibers, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibers by the processing was improved, in contrast with 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.",
author = "Heidi Peltola and B. Madsen and R. Joffe and Kalle N{\"a}ttinen",
year = "2011",
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language = "English",
volume = "2011",
journal = "Advances in Materials Science and Engineering",
issn = "1687-8434",
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Experimental study of fiber length and orientation in injection molded natural fiber/starch acetate composites. / Peltola, Heidi; Madsen, B.; Joffe, R.; Nättinen, Kalle (Corresponding Author).

In: Advances in Materials Science and Engineering, Vol. 2011, 891940, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental study of fiber length and orientation in injection molded natural fiber/starch acetate composites

AU - Peltola, Heidi

AU - Madsen, B.

AU - Joffe, R.

AU - Nättinen, Kalle

PY - 2011

Y1 - 2011

N2 - Composite compounds based on triethyl citrate plasticized starch acetate and hemp and flax fibers 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 processing, melt viscosity and fiber type on the fiber length was investigated. The lengths of fully processed fibers were determined by dissolving the matrix and measuring the length of the remaining fibers by microscope analysis. A clear reductive effect of the processing on the fiber length was noticed. A reduction of fiber length along the increasing fiber content and the decreasing plasticizer content was also detected. This reduction originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. Hemp fibers were shown to remain longer and fibrillate more than flax fibers, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibers by the processing was improved, in contrast with 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.

AB - Composite compounds based on triethyl citrate plasticized starch acetate and hemp and flax fibers 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 processing, melt viscosity and fiber type on the fiber length was investigated. The lengths of fully processed fibers were determined by dissolving the matrix and measuring the length of the remaining fibers by microscope analysis. A clear reductive effect of the processing on the fiber length was noticed. A reduction of fiber length along the increasing fiber content and the decreasing plasticizer content was also detected. This reduction originated from the increasing shear forces during compounding, which again depended on the increased viscosity of the material. Hemp fibers were shown to remain longer and fibrillate more than flax fibers, leading to higher aspect ratio. Thus, the reinforcement efficiency of hemp fibers by the processing was improved, in contrast with 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.

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DO - 10.1155/2011/891940

M3 - Article

VL - 2011

JO - Advances in Materials Science and Engineering

JF - Advances in Materials Science and Engineering

SN - 1687-8434

M1 - 891940

ER -