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Extruded Wood-Flour Polypropylene Composites: Effect of a Maleated Polypropylene Coupling Agent on Filler-Matrix Bonding and Properties

Published online by Cambridge University Press:  16 February 2011

George E. Myers ,
Paul C. Kolosick ,
Ichwan S. Chahyadi ,
Camden A. Coberly ,
James A. Koutsky  and
Donald S. Ermer
George E. Myers
Affiliation:
USDA Forest Products Laboratory, Madison, WI 53705
Paul C. Kolosick
Affiliation:
University of Wisconsin-Madison, Madison, WI 53706
Ichwan S. Chahyadi
Affiliation:
University of Wisconsin-Madison, Madison, WI 53706
Camden A. Coberly
Affiliation:
University of Wisconsin-Madison, Madison, WI 53706
James A. Koutsky
Affiliation:
University of Wisconsin-Madison, Madison, WI 53706
Donald S. Ermer
Affiliation:
University of Wisconsin-Madison, Madison, WI 53706
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Abstract

Full factorial studies were conducted to determine the effects of a coupling agent (a low molecular weight maleated polypropylene (MAPP)) and other composition and processing variables on the mechanical properties of a wood-flour-filled polypropylene (PP) composite. Effects of MAPP on the bonding between PP and wood veneer were also examined. At less than 1 percent by weight, MAPP produced useful increases in strength and modulus properties of the composite, and this effect was somewhat enhanced by small-particle-size wood flour and multiple extrusions. However, MAPP caused small losses in notched impact energy. High extrusion temperature (190°C to 250°C) had little influence on strength, but it decreased notched impact energy. Peel force between PP and wood veneer was increased by pretreatment with MAPP for aspen, but not for birch, aspen being more porous than birch. The effectiveness of MAPP may therefore be related to its ability to penetrate the wood and form a strongly held hydrophobic layer that is attractive to the PP, thereby increasing both the effective bonding area and mechanical interlocking.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 197: Symposium U – Materials Interactions Relevant to the Pulp, Paper and Wood Industries , 1990 , 67
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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