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Mechanical properties and morphology of impact modified polypropylene-wood flour composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Forest Products Laboratory.
1998 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 67, no 9, 1503-1513 p.Article in journal (Refereed) Published
Abstract [en]

The mechanical properties and morphology of polypropylene/wood flour (PP/WF) composites with different impact modifiers and maleated polypropylene (MAPP) as a compatibilizer have been studied. Two different ethylene/propylene/diene terpolymers (EPDM) and one maleated styrene-ethylene/butylene-styrene triblock copolymer (SEBS-MA) have been used as impact modifiers in the PP/WF systems. All three elastomers increased the impact strength of the PP/WF composites but the addition of maleated EPDM and SEBS gave the greatest improvements in impact strength. Addition of MAPP did not affect the impact properties of the composites but had a positive effect on the composite unnotched impact strength when used together with elastomers. Tensile tests showed that MAPP had a negative effect on the elongation at break and a positive effect on tensile strength. The impact modifiers were found to decrease the stiffness of the composites. Scanning electron microscopy showed that maleated EPDM and SEBS had a stronger affinity for the wood surfaces than did the unmodified EPDM. The maleated elastomers are, therefore, expected to form a flexible interphase around the wood particles giving the composites better impact strength. MAPP further enhanced adhesion between WF and impact-modified PP systems. EPDM and EPDM-MA rubber domains were homogeneously dispersed in the PP matrix, the diameter of domains being between 0.1-1 m.

Place, publisher, year, edition, pages
1998. Vol. 67, no 9, 1503-1513 p.
Research subject
Wood and Bionanocomposites
URN: urn:nbn:se:ltu:diva-8664DOI: 10.1002/(SICI)1097-4628(19980228)67:93.0.CO;2-HLocal ID: 73256f60-0aaf-11dc-9854-000ea68e967bOAI: diva2:981602
Godkänd; 1998; 20070525 (cira)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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