Investigation of the Interfacial Compatibility of PEG and Thermally Modified Wood Flour/Polypropylene Composites Using the Stress Relaxation Approach

Wood plastic composites (WPC) are a new type of green environmental composites with high performance and added value. In this paper, poplar wood flour was modified with vinyltrimethoxysilane(A-171) to improve the interfacial compatibility and enhance the interfacial bonding between the polar wood flour and nonpolar plastics. Then the modified wood flour was blended with high density polyethylene (HDPE) and prepared composites by extrusion. The effects of amount and solution concentration of A-171 on the properties of WPC were investigated. FTIR analysis indicated that polycondensation grafting reaction occurred between A-171 and wood flour. Compared to untreated wood flour/HDPE composites, both mechanical properties and water resistance of the composites were improved and presented optimal performance when the dosage of A-171 was 4%. The storage modulus G' and viscosity η*of the composites decreased but the loss tangent tanδ increased compared to the untreated composites. G' and η* raised with the increase of A-171, however, tanδ decreased. Solution concentration of A-171 did not show significant effect on the mechanical properties of composites, but water resistance of composites decreased with the increase of solution concentrateon of A-171.

Download Full-text

Stress relaxation of composites made of polypropylene and organo-montmorillonite modified wood flour during water immersion

Holzforschung ◽

10.1515/hf-2016-0116 ◽

2017 ◽

Vol 71 (2) ◽

pp. 163-170 ◽

Cited By ~ 2

Author(s):

Ru Liu ◽

Jinzhen Cao ◽

Yu Chen

Keyword(s):

Stress Relaxation ◽

Immersion Time ◽

Wood Flour ◽

Water Immersion ◽

Weight Ratio ◽

Testing Time ◽

Dimethyl Ammonium Chloride ◽

Dimethyl Ammonium ◽

Increasing Temperature ◽

Modified Wood

Abstract Wood flour (WF) was modified with sodium-montmorillonite (Na-MMT) and didecyl dimethyl ammonium chloride (DDAC) to form an organo-montmorillonite (OMMT) inside WF at different OMMT concentrations from 0.25 to 1%. The modified WF was blended with polypropylene (PP) to produce PP/WF composites at a weight ratio of 1:1 by compression molding. The composites were immersed in water and their stress relaxation behaviors were investigated at 26, 40, and 60°C, respectively. Results: (1) All composites show stress relaxation with increasing compression testing time, indicating that they have pronounced rheological properties. (2) The stress relaxation becomes more severe with increasing temperature and water immersion time. (3) OMMT improves the stiffness of the composites with slower stress relaxation, and the PP/WF0.5% OMMT seems to perform best among all.

Download Full-text

Properties of PEG/thermally modified wood flour/polypropylene (PP) composites

Forestry Studies in China ◽

10.1007/s11632-012-0405-x ◽

2012 ◽

Vol 14 (4) ◽

pp. 307-314 ◽

Cited By ~ 6

Author(s):

Shu-pin Luo ◽

Jin-zhen Cao ◽

Xing Wang

Keyword(s):

Wood Flour ◽

Pp Composites ◽

Thermally Modified Wood ◽

Modified Wood

Download Full-text

Wood particle size influence on water resistance and mechanical properties of thermally modified wood-polypropylene composites

International Wood Products Journal ◽

10.1080/20426445.2018.1493069 ◽

2018 ◽

Vol 9 (2) ◽

pp. 90-95 ◽

Cited By ~ 2

Author(s):

Edgars Kuka ◽

Dace Cirule ◽

Janis Kajaks ◽

Ingeborga Andersone ◽

Bruno Andersons

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Water Resistance ◽

Wood Particle ◽

Polypropylene Composites ◽

Thermally Modified Wood ◽

Modified Wood

Download Full-text

Selected properties of mahogany wood flour filled polypropylene composites: The effect of maleic anhydride-grafted polypropylene (MAPP)

BioResources ◽

10.15376/biores.15.2.2227-2236 ◽

2020 ◽

Vol 15 (2) ◽

pp. 2227-2236

Author(s):

Vedat Çavuş

Keyword(s):

Mechanical Properties ◽

Maleic Anhydride ◽

Wood Flour ◽

Zinc Stearate ◽

Test Results ◽

Composite Manufacturing ◽

Polypropylene Composites ◽

Tensile Impact ◽

Interfacial Compatibility ◽

Scanning Electron

The aim of this study was to produce mahogany (Swietenia macrophylla) wood flour filled polypropylene (both recycled and virgin) composites and to determine the effects of maleic anhydride-grafted polypropylene (MAPP) on the interfacial compatibility, density, and other mechanical properties of the resulting composites. Approximately 40 wt% of mahogany wood flour, and 60 wt% of polypropylene, 3 wt% of MAPP, 1.5 wt% of zinc stearate, and 1.5 wt% of wax were used during composite manufacturing. Test specimens were manufactured using extrusion and injection molding processes. The flexural, tensile, impact, and hardness properties of all specimens were determined. Scanning electron microscopy was used to study the morphology and interfacial compatibility of the filler in prepared composites. The test results showed that MAPP use and the filler rates affected the density and mechanical properties of test specimens.

Download Full-text