Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Effects of silane on the properties of wood-plastic composites with polyethylene-polypropylene blends as matrices

Source: Journal of Applied Polymer Science, Volume 119, 1398-1409 (2011)

Author(s)Clemons, Craig M.; Sabo, Ronald C.; Kaland, Michael L.; Hirth, Kolby C.

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-2A

Abstract: The influence of 3-(trimethoxysilyl)propyl methacrylate and benzoyl peroxide on gel content, crystallinity, and mechanical performance of unfilled PP-PE blends, and their composites with wood was investigated. All materials were compounded in a twin screw extruder and then injection molded. Specimens were then exposed to high-humidity and elevated temperature in a humidity chamber to cross-link any unhydrolyzed silane. Adding wood to the PE-PP blends, increased premature cross-linking but also increased gel contents. However, the gel contents of the composites were still low. The PP component did not appear to cross-link well and our gels were almost entirely HDPE. Fourier Transfer Infrared (FTIR) spectra provided additional evidence that TMSPM is grafted and cross-linked in unfilled PE-PP blends. Unfortunately, the spectra of wood composites proved difficult to interpret because of the complexity and overlap of the FTIR spectra of the wood. The HDPE component annealed when exposed to high-humidity and elevated temperature, although less so in samples with high-gel contents, presumably because of the decreased mobility. Annealing influenced mechanical performance, especially increasing moduli. Adding peroxide and silane appeared to improve adhesion between the wood flour and matrix in the composites but had little effect on energy absorbed during high-speed puncture tests. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1398-1409, 2011

Keywords: Composite materials; mechanical properties; injection molding of plastics; thermoplastic composites; plastics; extrusion; wood-plastic composites; silane; testing; extrusion process; crosslinking; polyethylene; matrices; polypropylene; temperature; humidity; Fourier transform infrared spectroscopy; spectrum analysis; adhesion; peroxides; wood flour; wood plastic materials; crystallinity; biocomposites; silanes; benzoyl peroxide; HDPE; high density polyethylene; reactive extrusion

Publication Review Process: Formally Refereed

File size: 682 kb(s)

Date posted: 10/17/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 40126
Current FPL Scientists associated with this product (listed alphabetically)
Clemons, Craig M.
Materials Research Engineer
Sabo, Ronald C.
Research Materials Engineer

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »

Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »

Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »

Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »