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Wood Plastic Composites Technology

Wood plastic composites, often used for such things as outdoor decking, are one of the fastest growing components of the wood composites industry. Some projections have suggested that these products, which were used for less than 1 percent of decking in the mid-1990s, may capture 20 percent of that market by 2010.

"Composite products made from wood and plastic are highly desirable for their low maintenance and ability to resist rot," said Kaichang Li, an associate professor in the OSU Department of Wood Science and Engineering. "But their use has been limited because of high cost and low strength, a result of inadequate adhesion between the wood fibers and plastic."

Fundamentally, Li said, this is because wood and plastic are like oil and water, and do not mix well. Wood is hydrophilic – it absorbs water – and plastic is hydrophobic, repelling it. A "compatibilizer," typically a polymer that bridges the interface between the wood and plastic in these products, improves stress transfer and increases their strength and stiffness.

The new wood plastic composites use superior compatibilizers developed in Li's laboratory, and an innovative technology for mixing wood and thermoplastics such as nylons, in which the melting temperature of the plastic is higher than the wood degradation temperature.

With this approach, the new wood-plastic composites can use very inexpensive plastics such as those found in old carpet fibers – about 4.4 billion pounds of which are now wasted every year, going into landfills where they are extremely slow to biodegrade and pose a significant waste disposal problem.

They could also open the door for improved utilization of low-grade woody biomass from needed thinning of Oregon forests, which is increasingly being done to improve forest health and prevent catastrophic wildfire. A better "value added" use for that wood fiber could be important, experts say.

The technology may prompt a major expansion of the wood plastic composite industry into new types of products and uses, experts say. In particular, such products may help further replace wood treated with chemical preservatives, some of which have already been banned due to health and environmental concerns.

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How do I clean and store a plastic gas can?

I have a plastic three-gallon gas can containing a small amount of gas. I am planning to transfer the remaining gas to another can that is nearly full. Once I do that, how can I clean the empty can so that I don't have gas fumes throughout the house? Note that I have to store the can inside as we live in an apartment building and have no outside storage.

once you let it dry out, put some plastic between the spout and the can. that way the plastic has the smell trapped.

Flour power: Mark Hix pays tribute to his grandma's legendary victoria sponge
Sponges bring back so many happy childhood memories – a Victoria sponge and butterfly cakes would be a regular weekly feature on my gran's gold trolley in her living room. I'm not quite sure what purpose the gold trolley served, except that it collected a hell of lot of dust and it also housed the sacred Victoria sponge in its plastic dome. Trolleys were common in the Sixties and Seventies, but ...

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