Woods, properties

There are similarities between the biological actions of inhalants and those of alcohol and barbiturates (Bowen et al. 1996b). For example, acute administration of inhalants affects motor coordination (Moser and Balster 1981) and induces anxiolysis, whereas chronic administration is associated with physical dependence and withdrawal (Bowen et al. 1996a Evans and Balster 1991, 1993). In addition, some inhalant drugs have anticonvulsant properties (Wood et al. 1984). Like other CNS-depressant agents, inhalants have biphasic effects on spontaneous locomotor activity in rodents, with increased activity seen at lower doses and diminished locomotion seen at higher doses (Cause et al. 1985 Kjellstrand et al. 1985). 

Saka, S. and Ueno, T. (1997). Several Si02 wood-inorganic composites and their fire-resisting properties. Wood Science and Technology, 31(6), 457-466. 

Yasuda, R. and Minato, K. (1994). Chemical modification of wood by non-formaldehyde cross-linking agents. Part 1. Improvement of dimensional stability and acoustic properties. Wood Science and Technology, 28(2), 101-110. 

Some research has been done on the addition of polar solvents to the nonpolar monomer in an attempt to swell the cell wall structure and anchor it in a swollen state (9). This can be done and the antishrink efficiency (ASE) does increase, but after the solvent evaporates, the wood is only partially loaded which in turn decreases the physical properties. Wood-polymer composites normally have about 10-15% ASE, which means that there is some penetration of the cell wall structure to reduce the swelling over that of untreated wood. 

Procedure and Properties Wood Laminates Wood Chips... 

Physical and other properties Wood content of plastic-like crosslinked wood board ... 

A phase is a restricted part of a system with distinct physical and chemical properties (Wood and Fraser 1976). A phase can also be defined as a physically and chemically homogeneous portion of a system with definite boundaries (Brownlow 1979). These attributes mean that a phase should be mechanically separable from a system. Example phases are minerals and well-mixed gases and liquids. Not true phases, because they are comprised of more than one mineral, are rocks such as granite or minerals such as the feldspars when they are chemically zoned and have spatially variable compositions. 

Brown Rot. Brown rots can assimilate only carbohydrates. Decay generally begins in the Sg layer of the cell wall, which provides the greatest concentration of cellulose without lignin. Assimilation of the Si and S3 layers follows. The loss of cellulose reduces or eliminates axial properties. Wood becomes brittle and subject to mechanical failure across the grain (Figure 5). 

Lactucarium, the dried latex of wild lettuce (typically, L. virosa), is a brown substance that physically resembles opium and is sometimes referred to as "lettuce opium." While several historical texts have noted "narcotic" properties of lactucarium (Felter and Lloyd 1898 Scudder 1898), the U.S. Dispensatory notes, "we believe that the general experience is in accord with our own in finding it to be almost devoid of narcotic properties" (Wood and LaWall 1918). Although early investigation indicated the presence... 

The focus in testing was to describe briefly the vast number of tests available to determine tensile, shear, peel, fatigue, creep, and impact properties. Wood, metal, plastic, and fiber-reinforced composite adherends were considered. Attention was also given to precautions which must be taken to obtain valid results. 

In the construction of machines, plant and products, materials are selected because they have particular physical and chemical properties. Wood, metals, concrete, plastics and other substances all have their uses but there are limitations as to what they can do and how long they can do it. Properties may change with use, temperature, operating atmosphere, contamination by surrounding chemicals and for many other reasons. It is necessary to know the properties of the materials and how and why they have been used so that an assessment can be made of whether likely changes in the properties may give rise to hazards. 

The thermosetting coatings exhibited excellent protective and decorative properties. Wood-plastic combinations prepared by this procedure exhibited excellent dimensional stability and other properties, due to significant condensation reaction of the anhydride groups with cellulosic hydroxyl residues. 

Copolymers of propylene and hexene with MA, as shown in Table A.3, are also useful for preparing many products. Thermosetting resins prepared from the 1-hexene copolymer and epoxy resins may be fabricated into laminates with high heat distortion, good solvent resistance, and other attractive properties. Wood composites made with the same blend of alternating copolymer and epoxy resins are also potentially highly useful wood-plas-tics. Propylene-MA copolymers show great utility to prepare blends and laminates from polyolefin-nylon combinations. 

---