Download PDF by S. Chow (auth.), John F. Oliver (eds.): Adhesion in Cellulosic and Wood-Based Composites

By S. Chow (auth.), John F. Oliver (eds.)

ISBN-10: 1468489836

ISBN-13: 9781468489835

ISBN-10: 1468489852

ISBN-13: 9781468489859

Cellulose is a flexible and renewable normal source which has attracted expanding awareness within the final decade, expecially after the power challenge of 1973. except its vast use as asolid product, wooden is an important resource of cellulose fibres for papermaking and is usually ordinary as a resource of power. the shape and availability ot· the woodland presents a superb opportunity for technological development and innovation sooner or later to meet the foreseeable expanding call for for wooden­ dependent items. for instance, North American sawmills and plywood turbines shortly get better in basic terms approximately forty five to fifty five% of logged wooden whereas the rest is disposed as waste, whether it is no longer utilized in pulp production. moreover, most sensible and department wooden, and logs from non-commercial species that are almost immediately no longer recovered from the logging websites may supply an considerable and comparatively reasonably cheap source for the manufacture of composite items. different important power bitter ces of cellulosic fabrics are waste paper and agricultural waste. A composite is the consolidation of 2 polymerie fabrics such that one of many parts acts because the adhesive binder whereas the opposite kinds the substrate matrix. every so often, the matrix and the adhesive could be the similar fabrics. to maximise the adhesion capability of the composite, the homes of the substrate that can improve, prevent or complicate the advance of optimal adhesion could be completely explored and identified.

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Theory of mechanical properties of fibrestrengthened materials. I. Elastic behaviour. ~. Mech. Phys. So lids 12:199-212. Jaswon, M. , Gillis, P. , a~d Mark, R. E. 1968. The elastic constants of crystalline native cellulose. ~. Roy. Soc. (London) A 306:389-412. Mar~R. E. 1972~ Mechanical behavior of the molecular components of fibers, in: "Theory and Design of Wood and Fiber Composite Materials:" B. A. , Syracuse Univ. Press 49-82. , 1978. Anisotropy of dielectric constant in coniferous wood. Holzforsch.

Tat ion of a segment of a conifer tracheid surrounded by 6 other tracheids, showing primary and secondary walls. Diagrammatic representation of dominant helical patterns in layers of a wood fiber. has 3 principal secondary layers,each composed of aseries of thin sheets, or laminae. Other cell types might have a greater or lesser number of layers (examples: in some species of spruce, 53 may be absent or vanishingly thin; bamboos often have more than 3 layers), but the pattern of helically-arranged microfibrillar structure is about universal in plants.

Preparation of a Phenol-Formaldehyde Novolak Polymer Syntheses, Vol. ll, Sandler and Karo, Academic Press, 1977. Epoxies. These matf~rials polymerize and cross-link through a number of reaction mechanisms. For wood gluing the amine induced hardening, as shown in Fig. 7, is preferred because it can be made to proceed at room temperature and does not result in acidic glue lines. In general, the epoxies have not found good acceptance in the wood gluing industry. There are several problem areas. Due to the mass/exotherm effect, epoxies tend to have very short pot- lives in mass while 61 STRUCTURAL WOOD ADHESIVES - TODAY AND TOMORROW fH 3 C -o-~ O-CH -CH-CH 'Z /CH-CH 2 -O{)-~ _ I _ 2" / 2 CH - o CH 0 3 + H- NH ---------NH-H j -CH-CH-0-o~ ,2 / 2 CH "0 - Fig.

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Adhesion in Cellulosic and Wood-Based Composites by S. Chow (auth.), John F. Oliver (eds.)

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