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

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

Cellulose is a flexible and renewable normal source which has attracted expanding realization within the final decade, expecially after the strength hindrance of 1973. except its broad use as asolid product, wooden is crucial resource of cellulose fibres for papermaking and is additionally generic as a resource of power. the shape and availability ot· the wooded area presents a good chance for technological development and innovation sooner or later to fulfill the foreseeable expanding call for for wooden­ dependent items. for instance, North American sawmills and plywood generators shortly recuperate purely 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. furthermore, most sensible and department wooden, and logs from non-commercial species that are shortly now not recovered from the logging websites may supply an considerable and comparatively low-cost source for the manufacture of composite items. different useful 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 power of the composite, the houses of the substrate that can improve, prevent or complicate the improvement of optimal adhesion will be completely explored and identified.

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Extra info for Adhesion in Cellulosic and Wood-Based Composites

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Which is too acute for an 06 - H"'Ol' hydrogen bond to form. Accordingly. the most recent crystallographic structure studies indicate that the hydrogen bonding network is completely contained in the (020) plane and that there is no hydrogen bonding along the unit cell diagonals or along the ~ axis. One can thus think of the cellulose I crystal as being composed of plates of chains joined laterally by hydrogen bonds, with van der Waals contacts as the attractive forces between successive plates.

The intrachain hydrogen bonds run along both sides of each chain and are shown in Fig. 16 to form (a) between the 03 oxygen of one glucose residue and the 05 oxygen of the next residue. and (b) between the 06 oxygen of one residue and the 02 oxygen of the next. The respective lengths of these hydrogen bonds. from X-ray diffraction and infrared dichroism data. 287 nm. The interchain hydrogen bond. 279 nm. the likelihood that an interchain 01 to 06 bond exists is discounted by these recent studies.

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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