Wood fiber composites properties

Orlando, Fl 7th-l 1th May, 2000, paper 660 EFFECTS OF IMPACT MODIFIERS ON THE PROPERTIES OF RIGID PVC/WOOD-FIBER COMPOSITES... 

V. Hristov and S. Vasileva. Dynamic mechanical and thermal properties of modified poly(propylene) wood fiber composites. Macromol. Mater. Eng., 2003, 288(10), 798-806. 

Raj RG, Kokta D, Daneault C (1989) Effect of chemical treatment of fibers on the mechanical properties of polyethylene-wood fiber composites. J Adhes Sci Technol 3 55-64... 

Coutinho, F.M.B., Costa, T.H.S., Carvalho, D.L., Polypropylene-wood fiber composites effect of treatment and mixing conditions on mechanical properties, I. Appl. Poly. Sci., 65 (6), 1227-1235 (1997). 

The high levels of processing aids in vinyl wood fiber composites should be noted. A study of properties versus level has been reported. The test compound was as ... 

R. G. Raj, and B. V. Kokta, Thermochemical properties of polyethylene wood fiber composites. Acs Symposium Series 489,99-117 (1992). 

Kim, Y.S., Guo, G., Wang, K.H., Park, C.B. and Maine, F.W., Processing/Stracmre/Property Relationships for Artificial Wood Made from Stretched PP/Wood-fiber Composites. SPE, ANTEC, Technical Papers, Paper 809, Chicago, IL (2004). 

The mechanical properties of composites reinforced with wood fibers and PVC or PS as resin can be improved by an isocyanate treatment of those cellulose fibers [41,50] or the polymer matrix [50]. Polymethylene-polyphenyl-isocianate (PMPPIC) in pure state or solution in plasticizer can be used. PMPPIC is chemically linked to the cellulose matrix through strong covalent bonds (Fig. 8). 

Analog-to-glass fibers silanes are used as coupling agents for natural fiber polymer composites. For example, the treatment of wood fibers with product A-175 improves wood dimensional stability [53]. In contrast, a decrease of mechanical properties was observed for coir-UP composites after a fiber modification with di-chloromethylvinyl silane [54]. The treatment of mercer-... 

When used as substitutes for asbestos fibers, plant fibers and manmade cellulose fibers show comparable characteristic values in a cement matrix, but at lower costs. As with plastic composites, these values are essentially dependent on the properties of the fiber and the adhesion between fiber and matrix. Distinctly higher values for strength and. stiffness of the composites can be achieved by a chemical modification of the fiber surface (acrylic and polystyrene treatment [74]), usually produced by the Hatschek-process 75-77J. Tests by Coutts et al. [76] and Coutts [77,78] on wood fiber cement (soft-, and hardwood fibers) show that already at a fiber content of 8-10 wt%, a maximum of strengthening is achieved (Fig. 22). 

Mahlberg, R., Paajanen, L., Nurmi, A., Kivisto, A., Koskela, K. and Rowell, R.M. (2001). Effect of chemical modification of wood on the mechanical and adhesion properties of wood fiber/polypropylene fiber and polypropylene/veneer composites. Holz als Roh- und Werkstoff, 59(5), 319-326. 

Ogawa, T. and Ohkoshi, M. (1997). Properties of medium density fibreboards produced from thermoplasticized wood fibers by aUylation without adhesives. Mokuzai Gakkaishi, 43(1), 61-67. Ogiso, K. and Saka, S. (1993). Wood-inorganic composites prepared by sol-gel process II. Effects of ultrasonic treatments on preparation of wood-inorganic composites. Mokuzai Gakkasihi, 39(3), 301-307. 

MDF Medium-density fiberboard. A composite panel product manufactured from wood fibers and s)mthetic resin binders bonded together under heat and pressure the fibers and resin form a homogeneous board with consistent properties in each direction. 

This specification covers the composition and physical properties of insulating boards composed of wood-fiber insulation board laminated to rigid cellular polystyrene insulation boards, flat or tapered, used principally above structural roof decks for thermal insulation as well as for a base for roofing in building construction. 

Heterogeneous composite materials made from waste or recycled components such as polyolefin polymers and wood fibers were shown to be made compatible by T. Czvikovszky through the use of small amounts of monomers that graft onto the two normally incompatible phases of said mixtures. These compositions demonstrated sufficient material properties to be used in the construction of truck and automotive components, such as door and side panels. To exploit the use of such recycled resources, process techniques in mixing and compounding had to be developed. 

M.M. Stark and R.E. Roland. Effects of wood fiber characteristics on mechanical properties of wood/polypropylene composites. Wood J Fiber Sci., 2003, 35(2), 167-174. 

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