Polymers wood-plastic composites

In addition, ABS that has been recovered can be recycled into high value composites without separation from impurities. This has been exemplified with wood-plastic composites that contain ABS as matrix polymer. Both virgin ABS and recycled ABS were used and the properties of the materials were compared (126). In order to increase the performance, coupling agents were used, all based on grafted maleic anhydride. 

Fifteen years ago, when wood-plastic composites were first introduced many people predicted that this process would solve the problem of wood dimensional stability and great claims were made for its future use. Now that the physical properties of wood-polymer composites are better understood, specific commercial products are being produced which take advantage of the desirable aesthetic appearance, the high compression strength, increased hardness and abrasion resistance and improved dimensional stability. Future use of wood-polymer composites will depend upon the imagination of the producer and the market place. 

Anonymous. Wood-plastic composite growth taking off in Europe... while strong WPC growth continues in the USA.. Additives for Polymers (5) 9—11 (2006). 

Wood-plastic composite specimens (WPG) were prepared by impregnating the oven-dry specimens with a solution of methyl methacrylate containing 1 % a,a -azobisisobutyronitrile as a catalyst, wrapping the specimens in aluminum foil, and curing the polymer at 80°C for 3 h. The structure of pattern (A-5) and (A-6) + (B-6) and (B-9) can be obtained under experimental conditions, but pattern (A-2) and (A-3) + (B-1) can be expected in industrial practice. 

CZVTKOVSKY, TIBOR. Radiation Processing of Wood Plastic Composites. Radiation Processing of Polymers. Hanser Publishers, New York (1992) 121-148. 

CZVIKOVSZKY T., Radiation processing of wood-plastic composites, in Radiation Processing of Polymers, (eds A. SINGH, J. SILVERMAN), Hanser - Oxford Univ.Press, Munich, NewYork, 1992. 

IMPREGNATION OF SOFT SOUND WOOD WITH MONOMERS, which are then polymerized in situ by 7 radiation, was a method used in many laboratories during the 1960s in an effort to obtain wood-plastic composites. The process was attractive in two respects there was a large choice of consolidants, and radiation-induced polymerization had many advantages. Various vinyl monomers are cured by 7 rays. By proper selection of the polymer or copolymer, materials can be tailor made for specific applications. The radiation process presents several advantages over the chemically catalyzed polymerization of monomers in wood. 

Types of Polymers Used in Wood/Plastic Composites Manufacturing... 

Clariant introduces licocene coupling agent for wood-plastic composites. Addit Polym [trade journal—Elsevier] March 2007. 

Ndmberg B, BorchardtE, LuinstraGA, Fromm J. Wood plastic composites from polyfpropylene carbonate) and poplar wood flour—mechanical, thermal and morphological properties. Eur Polym J 2014 51 167-176. 

Singh B, Gupta M, Verma A (1996) Influence of fiber surface treatment on the properties of sisal fiber reinforced polyester composites. Polym Compos 17 910-918 Schirp A, Wolcott M (2005) Influence of fungal decay and moisture absorption on mechanical properties of extruded wood-plastic composites. Wood Fiber Sci 37 643-652 Winfield AG (1979) Jute reinforced polyester project for UNIDO/Govt, of India Blast Rubber Int 4 23-28... 

Chapters 15-18 focus on the weathering/mechanical study of lignocellulosic fiber-reinforced polymer composites. The effect of different environmental conditions on the physico-chemical and mechanical properties of the polymer composites is discussed in detail in these chapters. Chapter 15 mainly focuses on the effect of weathering conditions on the properties of lignocellulosic polymer composites. Most of the focus of this chapter is the effect of UV radiation on different properties of composites. Chapter 16 describes the effect of layering pattern on the physical, mechanical and acoustic properties of luffa/coir fiber-reinforced epoxy novolac hybrid composites, and Chapter 17 summarizes the fracture mechanism of wood plastic composites. Chapter 18 focuses on the mechanical behavior of biocomposites xmder different environmental conditions. 

J.S. Fabiyi, A.G. McDonald, M.P. Wolcott and P.R. Griffiths, Wood plastic composites weathering Visual appearance and chemical changes. Polym. Degrad. Stabil. 93, 1405-1414 (2008). 

Recommended for polymers PMMA, ABS, SAN, HIPS, high efficient light stabilizer for Wood Plastic Composites (PE/PP based WPC) ... 

ExxonMobil Chemical s Exxelor compatibilisers include maleated PP and maleated elastomeric ethylene copolymers. They improve the impact strength of wood plastics composites, but there needs to be at least 50% wood in the composition to see the full effect. They also improve the water absorption and allow the wood content to be increased from 50% to 60%, giving better mechanical properties with no net increase in materials costs. Some of these additives are also recommended for use in polymer blends such as PA/ABS or PA6/PA6-6. 

Clariant is the world s largest manufacturer of ammonium polyphosphate, which is the basis of its Exolit AP halogen-free intumescent flame retardants. They cut down smoke emission, evolve no corrosive gases and are recommended for both thermoplastic (including polyolefin and polyurethane) and thermosetting polymers. Exolit AP 750 is used to make injection moulded PP electrical parts and weatherable items that contain a HALS stabiliser. Ammonium polyphosphate is recommended for certain types of wood-plastic composite. 

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