Plastics Composition

The present work was done with the aim to evaluate the efficiency of the acoustic emission method as a diagnostic tool for analysing a carbon plastic composite and its adhesive joints. The samples of the carbon plastic type UKN-5000 were used in the test. Non-defected samples and samples with artificial defects were tested. 

G. L. Wiser, "Sierracin Glass/Plastic Composite Wiadshields," presented at Conference on Transparent Materialsfor Aerospace Enclosures, U.S. Air Eorce and University of Dayton, June 25, 1969. 

Whereas the traditional dimethyl siloxane fluids provide very poor lubrication for steel on steel and other common metals, thin films on glass reduce handling damage, small amounts in plastic composites bleed to the surface for self-lubrication, and they provide a superior lubricant for mbber surfaces. 

Exact si2ing of mica products coupled with surface treatment procedures have led to a greater use for wet ground mica in plastic compositions, particularly automobile bodies. These quahty products demand a high dollar value. 

Vjdyne Engineering Plastic Composite Data Sheet, 6313-E, Monsanto Co., St. Louis, Mo. 

S. J. Monte and G. Sugerman, Proceedingsfrom the 33rd Technology Conference, Reinforced Plastics/Composite Institute, Washington, D.C., 1978. 

E. P. P neddem.2inxi, Proceedings of the 24th Hnnual Technological Conference, SPI, Keinforced Plastics Composite Division, SdJ2Lshm.g. on,E).Q., 1969, Paper 19-A. 

A plastic composite is made up of three layers of isotropic materials as follows ... 

The improved physical and mechanical properties of the wood-plastic composites lead to a diversity of applications, e.g., automotive parts, furniture, construction (e.g., building panel, flooring veneers), toys, cutlery handles, industrial pattern, sports equipment, musical... 

K. P. Gohr, Wood Fiber-Plastic Composite Conf., Madison, WI (1993). 

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). 

Cellulose cement composites show a similar sensibility to humidity (Table 14), as do plastic composites, that is, they show a decrease of mechanical properties. Yet, formerly reached values can again be achieved by a drying process on the composite [75]. 

S. Z. Lu, 35th Annu. Tech. Conf. Reinforced Plastic/ Composite Institute, The Society of the Plastic Industry Inc., (1980). 

Table 8. Heats of interaction and physico-mechanical properties of PVC-based filled plasticized compositions [100]...

A form of cooling, and the one of prime interest, concerns ablative cooling. It is essentially a heat and mass transfer process in which mass is expended to achieve thermal dissipation, absorption, and blocking. The process is passive in nature, serves to control the surface temperature, and greatly restricts the flow of heat into the material substrate. As a result of these desirable attributes, ablative cooling (includes use of plastic compositions) has been widely used for thermal protection of solid propellant motors and less extensively in liquid propellant motors. 

The term reinforced plastic (RP), also called composites (more accurately plastic composites), refers to combinations of plastic (matrix) and reinforcing materials that predominantly come in fiber forms such as chopped, continuous, woven and nonwoven fabrics, etc. also in other forms such as powder, flake, etc. They provide significant oriented property and/or cost improvements than the individual components (10, 14, 35, 38, 39-43, 62). 

The term s plastic, polymer, resin, elastomer, and reinforced plastic (RP) are some-what synonymous. However, polymer and resin usually denote the basic material. Whereas plastic pertains to polymers or resins containing additives, fillers, and/or reinforcements. Recognize that practically all materials worldwide contain some type of additive or ingredient. An elastomer is a rubberlike material (natural or synthetic). Reinforced plastics (also called composites although to be more accurate called plastic composites) are plastics with reinforcing additives, such as fibers and whiskers, added principally to increase the product s mechanical properties. 

Plastic also refers to a material that has a physical characteristic such as plasticity and toughness. The general term commodity plastic, engineering plastic, advanced plastic, advanced reinforced plastic, or advanced plastic composite is used to indicate different performance materials. These terms and others will be reviewed latter in this chapter. Plastics are made into specialty products that have developed into major markets. An example is plastic foams that can provide flexibility to rigidity as well as other desired properties (heat and electrical insulation, toughness, filtration, etc.). 

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