Plastics thermophysical properties

THERMOPHYSICAL PROPERTIES OF PLASTIC MATERIALS AND COMPOSITES TO LIQUID HYDROGEN TEMPERATURE /423 F/. 

THE THERMOPHYSICAL PROPERTIES OF PLASTIC MATERIALS FROM MINUS 50 TO OVER 700 F. PART II. REPTFOR15 JAN. 64 TO 22 JAN. 65. 

Presently in cryogenics, composite polymer materials are widely used. These are glass and carbon plastics based on epoxy and phenolformaldehyde resins. But there are scanty data on their thermophysical properties, and they refer, as a rule, to positive temperatures. 

The dissipation of heat strongly depends on the applied parameters such as the frequency,/, of the electric field strength and its amplitude, E, as well as intrinsic properties of the material such as the loss factor and thermophysical properties of the material, geometrical factors such as the shape and dimensions of the material, and finally the type and nature of the surroundings. On the other hand, this behavior is used extensively to heat industrial materials in the plastics industry, in woodworking, and for drying many insulating materials. 

Lehermeier, H.J., Dorgan, J.R., 2000. Poly(lactic acid) properties and prospect of an environmentally benign plastic melt rheology of linear and branched blends. In Fourteenth symposium on thermophysical properties. 

The entries in Tables 1-4 and 6 are adapted from C. Hall, Polymer Materials, John Wiley Sons, Inc., New York, 1981, p. 88 Modern Plastics Encyclopedia, McGraw-Hill, Inc., New York, 1986 Y. S. Touloukian and co-workers, eds.. Thermophysical Properties of Matter, vols. 2 and 5, 1970, vol. 10, 1973, vol. 13, 1977, Plenum Press, New York R. C. Weast, ed.. Handbook of Chemistry and Physics, 90th ed., CRC Press, Inc., Boca Raton, Fla., 2009 H. Wilski in J. Brandrup and E. H. Immergut, eds.. Polymer Handbook, Wiley-Interscience, New York, 1975, p. III-215. 

Sewell and co workers [145-148] have performed molecular dynamics simulations using the HMX model developed by Smith and Bharadwaj [142] to predict thermophysical and mechanical properties of HMX for use in mesoscale simulations of HMX-containing plastic-bonded explosives. Since much of the information needed for the mesoscale models cannot readily be obtained through experimental measurement, Menikoff and Sewell [145] demonstrate how information on HMX generated through molecular dynamics simulation supplement the available experimental information to provide the necessary data for the mesoscale models. The information generated from molecular dynamics simulations of HMX using the Smith and Bharadwaj model [142] includes shear viscosity, self-diffusion [146] and thermal conductivity [147] of liquid HMX. Sewell et al. have also assessed the validity of the HMX flexible model proposed by Smith and Bharadwaj in molecular dynamics studies of HMX crystalline polymorphs. 

The volximetric weight, a parameter characteristic for the relative contents of both the solid and gas phase in a material, is the fundamental morphological parameter of foamed polymers and is related to all relevant physical properties of foamed plastics such as strength, thermophysical and electric properties. 

In olden days artificial composites are prepared by mechanical blending of polymers and glasses but in these materials polymers are not homogenously dispersed, to overcome this issue we can prepare polymer by using vegetable oils (Okada and Usuki 1995). These vegetable oil synthesized polymers have thermophysical and mecharucal properties Ifom soft plastic and mbbers for hardening of the material (Xia and Larock 2010). 

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