By Osswald T.A., Hernandez-Ortiz J.P.
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Additional resources for Polymer Processing
10) where C1 and C2 are material dependent constants. 6, eqn. 10) ﬁts well for a wide variety of polymers as long as the glass transition temperature is chosen as the reference temperature. These values for C1 and C2 are often referred to as universal constants. Often, the WLF equation must be adjusted until it ﬁts the experimental data. Master curves of stress relaxation tests are important because the polymer’s behavior can be traced over much greater periods of time than those determined experimentally.
Der Deutschen Chem. , 63:222, 1930. 13. W. van Krevelen. Properties of Polymers. Elsevier, Amsterdam, 1990. 14. L. F. D. Ferry. J. Amer. Chem. , 77:3701, 1955. CHAPTER 2 PROCESSING PROPERTIES Did you ever consider viscoelasticity? 1 THERMAL PROPERTIES The heat ﬂow through a material can be deﬁned by Fourier’s law of heat conduction. 1) where qx is the energy transport per unit area in the x direction, kx the thermal conductivity and ∂T /∂x the temperature gradient. 2) where ρ is the density of the material, Cp the speciﬁc heat, and ∆T the change in temperature.
The pellets must be dried before molding. Low viscosity Polyamide 6 grades can be used to injection mold many thin-walled components. High viscosity grades can be used to injection mold various engineering components such as gears, bearings, seals, pump parts, cameras, telephones, etc. Its mechanical properties are signiﬁcantly enhanced when reinforced with glass ﬁber. Polycarbonate (PC). Polycarbonate is an amorphous thermoplastic known for its stiffness, toughness and hardness over a range from -150o C to 135oC.
Polymer Processing by Osswald T.A., Hernandez-Ortiz J.P.