A random poly(isobutylene-isoprene) copolymer has a number-avera A random poly(isobutylene-isoprene) copolymer has a number-average molecular weight of 200,000 g/mol and a degree of polymerization of 3000. Compute the fraction of isobutylene and isoprene repeat units in this copolymer.
A sheet of steel 1.5 mm thick has nitrogen atmospheres A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200(C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6 ( 10-11 m2/s, and the diffusion flux is found […]
Calculate the number-average molecular weight of a random nitril Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.30; assume that this concentration corresponds to a degree of polymerization of 2000.
Compare the temperature dependence of the conductivity for metal Compare the temperature dependence of the conductivity for metals and intrinsic semiconductors. Briefly explain the difference in behavior.
Compare the manner in which the aggregate particles become bonde Compare the manner in which the aggregate particles become bonded together in clay-based mixtures during firing and in cements during setting.
Compare the effectiveness Compare the effectiveness of quenching in moderately agitated water and oil by graphing, on a single plot, radial hardness profiles for 65-mm (2?1 -in.) diameter cylindrical specimens of an 8630 steel that have been quenched in both media.
Carbon is allowed to diffuse through a steel plate 10 mm thick. Carbon is allowed to diffuse through a steel plate 10 mm thick. The concentrations of carbon at the two faces are 0.85 and 0.40 kg C/cm3 Fe, which are maintained constant. If the preexponential and activation energy are 6.2 × 10−7 m2/s and […]
Cite two important differences between continuous cooling transf Cite two important differences between continuous cooling transformation diagrams for plain carbon and alloy steels.
Cite the indices of the direction that results from the Cite the indices of the direction that results from the intersection of each of the following pair of planes within a cubic crystal: (a) (100) and (010) planes, (b) (111) and (111) planes, and (c) (101) and (001) planes.
Cite three sources of internal residual stresses in metal compon Cite three sources of internal residual stresses in metal components. What are two possible adverse consequences of these stresses?