Question

When do cored structures (grains) form during cooling of an alloy – Equilibrium or non-equilibrium cooling? Why? ..........(4 points) a)Note: Explain what component (higher or lower melting point) forms the core (center) and the boundary (outer edges) of the cored structure (grain)? Draw a single repeat unit of each; polyvinylchloride (PVC) and polystyrene (PS). Which is more likely to be crystalline, linear syndiotactic PVC or linear atactic PS? Briefly explain..... (4 points)

Answer 1

point element will (x - Non- equilibrium con cooling - fast cooling deviates the equilibrium phase formation, because of diffusion is not favourable on fast cooling cooling genity caring y compositional inhomo Como Segregation mettin Start Solidification. last liquid having towar melting point Higher meeting

H H 1 Cl n-I C-C linear syndiotatic Pue pvc fc-70 polystyrene crystallinity: chains arrange into particular arrangement is called crystallinity. Isotalitic > Syndio tatic > atactic cross linear > » Heavity linked. atactic ps due to easily * How easility molecular H crystallinity Ader Branched motely than mobility of lineer chains.