why does an injection How much plasticizer with T_g =-80 degree C would have to
ID: 474260 • Letter: W
Question
why does an injection How much plasticizer with T_g =-80 degree C would have to be added to a film of nylon 66 in order for T_g to be 25 degree C? If V = 200 cm^3/mol and X= 0.40. what would be the effect on T_m of this amount of plasticizer? Data: Delta H_N= 301 J/g, P = 1.091 g/cm^3, T_m = 280 degree C, T_g= 50 degree C. Two copolymers of ethylene (CH_2=CH_2) and propylene (CH_2=CHCH_3) have the same ratio of monomers. However, one is rubbery at room temperature and does not stiffen until the temperature is lowered to about -70 degree C. while the other is rather stiff, tough, and opaque at room temperature. Explain the difference. What kind of isomerism might you expect in polymers of 1-butene (CH_2=CHCH_2CH_3)? Which form is likely to be least crystalline? What kind of isomerism do you expect in 1, 4 polymerization of chloroprene (CH_2= CC1CH= CH_2)? Which isomer should be most crystalline? Why does an injection-molded polystyrene protractor show a complicated pattern when viewed in polarized light? Polycaprolactone has T_g = -60 degree C and T_m = +60 degree C. In the study of biodegradability at 25 degree C, it would be desirable to vary the degree of crystallinity, holding all other variables constant. Why is this difficult with poly-caprolactone? Why should it be easier with polyethylene terephthalate). which has T_g = +60 degree C and T_m = 250 degree C? The Gordon-Taylor equation (Eq. 3.20) can represent the glass-transition temperature T_g of a two-component system in terms of weight fractions of components. Show that [(T_g)_1-T]W_1/W_2, =Phi = KT-k(T_g)_2. Plot Phi versus T to get k and (T_g)_2, assuming (T_g)_1 = 113 degree C for the system described by Anderson, who determined transition temperatures for blends of poly (methyl methacrylate). 1. with poly(epichlorohydrin). 2 [60]:Explanation / Answer
3.15
While injecting polystyrene from a point into the mould a complicated pattern can be observed which indicates
the material flow during the process and as a result there is some permanent strain, such regions are highlighted
(or show complicated patterns) when light strikes the surface .
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.