xCH2=C(CH3)-CH=CH2 +yCH2=CH-CN ⇒
⇒ -[-(CH2-C(CH3)=CH-CH2-)x-(CH2-CH(CN)y-]n-
M = 54x + 53y
14y/(54x+53y) ·100 = 4,3 325,58y = 54x + 53y 272,58y = 54x 5y = x
a) x/y = 5
b) nA = 554/68
reactioneaza : 90/100 ·554/68 = 7,33 moli A + 5·7,33 moli B ⇒
⇒ 7,33·(68 +5·53) = 2440,89g copolimer pur
m impur = 2440,89·100/95 = 2569,35g