Solution Set 9

Solution Set 9 - 9-1First calculate the number of repeating...

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Unformatted text preview: 9-1First calculate the number of repeating units of each component: For Acrylonitrile (C3H3N), mA= 3(12.011) + 3(1.008) + 1(14.007) = 53.064 g/mol Number of molecules = (1000 g)/(53.064 g/mol) = 18.845 mol For Butadiene (C4H6), mB= 4(12.011) + 6(1.008) = 51.092 g/mol Number of butadiene molecules = (1200 g)/(51.092 g/mol) = 23.487 mol For Styrene (C8H8), mS= 8(12.011) + 8(1.008) = 104.152 g/mol Number of styrene molecules = (1500 g)/(104.152 g/mol) = 14.402 mol Total number of all molecules = 18.845 + 23.487 + 14.402 = 56.734 mol The average ABS molecular weight, mABS= fimi= ( )( )( )molg1521047345640214molg092517345648723molg064537345684518/.../.../...++= 17.626 + 21.151 + 26.439 = 65.216 g/mol With degree of polymerization of 800, the ABS molecular weight MABS= (800)(65.216 g/mol) = 52,173 g/mol 9-2Molecular Weight Range (g/mol) Average Mol. Wt. Mi(g/mol) Number Fraction xi xiMi(g/mol) Weight Fraction wi wiMi(g/mol) 8,000 20,000 14,000 0.05 700 0.02 280 20,000 32,000 26,000 0.15 3,900 0.08 2,080 32,000 44,000 38,000 0.21 7,980 0.17 6,460 44,000 56,000 50,000 0.28 14,000 0.29 14,500 56,000 68,000 62,000 0.18 11,160 0.23 14,260 68,000 80,000 74,000 0.10 7,400 0.16 11,840 80,000 92,000 86,000 0.03 2,580 0.05 4,300 (a)The number-average molecular weight mol/g720,47MxMiin==(b)The weight-average molecular weight mol/g720,53MwMiiw==(c)Molecular weight of tetrafluoroethylene (C...
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Solution Set 9 - 9-1First calculate the number of repeating...

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