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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