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28 November, 11:26

Based on the following molecular weight data of polypropylene, determine the degree of polymerization Molecular Weight Range (g/mole) Number Fraction (xi) Weight Fraction (wi) 8,000 - 16,000 0.05 0.03 16,000 - 24,000 0.17 0.08 24,000 - 32,000 0.22 0.18 32,000 - 40,000 0.25 0.35 40,000 - 48,000 0.22 0.27 48,000 - 56,000 0.09 0.09

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  1. 28 November, 11:44
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    785

    Explanation:

    Molecular. X. W

    Weight

    8000-16000 0.05 0.03

    16000-24000. 0.017. 0.08

    24000-32000. 0.22. 0.18

    32000-40000. 0.25. 0.35

    40000-48000. 0.22. 0.27

    48000-56000. 0.09. 0.09

    Mean weight X*M. W*M

    12000. 600. 240

    20000. 3200. 2000

    28000. 6720. 5600

    36000. 10080. 10800

    44000. 8800. 11880

    52000. 3640 3640

    Total=33040g/mol 36240

    Note before repeat molecular weight m = 3*12.01+6*1.008=

    42.08g/mol

    Degree of polymerization = total W*M/w=33040/42.08 = 785
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