Type your question here EX) A polymer sample consists of five different molecula
ID: 798838 • Letter: T
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EX) A polymer sample consists of five different molecular-weight (MW) fractions, each of equal weight. The molecular weight of these fractions increase from 30,000 to 150,000 in increments of 30,000. Determine the number-average MW, weight-average MW and Polydisperse Index of the sample.
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A) Briefly address the typical methods which are suitable for measuring the number-average MW, weight-average MW and MW distribution.
B)In a condensation polymerization for making polyester, if the fractional conversion in an ester interchange reaction is 0.99999, what would be the degree of polymerization (DP) of the polyester produced?
Explanation / Answer
ex)
A)
number-average MW=N1M1+N2M2+N3M3+N4M4+N5M5(/N1+N1+N3+N3+N5)
=(30,000+60,000+90,000+120000+1,50,000)/(5)=9*10^4
B)WEIGHT AVG.MWT= [ N1*M1^2+N2M2^2 +N3M3^2+N4M4^2 N5M5^2]/[N1M1+N2M2+N3M3+N4M4+N5M5]
=[ 30000]^2 +[60000]^2+[90000]^2+[120000]^2+[150000]^2/ (30,000+60,000+90,000+120000+1,50,000)
=110000
A) THE METHODS ARE USED TO CALCULATE number-average MW, weight-average MW and MW distribution.
COLLIGATIVE PROPERTYSCH AS OSMATIC PRESSURE
LIGHT SCATTERING
ULTRACENTRIFUGATION
SEDIMENTATION
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