Materials Eng EGN 3365
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This 1 page Class Notes was uploaded by Amparo Bins DVM on Monday October 12, 2015. The Class Notes belongs to EGN 3365 at Florida International University taught by Jiuhua Chen in Fall. Since its upload, it has received 15 views. For similar materials see /class/221782/egn-3365-florida-international-university in General Engineering at Florida International University.
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Date Created: 10/12/15
1419 a This portion of the problem asks us to determine the ratio of butadiene to acrylonitrile repeat units in a copolymer having a weightaverage molecular weight of 250000 gmol and a degree of polymerization of 4640 It first becomes necessary to calculate the average repeat unit molecular weight of the copolymer m using 250000gmol 5388gm01 7M 7 4640 Equation 146 as n DP r If we designate fb as the chain fraction of butadiene repeat units since the copolymer consists of only two repeat unit types the chain fraction of acrylontrile repeat units fa is just 1 7 Now Equation 147 for this copolymer may be written in the form W fbmb fama fbmb 1 7fbma in which mb and ma are the repeat unit molecular weights for butadiene and acrylontrile respectively These values are calculated as follows mb 4AC 6AH 41201gmol 61008 gmol 5409 gmol ma 3AC 3AH AN 31201gmol 31008 gmol 1401 gmol 5306 gmol Solving for fb in the above expression yields W 7 m fb a 5388 gmol 5306 gmol 080 mb 7 ma 5409 gmol 7 5306 gmol 40 0 so 0 ll 0 N o Furthermorefa 1 7fb 1 7 080 02039 or the ratio is just fb f b Of the possible copolymers the only one for which there is a restriction on the ratio of repeat unit types is alternating the ratio must be 11 Therefore on the basis of the result in part a the possibilities for this copolymer are random graft and block
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