q12asol - which has a molecular weight of | | H CH 3 (4 12...

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3.091 Fall Term 2004 Homework Quiz #12A solution outline (a) Isobutylene, shown above to the left, can be reacted by addition polymerization to form polyisobutylene. Draw a segment of polyisobutylene showing three repeat units. H CH 3 H CH 3 H CH 3 | | | | | | – C – C – C – C – C – C – | | | | | | H CH 3 H CH 3 H CH 3 (b) What is the degree of polymerization, n , of polyisobutylene that has a molecular weight of 3.091 × 10 5 g/mol? H CH 3 | | the mer unit is – C – C –
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Unformatted text preview: which has a molecular weight of | | H CH 3 (4 12 for C) + (8 1 for H) = 56 g/mol n = 3.091 10 5 g/mol / 56 g/mol = 5520 (c) Is polyisobutylene a thermoset or a thermoplastic? Explain. Polyisobutylene is a thermoplastic. It is a linear chain molecule. Only weak van der Waals bonds hold the solid together. Raising the temperature will loosen these bonds and allow the chains to flow without damage to the covalently bonded primary structure....
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