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A sample of polystyrene is composed of a series of fractions of different sized molecules. a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed? b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol.  c)What would be the potential polymerisation pathways you may follow to polymerise this polymer d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system. e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?

A sample of polystyrene is composed of a series of fractions of different sized molecules. a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed? b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol.  c)What would be the potential polymerisation pathways you may follow to polymerise this polymer d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system. e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter10: Fuels, Organic Chemicals, And Polymers
Section: Chapter Questions
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A sample of polystyrene is composed of a series of fractions of different sized molecules.

a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed?

b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol. 

c)What would be the potential polymerisation pathways you may follow to polymerise this polymer

d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system.

e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?

 

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