Answered: A sample of polystyrene is composed of…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter29: Organic Polymer Chemistry

Section: Chapter Questions

Problem 29.34P: Radical polymerization of styrene gives a linear polymer. Radical polymerization of a mixture of...

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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?

Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

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