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Polystyrene and Butene

1. POYSTYRENE: The monomer structure of polystyrene is shown attached.
a) Would you expect polystyrene to be a stiff or a pliable polymer?
b) What kind of synthesis is used in the production of polystyrene from styrene monomers? Addition polymerization, condensation polymerizaton or anionic polymerization?
c) Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091 x 10^6 g/mol.

2. BUTENE: Butene H2C=CH-CH2-CH3 can be reacted to form isotactic polybutene (PB).
a) Would you expect isotactic polybutene to melt at a higher or lower temperature than atactic polybutene f the same molecular weight?
b) Is isotatic polybutene a thermoplastic or thermoset?
c) What is the value of the degree of polymerization n of isotactic PB with a molecular weigh of 3.091x10^5 g/mol?

3. CHIRALITY: One chirality of CH3CHClCOOH is show attached. Identify the images that exhibit the opposite chirality.

4. GLASS TRANSITION AND MECHANICAL PROPERTIES: Describe how the mechanical properties of a purely amorphous cross-linked polymer above its glass transition temperature differ from the mechanical properties of a purely amorphous cross-linked polymer below its glass transition temperature. Consider properties such as Young's modulus and as well as whether you would expect the polymer to undergo plastic flow or brittle fracture.

Solution Preview

1. A. Stiff B. Addition C. 3091000/104.15 = 29678

2. a. Higher T b. Thermoplastic c. 5520 (309100 / 56)

3. Molecule is S. Opposite chirality R is top right and ...

Solution Summary

The expert examines the monomer structures of polystyrene and butene. The degree of polymerization n of polystyrene with a molecular weight is determined.

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