Explore BrainMass
Share

Explore BrainMass

    Polystyrene and Butene

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    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.

    © BrainMass Inc. brainmass.com October 10, 2019, 5:49 am ad1c9bdddf
    https://brainmass.com/chemistry/polymer-chemistry/polystyrene-butene-519194

    Attachments

    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.

    $2.19