Packet E: Tossup 5

Characteristic ratios can be compiled for these molecules using the rotational isomeric state model. Symmetric “Maltese (10[1])cross” patterns can be observed under polarized light when these molecules form semicrystalline spherulites (-5[1])(“sfir-ROO-lites”). Solutions of these molecules are considered ideal when the Mark–Houwink exponent (10[1])equals one half (10[1])and the theta condition is reached. (10[1]-5[2])The interaction parameter chi (“kai”) is used to (10[1])calculate (10[2])free energies (10[1]-5[1])of mixing (10[1])for solutions of these molecules in the Flory–Huggins model. (10[14]-5[2])Atactic (10[2])examples of these molecules (10[2])usually have (10[1])lowered (-5[1])glass-transition temperatures. (10[1])Epoxy (10[1])resins (10[2])are (10[1])“cured” into the thermoset (10[2])type (10[2])of these (10[1])molecules, (10[4])which are (10[2])alternatively formed by step-growth (10[4])or (10[1])chain-growth (10[8])methods. (10[5])For 10 (10[1])points, name (10[1])these (10[1])molecules (10[1])made of repeating monomers. (10[2])■END■ (10[7])

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