Abstract
Poly(4-vinylpyridine) (P4VP) blocks in solvent-cast films of poly(styrene-b-butadiene-b-4-vinylpyridine) (SBP) three-block polymers were quarternized by a vapor phase reaction with CH3Br at 70°C (0.4 to 0.7 atm). The yield was nearly 100%. No changes in morphology were observed before or after quarternization in any SBP specimens cast from different solvents and hence of different morphology. The temperature-complex moduli curves of all the specimens in which isolated P4VP domains are wrapped with polybutadiene (PB) blocks surrounded by the polystyrene (PS) matrix (a “ball-in-a-box” morphology) received no effects from quarternization. Both unquarternized and quarternized specimens with this morphology exhibited only two mechanical transitions due to PB and PS phases (about 190 and 370 K, respectively). The unquarternized specimens having continuous P4VP domains (“three-layer-lamellar” morphology) exhibited three transitions due to the three components, and the quarternization significantly increased dynamic moduli above the glass transition temperature (430 K) of the P4VP phase.
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