Fabrication of Microspheres Based on Poly(4-butyltriphenylamine) Blends with Poly(methyl methacrylate) and Block Copolymer by Solvent Evaporation Method
Micron-sized polymer particles from single poly(4-butyltriphenylamine) (PBTPA) homopolymer,
binary polymer blend [PBTPA/poly(methyl methacrylate) (PMMA)], and ternary polymer blend
(PBTPA/PBTPA-b-PMMA/PMMA) via a solvent evaporation method, and the surface morphologies
and inside structure of resulting particles were investigated. Spherical homopolymer particles with
smooth surface were resulted from PBTPA with low molecular weight. In the case of binary blends
(PBTPA/PMMA = 1/1), Janus (low molecular weight) and dumbbell (high molecular weight) type
morphologies were observed. The particles based on ternary blends containing PBTPA-b-PMMA
showed core-shell type morphologies (PMMA; core, PBTPA; shell). Degree of engulfment of PMMArich
domain increased with the content of the block copolymer. The decrease of domain size was
not observed although the block copolymer had a suitable structure as a compatibilizer for the
blend. It was also found that the initial concentration of polymer solution had an effect on the final
morphology.
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