We demonstrate the new fabrication of uniform polymer microparticles exhibiting not only an internal porous structure but also a golf-ball-like dimple pattern on the surface. The method provides a simple route for engineering the physical aspects of microparticles and can also be applied to various polymers that have been a continuous challenge in microparticle engineering. The final appearance of the porous structure interior of the microparticles was determined by the selection of amorphous or semicrystalline polymers. Materials and methods MaterialsPolymers used to fabricate golf-ball-shaped microparticles are poly(D,L-lactide-co-glycolide) (PLGA, D,L-lactide: glycolide ¼ 65:35, h inh : 0.55-0.75 dl g À1 in HFIP, Lactel), poly(methyl

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Poly(3,4-ethylenedioxythiophene) (PEDOT) has good properties as a conductive polymer such as high conductivity, optical transmittance, and chemical stability, while offering relatively weak physicochemical properties. The main purpose of this paper is to improve physicochemical properties such as solvent resistance and pencil hardness of PEDOT. Carboxyl groups in the poly(MMA-co-MAA) polymer chains can effectively crosslink each other in the presence of aziridine, resulting in physicochemically robust PEDOT/poly(MMA-co-MAA) hybrid conductive films. The electrical conductivity, optical properties, and physicochemical properties of the hybrid conductive film were compared by varying the solid content and poly(MMA-co-MAA) portion in the coating precursor solution. From the results, the transparency and surface resistance of the hybrid film show a tendency to decrease with increasing solid content in the coating precursor. Moreover, solvent resistance and hardness were dramatically enhanced by hybridization of PEDOT and crosslinked poly(MMA-co-MAA) due to curing reactions between carboxyl groups. The chemical composition of 30 wt-% of poly(MMA-co-MAA) (MMA:MAA mole ratio 9:1) and 3 wt-% - 5 wt-% of aziridine yields the best physicochemical properties of poly(MMA-co-MAA)/PEDOT hybrid thin films.