화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2018년 봄 (04/04 ~ 04/06, 대전컨벤션센터)
권호 43권 1호
발표분야 고분자가공/복합재료
제목 Self-Assembled Shape-Anisotropic Block Copolymer Particles from Evaporative Emulsions
초록 Theoretical prediction and systematic modulation of shape-anisotropy of polymeric particles is of great importance in tuning their shape-dependent properties. Here, we demonstrate a precise control of aspect ratio (AR) of convex lens-shaped block copolymer (BCP) particles from the solvent evaporation-driven self-assembly of BCPs within emulsion droplet. Convex lens-shaped PS-b-P4VP particles were produced in the range of several hundred nanometers to a few microns, where the particles having a major axis diameter of 5 μm showed extremely flat shape with an AR of 15 or more. To understand the formation of anisotropic shape, a simple free energy model that embodies the competition between bulk elasticity of BCP cylinders and particle/medium interfacial energy was developed. Importantly, a deep insight into the entropic energy originating from the conformational change of the polymer chain upon particle deformation was performed according to the variation of BCP structure.
저자 구강희1, 김용주2, 이영준2, 신재만2, 김범준2
소속 1한국과학기술원(KAIST), 2KAIST
키워드 block copolymer; anisotropic particle; convex lens; PS-b-P4VP; emulsion
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