Method for surface modification of crosslinked polymer patterns by using physical grafting

본 발명은 물리적인 접붙이기를 이용한 가교된 고분자 패턴의 표면을 개질하는 방법에 관한 것으로, 보다 상세하게는 가교된 고분자 패턴 및 필름 위에 표면 개질 물질을 흡착시키는 단계, 고분자를 용매로 팽창시켜 표면 개질 물질의 일부가 고분자 패턴 안으로 융화되는 단계, 그리고 용매를 제거하여 다시 팽창된 고분자를 원래 형태로 수축시켜 융화된 표면 개질 물질의 일부가 영구히 고정되는 단계를 포함하는 것을 특징으로 하는 고분자 표면의 개질방법에 관한 것이다. 본 발명은 물리적 접붙임(grafting) 방법으로 높은 흡착력을 갖도록 하여 고분자 표면의 물성을 향상시킬 수 있다. 고분자 표면 개질, 가교된 고분자 패턴, 물리적 접붙임(grafting

프리즘 홀로그래피 식각공정을 이용한 제어 가능한 밴드갭을 갖는 광결정의 제조

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2008.2, [ v, 59 p. ]3-D photonic crystals (PhCs) have been inspiredly studied to control photonic band gaps (PBGs), i.e. reflected light, which are originated from periodically dielectric structures. For soft PBG structures, hydrogel among the polymeric materials has been received much attentions recently because of its tunable optical property, which is induced by gradual or abrupt volume changes under the external stimuli. Also, it is simple to form networks of crossliked hydrogel by photo-polymerization. Meanwhile, holographic interference lithography is a robust tool to create 3-D nanostructures with free-defects by multi-coherent lights. Moreover just by a single light emission, desired pattern can build up over the large area without masks or templates unlike conventional lithography. In this study, the experimental conditions including preparation of hydrogel solution (i.e. ratio of composition of random copolymer, photoacid generator, crosslinker, and solvent), laser exposure dose, and post-exposure baking were optimized for well-defined photonic structures. The fabrication of 3-D porous hydrogel pattern with thermo-sensitivity via a single refracting prism was demonstrated to avoid elaborate beam alignment and total reflection. Based on the unique swelling property of hydrogel as a visco-elatic material, hydrogel PhCs with reversible optical properties have potential applications such as functional microfluidic sensors and adaptive photonic crystal devices. Not only volume changes of structures, but also it showed that modification of surface property by physical grafting could be used for various tunable functions.한국과학기술원 : 생명화학공학과