Preparation of microcapsules with nanostructured membranes using microphase separation of block copolymers = 블록 공중합체 미세 상 분리 현상을 이용한 나노 구조 막을 갖는 마이크로 캡슐의 제조

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Microphase separations of block copolymers have been widely studied in soft matter physics and materials chemistry due to unique morphologies, which depend on their composition, segment-segment interaction parameters, and degree of polymerization. Recently, there are a few reports on phase separation of block copolymers in cylindrical and spherical confining geometries. In this study, we report the microphase separation within the spherical confined geometry for the artificial polymeric microparticles and thin membrane in spherical symmetry for the artificial polymeric vesicles. For this, single and double emulsion droplets were employed, of which shell phase contains blends of symmetric poly(styrene)-block-poly(butadiene)-block-poly(styrene) (PS-b-PB-b-PS) and polystyrene homopolymer (hPS). We found various microphases in the spherical membrane, which depended on the weight fraction of PS chain (f) in the polymer blends. f was varied by the addition of polystyrene homopolymers (hPS) and microphase transition was observed for hPS which have much lower molecular weight than that of PS chains of PS-b-PB-b-PS. As the weight fraction of PS chain is increased, we observed the phase transition from cylinder to onion-like lamellae, cylinder, perforated lamellae and spheres. In addition, the surface property was controlled by amphiphilic diblock copolymer surfactants which have selective affinity with PB block of PS-b-PB-b-PS and the effect of surface preference on the microphase separation of polymer blend in spherical membrane was observed. Also, monodisperse polymer microcapsules were prepared using glass microcapillary device.
Advisors
Yang, Seung-Manresearcher양승만researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
419022/325007  / 020083266
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2010.2, [ ix, 69 p ]

Keywords

confinement effect; phase separation; block copolymers; polymer microcapsule; 폴리머마이크로캡슐; 제한효과; 상분리; 블록공중합체

URI
http://hdl.handle.net/10203/29491
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419022&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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