Study on effect of the clay size on the dispersion morphology and emulsion stability of abs/layered silicate nanocomposites = ABS/층상 실리케이트 나노복합체의 클레이 크기에 따른 분산성과 에멀젼의 안정성에 관한 연구

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In this dissertation, polymer/layered silicate nanocomposites were prepared via in-situ emulsion polymerization using amphiphiles. The polymer selected for this study were ABS (acrylonitrile-butadiene-styrene) copolymer. The dispersion morphology and emulsion stability of the nanocomposites were researched. Water-soluble PVP/MMT nanocomposites were prepared via solution intercalation method. The d spacing of Na-MMT layers were expanded. The result could be assisted by the hydrogen bonding interaction between C=O of PVP and OH on the silicate surface. And ABS/MMT nanocomposites were synthesized via emulsion polymerization. ABS/MMT nanocomposites showed no peak on XRD pattern. From the result, the nanocomposites were exfoliated. Exfoliated ABS/MMT nanocomposites were synthesized via emulsion polymerization. PVP helps the silicates to be exfoliated. ABS/layered silicate nanocomposites were synthesized through an emulsion polymerization with different sizes of silicates. The particle sizes of Laponite, Cloisite-Na and Kunipia-F are about 20~30 nm, 70~150 nm and 300~500 nm, respectively. When ABS was synthesized by the emulsion polymerization in the presence of Laponite and Cloisite-Na, ABS/layered silicate nanocomposite emulsion showed a stable suspension without the precipitation of solid particle. On the other hand, ABS/layered silicate nanocomposite synthesized with Kunipia-F showed the precipitation of large aggregated particles and the phase separation. Smaller sizes of silicates like Laponite and Cloisite-Na than polymerized particle worked as resided barrier preventing the emulsion particle from coagulation. Larger size of silicate like Kunipia-F than emulsion particle was not able to enclose the emulsion particle delicately because of its stiffness and large aspect ratio. The monomers inserted into the intercalated Kunipia-F connected the ABS particles and clay particles. The Kunipia-F particles anchored ABS particles around them inducing the aggreg...
Advisors
Chung, In-Jae정인재
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2008
Identifier
295350/325007  / 020045019
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2008.2, [ viii, 116p. ]

Keywords

nanocomposite; clay; morphology; emulsion; size effect; 나노복합체; 클레이; 분산성; 에멀젼; 사이즈 이펙트; nanocomposite; clay; morphology; emulsion; size effect; 나노복합체; 클레이; 분산성; 에멀젼; 사이즈 이펙트

URI
http://hdl.handle.net/10203/29026
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=295350&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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