Polyurethane/Clay Nanocomposite Coatings with Organoclay Modified by Organifier Having Multiple Cationic Sites다중 양이온기를 가진 유기화제로 처리된 폴리우레탄/점토 나노복합도막의 물성에 관한 연구

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In this dissertation, organifiers having multiple cationic sites with various molecular weights are synthesized and organoclays are prepared by cation-exchange reaction of montmorillonite with organifiers. Molecular weight of organifiers is varied from 4455.54 to 10326.73 and one, two and four cationic sites of organifiers are prepared. NMR and FT-IR measurements are used to verify the synthesis of organifiers. By the TGA analysis, inorganic contents of organifiers are measured. d-spacing of organoclays are estimated by WAXD and SAXS analysis. SEM is used to observe the size of organoclays and average effective size is calculated by image analysis. 2K-H-2K organoclay showed the largest d-spacing and the best thermal stability and the most amount of organic penetration into clay among prepared organoclays. Prepared organoclays are immersed into DMF and sonication is applied for 10 mins. After the sonication, organoclay is well-dispered and form stable suspension in DMF. Polyurethane/organoclay nanocomposites are synthesized via solution polymerization. With the five kinds of prepared organoclays, polyurethane/organoclay nanocomposites are prepared from 1 wt% up to 3 wt% organoclay loading. Polyurethane/organoclay nanocomposites are characterized by rheometer, TGA, DMTA, WAXD, SAXS, SEM, TEM, GPC, and UTM. Agglomerated residual clays are observed by SEM micrographs and TGA is used to evaluate thermal stability. Organifier of organoclay is extended by reaction with isocyanate through solution polymerization and the increase of molecular weight is estimated by GPC. Enhancement of mechanical properties and glass transition temperature are observed by UTM and DMTA, respectively. Physical crosslinking effect by ions is verified by rheometer measurement and observed by TEM analysis. The greatest properties are observed from polyurethane/2K-H-2K organoclay nanocomposite corresponding to results of organoclay. Ionic crosslinking effect is shown by introducing multi...
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2008
Identifier
296208/325007  / 020043341
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2008.2, [ xii, 82 p. ]

Keywords

Organifier; Organoclay; Nanocomposites; Polyurethane; Clay; 유기화제; 유기화점토; 나노복합; 폴리우레탄; 점토; Organifier; Organoclay; Nanocomposites; Polyurethane; Clay; 유기화제; 유기화점토; 나노복합; 폴리우레탄; 점토

URI
http://hdl.handle.net/10203/29953
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=296208&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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