9A) study on the effect of multi-arm, multi-site organifier on the properties of polyurethane/clay nanocomposite coatings = Multi-arm, Multi-site 유기화제의 폴리우레탄/유기화점토 나노복합 Coating에 대한 연구

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Linear one or two binding sites, three-arm, one binding site and three-arm, three binding sites $(N^+)$ organifiers with two hydroxyl end groups were synthesized. The novel organoclays were prepared through cation exchange reaction between pristine montmorillonite (Na-MMT) and the synthesized organifiers. The effect of the chemical structure and the molecular weight of the organifiers on the properties of the organoclays such as d-spacing and suspension stability in organic solvent were investigated. The effect of different organoclays on the properties of the PU/clay nanocomposites such as morphology, molecular weight, thermal properties, tensile properties and rheological properties was also investigated. In chapter 2, the effect of the chemical structure and the molecular weight of the organifiers on the properties of organoclays were investigated. Higher ion-exchanged fraction (IEF) was observed for one binding site organoclays when compared to the multi binding site organolcays because the one binding sited organifier is easier to penetrate into the silicate layers than multi binding site organifier and/or there is some possibility of just one or two $N^+$ in multi binding sited organifier was attached to the anion of the layered silicate surface. The d-spacing of organoclays increased with increasing the molecular weight of organifiers at the same series due to the increase of its chain length and the formation coil-like structure between the silicate layers. The average sizes of Cloisite 30B and Cloisite Na+ are about 9um while the average sizes of the organoclays are rather big ranging form 67-114um because the clays are surrounded by the sticky organifiers. However, the average sizes of organoclays are reduced to about 1um after sonication in DMF for 10min. Cloisite 30B and Cloisite Na+ could not form the stable suspension in DMF due to the lack of the interaction with DMF while orgaonclays showed suspension stability in DMF because the organifiers a...
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
418847/325007  / 020064509
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2010.2, [ xiii, 99 p. ]

Keywords

Polyurethane; Organoclay; Organifier; Nanocomposite; 나노복합재료; 폴리우레탄; 유기화점토; 유기화제

URI
http://hdl.handle.net/10203/29091
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=418847&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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