(A) Study on structure and properties of polypropylene nanocomposites based on layered silicate = 폴리프로필렌/층상구조점토 나노복합체의 구조와 물성에 관한 연구

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In this dissertation, interfacial effects on structure and properties of polypropylene (PP) / organically modified clay (organoclay) nanocomposites with a maleic anhydride functionality were investigated. Maleic anhydride grafted PP (PPgMA) was used as a compatibilizer or a matrix polymer and nanocomposites were prepared via melt intercalation with mechanical shear In chapter 2, we investigated the thermal characteristics of organoclays modified with the different types of alkylammonium ions, namely, dimethyl-dihydrogenated tallow-ammonium (M20A) and bis(2-hydroxyethyl)-methyl tallow-ammonium (M30B).The effects with thermal characteristics on the formation of PP/PPgMA/organoclay nanocomposites were also examined. At an processing temperature -210℃, the alkyl-ammonium ion underwent thermal decomposition, resulting in the change of the characteristics of silicate interlayer - the decrease of an interlayer spacing and hydrophobicity. This change had the large effects on the formation of nanocomposite. In the case of the organoclay with the structure of relatively disordered monolayer and with only aliphatic chains (M20A), the interlayer characteristics remained favorable for the intercalation of PP chains, in spite of thermal decomposition, resulting in the fine dispersion of clay particles. For the organoclay with the structure of lateral bilayer and with polar hydroxyl groups (M30B), however, the interlayer spacing and hydrophobicity decreased, by thermal decomposition, which gave collapsed silicate layers, with small portion of delaminated layers. In chapter 3, in order to increase an interfacial adhesion, the reaction between organoclay and PPgMA was introduced. PPgMA with high molecular weight ($M_w$: 210,000) was used as a matrix polymer. For introduction of reactive group, aminosilane (3-aminopropyltriethoxysilane) was grafted with the hydroxyl group on edges of organoclay. To control the degree of interfacial interaction, we changed the fraction of reactiv...
Advisors
Park, O-Okresearcher박오옥researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
181132/325007 / 000985830
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2003.2, [ viii, 61 p. ]

Keywords

polymer; layered silicate; polypropylene; nanocomposite; interface; 계면; 고분자; 층상구조점토; 폴리프로필렌; 나노복합체

URI
http://hdl.handle.net/10203/28904
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=181132&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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