(The) study on preparation and characterization of maleated polyethylene/silicate nanocomposites = 무수 말레인산이 그라프트된 폴리에틸렌 나노 복합체의 제조 및 특성 연구

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Polymer nanocomposites are a class of hybrid materials composed of organic polymer matrix in which inorganic particles with nano scale dimension are imbedded. We synthesized various polyethylene-layered silicate nanocomposites by melt intercalation. Morphology of these polyethylene-layered silicate nanocomposites were characterized and related to the mechanical properties. Maleic anhydride grafted polyethylene (maleated polyethylene) /silicate nanocomposites were prepared by simple melt intercalation. The exfoliation and intercalation behaviors depended on the hydrophilicity of polyethylene grafted with maleic anhydride and the chain length of organic modifier in the silicate. When the number of methylene groups in alkylamine (organic modifier) was larger than 16 the exfoliated nanocomposite was obtained. And the maleic anhydride grafting level was higher than about 0.1wt% for the exfoliated nanocomposite with the silicate modified with dimethyl dihydrogenated tallow ammonium ion or octadecylammonium ion. The pure LLDPE showed only the intercalation, which did not depend on the initial spacing between silicate layers. Maleated polyethylene/silicate nanocomposite with different aspect ratio of silicate and maleated polyethylene/$SiO_2$ composite were prepared by melt intercalation. Layered silicates (montmorillonite, laponite) were exfoliated in maleated polyethylene (PEMA) matrix while $SiO_2$ was not well dispersed in matrix. The nanocomposite with high aspect ratio silicate (montmorillonite, 20A) showed the faster decrease in terminal slope of storage modulus and the steeper increase in complex viscosity than those with low aspect ratio silicate (laponite) and $SiO_2$. Addition of montmorillonite increased the crystallization and the melting temperature of PEMA but again decreased their temperature above 3 volume% by increased viscosity. The nanocomposite with montmorillonite (PEMA/20A) showed the higher yield strength and secant modulus than the nanocomposit...
Advisors
Chung, In-Jae정인재
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2002
Identifier
174534/325007 / 000975822
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2002.2, [ xiv, 152 p. ]

Keywords

maleic anhydride grafted; polyethylene; nanocomposite; silicate; 실리케이트; 폴리에틸렌; 무수 말레인산; 나노 복합체

URI
http://hdl.handle.net/10203/28882
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=174534&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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