DC Field | Value | Language |
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dc.contributor.author | Hyeon-Lee, J | ko |
dc.contributor.author | Lyu, YY | ko |
dc.contributor.author | Lee, MS | ko |
dc.contributor.author | Hahn, JH | ko |
dc.contributor.author | Rhee, JH | ko |
dc.contributor.author | Mah, SK | ko |
dc.contributor.author | Yim, JH | ko |
dc.contributor.author | Kim, Sang Youl | ko |
dc.date.accessioned | 2013-03-04T17:51:48Z | - |
dc.date.available | 2013-03-04T17:51:48Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2004-02 | - |
dc.identifier.citation | MACROMOLECULAR MATERIALS AND ENGINEERING, v.289, no.2, pp.164 - 173 | - |
dc.identifier.issn | 1438-7492 | - |
dc.identifier.uri | http://hdl.handle.net/10203/83519 | - |
dc.description.abstract | Dielectric cyclosiloxane bearing polysilsesquioxanes (CS-PSSQs) were prepared by acid catalyzed polymerization using 2,4,6,8-tetramethyl-2,4,6,8-tetra(trimethoxysilylethyl)cyclotetrasiloxane. The molecular weight, and content of the functional end-groups of the CS-PSSQs were found to be dependent on the process parameters, such as the molar ratio of water and catalyst to the -OCH3 group of the silane monomer, the amount of solvent, and the poly(e-caprolactone) (PCL) content, etc. Based on these CS-PSSQ prepolymers, nanoporous organic/inorganic hybrid thin films were fabricated by spin-coating mixtures of these prepolymers with star-shaped PCL on the silicon substrate, and subsequently heating them at 150 and 250 degreesC for 1 minute each and then at 420degreesC for 1 hour. A dielectric constant as low as 2.28 was achieved for the nanoporous PCL/CS-PSSQ (3:7 v/v) film, along with low moisture absorption in ambient and water conditions, primarily due to the presence of hydrophobic moieties such as ethylene and methyl groups of the polymer and nano-sized hydrophobic pores inside the matrix, resulting in the film having stable dielectric properties. Moreover, the PCL/CS-PSSQ (3:7 v/v) nanohybrid film revealed a nanoporous structure containing ca. 1.52 nm of average-sized mesopores, as measured by the N-2 adsorption method. The CS-PSSQ-only film showed high mechanical strengths having an elastic modulus and hardness of 6.64 and 0.88 GPa, respectively, for the 7 500 Angstrom thick film and 2.41 and 0.38 GPa, respectively, for the PCL/CS-PSSQ (3:7 v/v) film. In addition, the crack velocity of the CS-PSSQ-only film was found to be ca. 10(-11) m . s(-1) in ambient conditions and an aqueous environment, probably due to the enhanced hydrophobicity and mechanical toughness of the incorporated methyl group, siloxane unit and ethylene moieties in the polymer matrix. | - |
dc.language | English | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.subject | CONSTANT MATERIALS | - |
dc.subject | POLY(METHYLSILSESQUIOXANE)S | - |
dc.subject | STAR | - |
dc.title | Nanoporous low dielectric cyclosiloxane bearing polysilsesquioxane thin films templated by poly(epsilon-caprolactone) | - |
dc.type | Article | - |
dc.identifier.wosid | 000220331600004 | - |
dc.identifier.scopusid | 2-s2.0-4544341541 | - |
dc.type.rims | ART | - |
dc.citation.volume | 289 | - |
dc.citation.issue | 2 | - |
dc.citation.beginningpage | 164 | - |
dc.citation.endingpage | 173 | - |
dc.citation.publicationname | MACROMOLECULAR MATERIALS AND ENGINEERING | - |
dc.identifier.doi | 10.1002/mame.200300182 | - |
dc.contributor.localauthor | Kim, Sang Youl | - |
dc.contributor.nonIdAuthor | Hyeon-Lee, J | - |
dc.contributor.nonIdAuthor | Lyu, YY | - |
dc.contributor.nonIdAuthor | Lee, MS | - |
dc.contributor.nonIdAuthor | Hahn, JH | - |
dc.contributor.nonIdAuthor | Rhee, JH | - |
dc.contributor.nonIdAuthor | Mah, SK | - |
dc.contributor.nonIdAuthor | Yim, JH | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | cyclosiloxane | - |
dc.subject.keywordAuthor | dielectric properties | - |
dc.subject.keywordAuthor | mechanical properties | - |
dc.subject.keywordAuthor | poly(epsilon-caprolactone) | - |
dc.subject.keywordAuthor | polysilsesquioxanes | - |
dc.subject.keywordPlus | CONSTANT MATERIALS | - |
dc.subject.keywordPlus | POLY(METHYLSILSESQUIOXANE)S | - |
dc.subject.keywordPlus | STAR | - |
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