DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Sun Dal | ko |
dc.contributor.author | Kim, Sang Youl | ko |
dc.contributor.author | Chung, Im Sik | ko |
dc.date.accessioned | 2015-07-21T02:24:15Z | - |
dc.date.available | 2015-07-21T02:24:15Z | - |
dc.date.created | 2013-11-06 | - |
dc.date.created | 2013-11-06 | - |
dc.date.issued | 2013-10 | - |
dc.identifier.citation | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.51, no.20, pp.4413 - 4422 | - |
dc.identifier.issn | 0887-624X | - |
dc.identifier.uri | http://hdl.handle.net/10203/199644 | - |
dc.description.abstract | A new unsymmetrical diamine monomer containing two trifluoromethyl (CF3) groups is prepared from 2-bromo-5-nitro-1,3-bis(trifluoromethyl)benzene. The monomer is polymerized with typical dianhydrides, in this case PMDA, BPDA, BTDA, ODPA, and 6-FDA, using a one-pot synthetic method to obtain corresponding polyimides. All of the prepared polyimides are readily soluble in many organic solvents and can be solution-cast into transparent, flexible, and tough films. These films have a UV-vis absorption cut-off wavelength at 340-375 nm and light transparencies of 87-91% at a wavelength of 550 nm. Incorporation of two CF3 groups unsymmetrically into rigid polyimides improves their solubility and transparencies without decreasing their physical properties. The polymers exhibit high thermal stability with 5% weight loss at temperatures ranging from 534 to 593 degrees C in nitrogen and from 519 to 568 degrees C in air, and high glass transition temperatures (T-g) above > 300 degrees C depending on their molecular structures. They also have a coefficient of thermal expansion (CTE) value of 46-69 ppm/degrees C. In addition, they show low refractive indices in the range of 1.535-1.602 at a wavelength of 633 nm due to the unsymmetrical incorporation effect of the two CF3 groups. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4413-4422 | - |
dc.language | English | - |
dc.publisher | WILEY-BLACKWELL | - |
dc.subject | AROMATIC POLYIMIDES | - |
dc.subject | FLUORINATED POLYIMIDES | - |
dc.subject | POLY(ETHER IMIDE)S | - |
dc.subject | PENDANT GROUPS | - |
dc.subject | DIANHYDRIDE | - |
dc.subject | COPOLYIMIDES | - |
dc.subject | ETHER | - |
dc.title | Soluble and Transparent Polyimides from Unsymmetrical Diamine Containing Two Trifluoromethyl Groups | - |
dc.type | Article | - |
dc.identifier.wosid | 000324389400018 | - |
dc.identifier.scopusid | 2-s2.0-84884283159 | - |
dc.type.rims | ART | - |
dc.citation.volume | 51 | - |
dc.citation.issue | 20 | - |
dc.citation.beginningpage | 4413 | - |
dc.citation.endingpage | 4422 | - |
dc.citation.publicationname | JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | - |
dc.identifier.doi | 10.1002/pola.26855 | - |
dc.contributor.localauthor | Kim, Sang Youl | - |
dc.contributor.nonIdAuthor | Kim, Sun Dal | - |
dc.contributor.nonIdAuthor | Chung, Im Sik | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | films | - |
dc.subject.keywordAuthor | high performance polymers | - |
dc.subject.keywordAuthor | polyimides | - |
dc.subject.keywordAuthor | trifluoromethyl groups | - |
dc.subject.keywordPlus | AROMATIC POLYIMIDES | - |
dc.subject.keywordPlus | FLUORINATED POLYIMIDES | - |
dc.subject.keywordPlus | POLY(ETHER IMIDE)S | - |
dc.subject.keywordPlus | PENDANT GROUPS | - |
dc.subject.keywordPlus | DIANHYDRIDE | - |
dc.subject.keywordPlus | COPOLYIMIDES | - |
dc.subject.keywordPlus | ETHER | - |
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