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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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  • Synchrotron Radiation Application Researches

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Time-resolved synchrotron X-ray diffraction and infrared spectroscopic studies of imidization and structural evolution in a microscaled film of PMDA-3,4 '-ODA poly(amic acid)

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dc.contributor.author Shin, Tae Joo ko
dc.contributor.author Lee, Byeongdu ko
dc.contributor.author Youn, Hwa Shik ko
dc.contributor.author Lee, Ki-Bong ko
dc.contributor.author Ree, Moonhor ko
dc.date.available 2015-09-04T04:53:37Z -
dc.date.created 2015-09-04 ko
dc.date.issued 2001-12 ko
dc.identifier.citation LANGMUIR, v.17, no.25, pp.7842 - 7850 ko
dc.identifier.issn 0743-7463 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/16643 -
dc.description.abstract The imidization behavior and structural evolution in a microscaled film of poly(3,4'-oxydiphenylene pyromellitamic acid) precursor are studied by time-resolved synchrotron wide-angle X-ray diffraction and infrared spectroscopy to investigate the relationship between thermal imidization and structural evolution in the precursor. The precursor film displays only short-range order, but its polyimide film shows a crystalline structure based on an orthorhombic crystal lattice unit. When the precursor is heated at 2.0 degreesC/min, it undergoes imidization over the temperature range 124-310 degreesC through a two-step process: (i) decomplexation of the amide linkage from residual solvent molecules and other intra- and intermolecular amic acid groups and (ii) imide-ring closure. The maximum rate of imidization occurs at 148.4 degreesC. Anhydride rings are found to form transiently over the range 93-310 degreesC, which are attributed to the nature of the equilibrium between the precursor and its constituent anhydride- and amino-terminated species. The imidization reaction begins prior to the commencement of structural evolution. The structural evolution takes place over 132-380 degreesC as a three-step process: initiation, primary growth, and secondary growth. In particular, the initiation step requires at least 3.2% imidization. The structural evolution is further influenced by the short-range ordered structure formed in the precursor film in the process of film formation. However, the overall crystallinity in the fully imidized film is limited to only 21.4% ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Time-resolved synchrotron X-ray diffraction and infrared spectroscopic studies of imidization and structural evolution in a microscaled film of PMDA-3,4 '-ODA poly(amic acid) ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-0035846789 ko
dc.identifier.wosid 000172590800021 ko
dc.type.rims ART ko
dc.description.wostc 41 *
dc.description.scopustc 45 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1021/la0108656 ko
dc.identifier.url http://pubs.acs.org/doi/abs/10.1021/la0108656 ko
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