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DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 7850 | - |
dc.citation.number | 25 | - |
dc.citation.startPage | 7842 | - |
dc.citation.title | LANGMUIR | - |
dc.citation.volume | 17 | - |
dc.contributor.author | Shin, Tae Joo | - |
dc.contributor.author | Lee, Byeongdu | - |
dc.contributor.author | Youn, Hwa Shik | - |
dc.contributor.author | Lee, Ki-Bong | - |
dc.contributor.author | Ree, Moonhor | - |
dc.date.accessioned | 2023-12-22T11:41:00Z | - |
dc.date.available | 2023-12-22T11:41:00Z | - |
dc.date.created | 2015-09-04 | - |
dc.date.issued | 2001-12 | - |
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% | - |
dc.identifier.bibliographicCitation | LANGMUIR, v.17, no.25, pp.7842 - 7850 | - |
dc.identifier.doi | 10.1021/la0108656 | - |
dc.identifier.issn | 0743-7463 | - |
dc.identifier.scopusid | 2-s2.0-0035846789 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/16643 | - |
dc.identifier.url | http://pubs.acs.org/doi/abs/10.1021/la0108656 | - |
dc.identifier.wosid | 000172590800021 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
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) | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
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