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DC Field | Value | Language |
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dc.citation.endPage | 5528 | - |
dc.citation.number | 14 | - |
dc.citation.startPage | 5523 | - |
dc.citation.title | LANGMUIR | - |
dc.citation.volume | 18 | - |
dc.contributor.author | Shin, Hyeon Suk | - |
dc.contributor.author | Jung, YM | - |
dc.contributor.author | Lee, J | - |
dc.contributor.author | Chang, T | - |
dc.contributor.author | Ozaki, Y | - |
dc.contributor.author | Kim, SB | - |
dc.date.accessioned | 2023-12-22T11:37:37Z | - |
dc.date.available | 2023-12-22T11:37:37Z | - |
dc.date.created | 2014-09-04 | - |
dc.date.issued | 2002-07 | - |
dc.description.abstract | The structures of Langmuir-Blodgett (LB) and spin-coated films of poly(tert-butyl methacrylate) (PtBMA) were investigated by means of external reflection Fourier transform infrared (FTIR) spectroscopy and two-dimensional correlation analysis. In addition, the structural relaxation of the films during heating was studied. At room temperature, the intensity ratio of the band at 1728 cm(-1) (assigned to the C=O stretching mode) and the band at 1147 cm(-1) (assigned to the C-O stretching modes of the tert-butoxy group) in the external reflection infrared spectrum of the LB film was greater than that in the spectrum of the spin-coated film. However, the values of this intensity ratio for the LB and spin-coated films converged with increasing temperature. The results suggest that the structural difference between the two types of film is primarily due to strain in the tert-butoxy group in the LB film. The same trend was observed in the intensity ratio of the bands at 1255 and 1274 cm(-1) assigned to the C-C-O stretching mode. Two-dimensional (2D) correlation analysis was applied to the external reflection FTIR spectral data of the LB and spin-coated films of PtBMA to analyze the relaxation of the films during heating. In the synchronous spectra of both film types, the strongest autopeak corresponded to the C-O stretching mode, appearing at 1151 and 1168 cm(-1) for the LB and spin-coated films, respectively. This suggests that the conformation of the tert-butoxy group changes significantly with increasing temperature. The intensity of the autopeak at 1151 cm(-1) in the synchronous 2D spectrum of the LB film is much higher than the intensities of the other autopeaks, indicating that the C-O group in the LB film undergoes mainly local reorientation, which in turn indicates that the tert-butoxy group is greatly strained in the room-temperature LB film. On the other hand, the tert-butoxy group of the spin-coated film is less strained than that of the LB film because the intensity of the autopeak at 1168 cm(-1) in the synchronous 2D spectrum of the spin-coated film is slightly higher than the intensities of the other autopeaks. Furthermore, the analysis of the signs of asynchronous cross-peaks revealed that the following sequence of spectral changes is induced as the temperature increases; 1131 (bending of C-bb-C-O and C-bb-C=O) --> [1393 (CH3 bending of alpha-methyl), 1151 (C-O stretching)] cm(-1) and 1133 --> 1393 --> 1168 (C-O stretching) cm(-1) for the LB and spin-coated films, respectively. This suggests that in both film types the first event is associated with reorientation in both the chain backbone and the side chain. During heating, the alpha-methyl group relaxes along with the C-O bond in the LB film but prior to the C-O bond in the spin-coated film. | - |
dc.identifier.bibliographicCitation | LANGMUIR, v.18, no.14, pp.5523 - 5528 | - |
dc.identifier.doi | 10.1021/la020135d | - |
dc.identifier.issn | 0743-7463 | - |
dc.identifier.scopusid | 2-s2.0-0037047192 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/5913 | - |
dc.identifier.url | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037047192 | - |
dc.identifier.wosid | 000176627000030 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Structural comparison of Langmuir-Blodgett and spin-coated films of poly(tert-butyl methacrylate) by external reflection FTIR spectroscopy and two-dimensional correlation analysis | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
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