Characterization of beta-transition of poly(tert-butyl methacrylate) thin films by two-dimensional infrared correlation spectral analysis
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- Characterization of beta-transition of poly(tert-butyl methacrylate) thin films by two-dimensional infrared correlation spectral analysis
- Shin, Hyeon Suk; Jung, Young Mee; Chang, Tai Hyun; Ozaki, Yukihiro; Kim, Seung Bin
- 2D correlation spectroscopy; Glass transition temperature; LB film; Poly(tert-butyl methacrylate) (PtBMA); Spin-coated film
- Issue Date
- ELSEVIER SCIENCE BV
- VIBRATIONAL SPECTROSCOPY, v.29, no.1-2, pp.73 - 77
- Two-dimensional (2D) correlation analysis has been applied to temperature-dependent FTIR spectra of Langmuir-Blodgett (LB) and spin-coated films of poly(tert-butyl methacrylate) (PtBMA). Synchronous 2D correlation spectra were generated for two temperature regions, i.e. those below and above the glass transition temperature (Tg), to investigate the re-orientation of polymer chain. The autocorrelation analysis revealed that the re-orientation of the bbC-C-O and bbC-C=O bonds connected to chain backbone (bb) and that of the C-O bond of the tert-butoxy group are significant below and above the glass transition temperature, respectively. It is implied strongly from these observations that the simultaneous re-orientation of the chain backbone and the side chain is responsible for the β-transition of PtBMA.
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