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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 12
BKCSDE 26(12)
December 20, 2005 

 
Title
Thermal Behavior of Langmuir-Blodgett Film of Poly(tert-butyl methacrylate) by Principal Component Analysis Based Two-Dimensional Correlation Spectroscopy
Author
Young Mee Jung*, Seung Bin Kim
Keywords
Two-dimensional (2D) correlation spectroscopy, PCA2D correlation spectroscopy, Eigenvalue manipulation transformation (EMT), Poly(tert-butyl methacrylate) (PtBMA), Phase transition
Abstract
This paper demonstrates details of thermal behavior of Langmuir-Blodgett (LB) film of poly(tert-butyl methacrylate) (PtBMA) by using the principal component analysis based two-dimensional correlation spectroscopy (PCA2D) through eigenvalue manipulating transformation (EMT). By uniformly lowering the power of a set of eigenvalues associated with the original data, the smaller eigenvalues becomes more prominent and the subtle contribution from minor components is now highlighted much more strongly than the original data. Thus, the subtle difference of thermal behavior of LB film of PtBMA from minor components, which is not readily detectable in the conventional 2D correlation analysis, is much more noticeable than the original data. PCA2D correlation spectra with EMT operation for the temperature-dependent IR spectra of LB film of PtBMA reveal the hidden property of phase transition processes during heating.
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