Analytical Sciences

A Study on Blend Ratio-dependent Far-IR and Low-frequency Raman Spectra and WAXD Patterns of Poly(3-hydroxybutyrate)/poly(4-vinylphenol) Using Homospectral and Heterospectral Two-dimensional Correlation Spectroscopy

Dian MARLINA,*1,*2 Yeonju PARK,*3 Hiromichi HOSHINA,*4 Yukihiro OZAKI,*5,*6 Young Mee JUNG,*3 and Harumi SATO*1,*6

*1 Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe 657-8501, Japan
*2 Faculty of Pharmacy, Universitas Setia Budi, Surakarta, Central Java 57127, Indonesia
*3 Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
*4 Center for Advance Photonic, RIKEN, Sendai, Miyagi 980-0845, Japan
*5 School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337, Hyogo, Japan
*6 Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501, Japan

An intensive analysis of far-infrared (far-IR), low-frequency Raman, and wide angle X-ray diffraction (WAXD) data has been performed by two-dimensional correlation spectroscopy (2D-COS) as a function of the blend ratio of poly(3-hydroxybutyrate)/poly(4-vinylphenol) (PHB/PVPh). Homospectral 2D-COS revealed that a weak band at 128 cm⁻¹ in the far-IR spectra appeared more clearly in the 2D correlation spectra. Heterospectral 2D-COS (far-IR/low-frequency Raman and far-IR/WAXD) provided very important results that were hardly detected in the conventional 2D-COS. A far-IR peak at 130 cm⁻¹ in the heterospectral 2D-COS had negative correlations with the peaks in the low-frequency Raman spectra at 81, 100, and 110 cm⁻¹ and WAXD profile 8.78 and 11.01°. These results indicated that those peaks have different origins; the 130 cm⁻¹ peak comes from the intermolecular C=O···H–O hydrogen bond between PHB and PVPh, while those for low-frequency Raman and WAXD peaks are the features of PHB crystalline structure.

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