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Quantitative Analysis of Compositional Distribution in Biodegradable Poly(ethylene oxide)/Poly(3‐hydroxybutyrate) Blend Film with Compositional Gradient by FT‐IR Microspectroscopy
Author(s) -
Zhao Li,
He Yong,
Inoue Yoshio
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400531
Subject(s) - absorbance , ethylene oxide , crystallinity , materials science , poly ethylene , oxide , polymer chemistry , analytical chemistry (journal) , chemical engineering , ethylene , polymer , chemistry , composite material , chromatography , organic chemistry , copolymer , catalysis , engineering , metallurgy
Summary: FT‐IR microspectroscopy was used to map the compositional distribution along the cross‐section on the gradient films of fully biodegradable poly(ethylene oxide) (PEO)/poly(3‐hydroxybutyrate) (PHB) blend system. First, a linear fitting line for a calibration, related the absorbance ratio of two peaks to the fraction of PEO in the blend, was established. During linear fitting, a new equation was deduced and the influence of the different crystallinities on the absorption peaks at the wavenumber 962 and 1 342 cm −1 for PEO, 980 and 1 380 cm −1 for PHB, have been taken into account. For the PEO/PHB blend system, it was found that the crystallinity has little effect on the absorbance ratios of A 962 /A 1 380 and A 1 342 /A 1 380 . Based on the results from the linear fitting, which comes from the relation of the absorbance ratios of A 962 /A 1 380 or A 1 342 /A 1 380 and the combination of the weight fraction of PEO ( W PEO /(1 − W PEO )), the compositional distributions on the cross‐section of three kinds of compositional gradient films of the PEO/PHB blend prepared by different technologies have been successfully estimated. Furthermore, the better method for preparing the PEO/PHB blend film with compositional gradient was found based on the result of the quantitative analysis of the compositional distribution.The compositional distribution along the cross‐section of the gradient films based on PEO/PHB binary system for the Type I gradient film.