首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Details of thermal behavior of spin-coated film of biodegradable poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer studied by principal component analysis-based two-dimensional (PCA2D) correlation spectroscopy
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Details of thermal behavior of spin-coated film of biodegradable poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer studied by principal component analysis-based two-dimensional (PCA2D) correlation spectroscopy

机译:基于主成分分析的二维(PCA2D)相关光谱研究可生物降解的聚(3-羟基丁酸酯-co-3-羟基己酸酯)共聚物的旋涂膜的热行为的详细信息

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摘要

Principal component analysis-based two-dimensional (PCA2D) correlation spectroscopy was applied to the temperature-dependent infrared-reflection absorption (IRRAS) spectra of a spin-coated film of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(HB-co-HHx)) (HHx = 7.2 mol%) copolymer. In asynchronous PCA2D correlation spectra, we clearly captured the existence of two components in the crystalline band of the C=O stretching mode, well-ordered primary crystals observed at lower wavenumber and less ordered secondary crystals observed at higher wavenumber, which is not readily detectable in the original 1D spectra. Furthermore, the intensity changes of bands at 1298 and 1280cm(-1) are significantly different in the temperature ranges below and above the transition temperature around 140 degrees C identified by the 2D first derivatives plot. The result further confirms that the sequence of intensity changes with increasing temperature is such that bands for less ordered crystalline components of P(HB-co-HHx) (HHx = 7 2 mol%). are changing first at an earlier (i.e., lower temperature) stage. (C) 2008 Elsevier B.V. All rights reserved.
机译:基于主成分分析的二维(PCA2D)相关光谱应用于聚(3-羟基丁酸酯-co-3-羟基己酸酯)(P( HB-co-HHx))(HHx = 7.2 mol%)共聚物。在异步PCA2D相关光谱中,我们清楚地捕获了C = O拉伸模式的晶体带中存在的两个成分,在较低波数下观察到有序的初级晶体,在较高波数下观察到了有序的次级晶体,这不易检测到。在原始一维光谱中此外,在1298和1280cm(-1)处的能带强度变化在2D一阶导数图所标识的140摄氏度左右的转变温度以下和以上的温度范围内显着不同。该结果进一步证实,强度随温度升高而变化的顺序是:P(HB-co-HHx)的有序晶体组分的带(HHx = 7 2 mol%)。在较早的阶段(即较低的温度)首先进行更改。 (C)2008 Elsevier B.V.保留所有权利。

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