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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Analyzing Raman images of polymer blends by sample-sample two-dimensional correlation spectroscopy
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Analyzing Raman images of polymer blends by sample-sample two-dimensional correlation spectroscopy

机译：通过样品-样品二维相关光谱法分析聚合物共混物的拉曼图像

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摘要

A simple method that facilitates analysis of chemical images is presented. It is based on so-called two-dimensional (2D) correlation spectroscopy and its main purpose is to identify the most specific spectra in an imaging set. The selection is achieved by measuring correlation among the spectra via sample-sample (SS) correlation technique. The idea of SS correlation is exemplified through a simple model and then applied to the mapping Raman spectra of compatibilized (a mixture of two polymers is made homogenous thereby improving its useful plastic properties) and uncompatibilized (mechanically blended) blends of Nylon 12/high-density polyethylene (HDPE), and poly(ethyleneterephthalate)(PET)/HDPE. The Raman spectra of the blends are analyzed with and without pre-treatments (baseline correction by an nth order polynomial, and normalization), and it is found that the results are significantly dependent on the pre-treatment. It is concluded that all the analyzed blends do not exhibit band-shape variation despite the compatibilization, but appear to have unique vibrational signatures, i.e. each blend is found to be completely represented by only one spectrum. The sensitivity of the employed SS correlation method is illustrated through making distinction among heavily overlapped spectra differing minutely in the baseline. [References: 30]
机译：提出了一种有助于化学图像分析的简单方法。它基于所谓的二维（2D）相关光谱法，其主要目的是识别成像集中最具体的光谱。通过使用样本-样本（SS）相关技术测量光谱之间的相关性来实现选择。 SS相关性的想法通过一个简单的模型进行了举例说明，然后应用于相容化（两种聚合物的混合物均一，从而提高了其有用的塑性）和不相容（机械共混）的尼龙12 /高强度共混物的拉曼光谱图。密度聚乙烯（HDPE）和聚对苯二甲酸乙二酯（PET）/ HDPE。在进行和不进行预处理（通过n阶多项式进行基线校正和归一化）的情况下分析掺混物的拉曼光谱，发现结果显着依赖于预处理。结论是，尽管有相容性，所有分析的共混物均未显示出带状变化，但似乎具有独特的振动特征，即发现每种共混物仅由一个光谱完全表示。通过区分基线之间微小差异的重迭光谱，可以说明所采用SS相关方法的灵敏度。 [参考：30]

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