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首页> 外文期刊>Journal of Molecular Structure >Two-dimensional correlation analysis of highly spatially resolved simultaneous IR and Raman spectral imaging of bioplastics composite using optical photothermal Infrared and Raman spectroscopy
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Two-dimensional correlation analysis of highly spatially resolved simultaneous IR and Raman spectral imaging of bioplastics composite using optical photothermal Infrared and Raman spectroscopy

机译：使用光学热红外红外线和拉曼光谱法对生物塑料复合材料高度空间分辨的同时IR和拉曼光谱成像的二维相关分析

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摘要

Optical photothermal infrared (O-PTIR) and Raman spectroscopy and imaging was used to explore the spatial distributions of molecular constituents of a laminate sample consisting of the bioplastics, poly-hydroxyalkanoate (PHA) and polylactic acid (PLA), near the interfacial boundary. Highly spatially resolved simultaneous IR and Raman spectra were sequentially collected at 100 nm increments along a line traversing the interface. The set of spectra were subjected to 2D-COS analysis to extract the detailed nature of the spatial distribution of the laminate constituents. It was revealed that the laminate is not a simple binary system of two non-interacting polymers, but consists of different constituents with more complex spatial distributions. Some portion of PLA seems to penetrate into the PHA layer. The crystallinity of PHA near the interface is reduced compared to the rest of the PHA layer. The result suggests the existence of some partial molecular mixing even for these seemingly immiscible polymer pairs. The mixing probably occurs at the segmental level confined to only several hundred nanometers of space at the interface. Such partial mixing may explain the high compatibility between the two bioplastics. (C) 2020 Elsevier B.V. All rights reserved.
机译：光学热红外（O-PTIR）和拉曼光谱和成像用于探讨由界面边界附近的生物塑料，聚羟基烷烷（PHA）和聚乳酸（PLA）组成的层压样品的分子成分的空间分布。沿着穿过接口的线以100nm增量顺序地收集高度空间分辨的同时IR和拉曼光谱。对其的光谱进行2D-COS分析，以提取层压成分的空间分布的详细性质。据透露，层压材料不是两个非相互作用聚合物的简单二进制系统，而是由具有更复杂的空间分布的不同成分组成。 PLA的一些部分似乎渗透到P​​HA层中。与其余的PHA层相比，界面附近的PHA的结晶度降低。结果表明即使对于这些看似不混溶的聚合物对，也存在一些部分分子混合。混合可能发生在界面上仅限于仅几百纳米的空间。这种局部混合可以解释两种生物塑料之间的高相容性。 （c）2020 Elsevier B.v.保留所有权利。

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