Raman Spectra Used to Understand the Origins of Banding in Spherulites

IF 0.8 4区 化学 Q4 SPECTROSCOPY Spectroscopy Pub Date : 2023-12-01 DOI:10.56530/spectroscopy.wu2080k9
Fran Adar
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Abstract

The formation of spherulites in polymers is a well-known phenomenon; when the polymer is crystallized by cooling from the melt, crystal lamellae grow out from a nucleation site in a spherical pattern. If the material is annealed on a planar surface, and viewed between crossed polarizers in a microscope, a Maltese cross with a banding pattern is observed. Where the crystals grow in a direction not parallel to the polarizers, the sample lights up. Often banding of the lit regions is observed, and is believed to be due to rotations of the crystal lamellae around the growth direction. Because it is well known that polarized Raman spectra respond to crystal orientation, we thought it would be interesting to try to document the relationship between the banding behavior and Raman polarization/orientation behavior. In this column I will show results of such an investigation of spherulites of poly(hydroxybutyate-co-hydroxyhexanoate) (PHBHx) with varying composition.
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利用拉曼光谱了解球粒云母带状结构的起源
聚合物中球粒的形成是一种众所周知的现象;当聚合物从熔体中冷却结晶时,晶体片从成核位置以球形图案生长出来。如果材料在平面上退火,并在显微镜中交叉偏振光片之间观察,可以观察到具有带状图案的马耳他十字。当晶体生长的方向与偏振光片不平行时,样品就会发光。经常观察到发光区域的带状,并且被认为是由于晶体片围绕生长方向的旋转。由于众所周知,极化拉曼光谱响应晶体取向,我们认为尝试记录带行为与拉曼极化/取向行为之间的关系将是有趣的。在本专栏中,我将展示具有不同组成的聚(羟基丁酸-共羟基己酸酯)(PHBHx)球粒的研究结果。
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来源期刊
Spectroscopy
Spectroscopy 物理-光谱学
CiteScore
1.10
自引率
0.00%
发文量
0
审稿时长
3 months
期刊介绍: Spectroscopy welcomes manuscripts that describe techniques and applications of all forms of spectroscopy and that are of immediate interest to users in industry, academia, and government.
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