This can be explained by the effective sampling depths of Raman spectroscopy, which range from 20 to more than 50 µm (depending on the numerical aperture of the lens and the laser wavelength ...

Apr 17, 2024 · This study addresses this gap by using theoretical calculations to generate ab initio spectra for polystyrene, a reference material. The aim is to explain the origins of the spectral peaks and their consistency across various compositions and structures using linear ordered polymeric and finite amorphous models.

In this work, we attempt to fill this gap by employing theoretical calculations to generate ab initio spectra on the reference material polystyrene. The goal is to explain the origin of the peaks and their robustness to map the Raman response on controlled composition and structure, using linear ordered polymeric and finite amorphous models.

Raman spectra of polystyrene include several narrow peaks eаch corresponding to a particular rotational or vibrational resonance.

The long-term stability of polystyrene discs stored at 15 to 25°C in darkness was assessed by estimating the Raman shifts of all peaks for two points on each disc at 1, 2, 4, 6, 8, and 9.5 months.

Raman spectra for helical infinite polystyrene chain calculated with PBE and PBE-D3 functional and two different basis sets: Basis 5 in dotted lines and Basis 7 in solid line.

Jan 17, 2025 · We detected the most prominent peak of the polystyrene particles at 1001 cm-1, corresponding to the ring breathing mode. We established the minimum and maximum limit of detection (LODmin and LODmax) using a partial least squares (PLS) model.

Download scientific diagram | Raman spectrum of Polystyrene from publication: A role of DFT and spectroscopy to study phase transition: Bent-Core Liquid Crystals | In this review article we...

May 6, 1996 · A detailed analysis of the Raman spectrum of syndiotactic polystyrene, sPS, in the region 600−850 cm -1 has been undertaken. As sPS exhibits considerable polymorphism, spectra of various preparations including melt-crystallized sPS (α/β form), solvent-crystallized sPS (γ/δ forms), and quenched glassy material were studied.

Nov 1, 2006 · The Raman peaks of all PS samples show proportional increase in frequency with pressure. The peaks at 222 and 55 cm −1 of partly crystalline iPS shift to 215 and 65 cm −1 after heat treatment, respectively.