Investigation on the overlapping bands of syndiotactic polystyrene by using 2D-IR spectroscopy

Jiang, Qianhong; Zhao, Ying; Zhang, Chunbo; Yang, Jian; Wang, Dujin

doi:10.1016/j.molstruc.2016.03.103

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…It possesses excellent properties including high melting temperature, superior crystallization rate, enhanced mechanical performance, low dielectric properties, and high chemical resistance. [60][61][62] High impact PS (HIPS) and expanded PS (EPS) are also commonly used in electrical and electronics equipment. HIPS is especially used in applications where PS is unable to meet the standards for impact resistance.…”

Section: Polystyrenementioning

confidence: 99%

Review of natural fiber-reinforced engineering plastic composites, their applications in the transportation sector and processing techniques

Chauhan

Kärki

Varis

2019

Journal of Thermoplastic Composite Materials

154

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Interest in natural fiber-reinforced polymer (NFRP) composites is growing rapidly in the transportation sector, especially as a replacement material for metals and synthetic fiber composites. The heightened interest is directly related to a need to produce lightweight and fuel efficient vehicles. Further, stringent legislation and greater environmental awareness is forcing transportation industries to select materials with a smaller carbon footprint. In such a context, NFRP composite materials are a good choice due to their low cost, low environmental impact, and relatively equivalent properties to metals and other composites. Most prior studies have examined commodity plastics such as polypropylene, polyethylene, and epoxy as the primary polymer matrix in NFRP composites and little work has addressed engineering plastics. Engineering plastics, which includes polycarbonate, polyamides, and polystyrene, are high performance thermoplastics with superior properties but relatively higher cost than commodity plastics. It has been claimed that even after recycling, engineering plastics properties are superior to those of commodity plastics, and thus, utilization of recycled engineering plastic in NFRP composites can help reduce waste and lower composite material costs. The aim of this review article is to explore the current status of engineering plastics reinforced with natural fibers such as flax, hemp, jute, and sisal and to examine their use in automotive, aerospace, and maritime applications. Properties and processing techniques of engineering plastics reinforced with natural fibers are also studied.

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Section: Polystyrenementioning

confidence: 99%

Review of natural fiber-reinforced engineering plastic composites, their applications in the transportation sector and processing techniques

Chauhan

Kärki

Varis

2019

Journal of Thermoplastic Composite Materials

154

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“…[1][2][3][4][5] The past three decades have witnessed great progress in 2D-COS, and a large number of relevant papers have accumulated in the literature. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] We developed an orthogonal sample design scheme and related techniques to investigate intermolecular interaction between two solutes dissolved in the same solutions. [22][23][24][25][26] Via these approaches, an intermolecular interaction is reliably reflected as cross-peaks in 2D spectra.…”

Section: Introductionmentioning

confidence: 99%

Intensity Enhancement of a Two-Dimensional Asynchronous Spectrum Without Noise Level Fluctuation Escalation Using a One-Dimensional Spectra Sequence Change

Zhou

et al. 2020

Appl Spectrosc

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Previously, we demonstrated that the intensities of cross peaks in a two-dimensional asynchronous spectrum could be enhanced via a change of the sequence of the corresponding 1D spectra. This unusual approach becomes useful when the determination of the sequential order of physicochemical events is not essential. However, we have not known whether the level of noise in the 2D asynchronous spectrum is also escalated as the sequence of 1D spectra is changed. Herein, we firstly investigate the noise behavior in a two-dimensional asynchronous spectrum upon changing the sequence of the corresponding 1D spectra on a model system. In the model system, bilinear data from a chromatographic-spectroscopic experiment on a mixture containing two components are analyzed via 2D asynchronous spectrum. The computer simulation results confirm that the cross peaks intensities in the resultant 2D asynchronous spectrum are indeed enhanced by more than100 times as the sequence of 1D spectra is changed, whereasthe fluctuation level of noise, reflected by the standard deviation of the value of a 2D asynchronous spectrum at a given point, is almost invariant. Further analysis on the model systems demonstrates that the special mathematical property of the Hilbert-Noda matrix (the modules of all the column vectors of the Hilbert-Noda matrix is near a constant) accounts for the moderate variation of the noise level during the changes of the sequence of 1D spectra. Secondly, a realistic example from a thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) experiment with added artificial noise in seven 1D spectra was studied. As we alter the sequence of the seven FTIR spectra, the variation of the intensities of cross peaks covers four orders of magnitudes in the 2D asynchronous spectra. In contrast, the fluctuation of noise in 2D asynchronous spectra is within two times. The above results clearly demonstrate that a change in the sequence of 1D spectra is an effective way to improve the signal-to-noise level of the 2D asynchronous spectra.

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“…Two‐dimensional (2D) correlation spectroscopy is a versatile powerful technique that can be used to interpret spectral data obtained under external perturbations, which can provide new molecular‐level insights . Based on advantages such as the establishment of unambiguous assignments and determination of the sequence of change of the spectral peaks, 2D correlation analysis has already been successfully applied to several spectroscopic techniques including infrared absorption, vibrational circular dichroism, and Raman scattering in various polymer and biopolymer studies …”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34] Based on advantages such as the establishment of unambiguous assignments and determination of the sequence of change of the spectral peaks, 2D correlation analysis has already been successfully applied to several spectroscopic techniques including infrared absorption, vibrational circular dichroism, and Raman scattering in various polymer and biopolymer studies. [35][36][37][38] Herein, we have investigated the helix-sense inversion of PPLA in the solid state obtained from a chloroform solution by studying the temperature-dependent Raman scattering and 2D correlation analysis.…”

Section: Introductionmentioning

confidence: 99%

Insights into the helix‐sense inversion of poly(β‐phenethyl‐L‐aspartate) by two‐dimensional Raman correlation spectroscopy

Suzuki

Furuya

2018

Journal of Peptide Science

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In this study, the transition process of the helix-sense inversion of poly(β-phenethyl-L-aspartate) was investigated by Raman scattering and 2-dimensional correlation spectroscopy. Temperature-dependent Raman spectra were obtained during the helix-sense inversion. The results of 2-dimensional correlation analysis in the spectral regions of 1600-1800 and 3200-3400 cm showed that the intensity changes of the side-chain ester C═O stretching bands occurred prior to those of amide A and amide I bands in the unwinding process of αR-helix on heating. The sequential order of the intensity changes for amide A, amide I, and the side-chain ester C═O stretching bands during the inversion process was determined. It was found that the conformation change of the side chain occurred prior to that of the main chain for the αR-helix on heating. Thus, we concluded that the transformation of the backbone chain from right-handed to left-handed is triggered by the conformational change of the side chains.

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Investigation on the overlapping bands of syndiotactic polystyrene by using 2D-IR spectroscopy

Cited by 9 publications

References 43 publications

Review of natural fiber-reinforced engineering plastic composites, their applications in the transportation sector and processing techniques

Review of natural fiber-reinforced engineering plastic composites, their applications in the transportation sector and processing techniques

Intensity Enhancement of a Two-Dimensional Asynchronous Spectrum Without Noise Level Fluctuation Escalation Using a One-Dimensional Spectra Sequence Change

Insights into the helix‐sense inversion of poly(β‐phenethyl‐L‐aspartate) by two‐dimensional Raman correlation spectroscopy

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