A General Approach for Estimating Lamella-Thickness Distribution in Polymers with Low-Frequency Raman Spectroscopy: Application to Lamella Formation in Crystallizing Polyethylene

2018 ◽  
Vol 24 (37) ◽  
pp. 9333-9339 ◽  
Author(s):  
Ashok Zachariah Samuel ◽  
Hiro-o Hamaguchi
Keyword(s):  
Raman Spectroscopy ◽  
Thickness Distribution ◽  
Low Frequency ◽  
Lamella Thickness

scholarly journals Identification of LDPE Grades Focusing on Specific CH2 Raman Vibration Modes

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Richard Jumeau ◽  
Patrice Bourson ◽  
Michel Ferriol ◽  
François Lahure ◽  
Marc Ponçot ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Raman Spectroscopy ◽  
Vibrational Spectroscopy ◽  
Phenomenological Model ◽  
Low Density ◽  
Vibration Modes ◽  
Scanning Calorimetry ◽  
Lamella Thickness ◽  
Poly Ethylene

The possibilities of applications of vibrational spectroscopy techniques (Raman spectroscopy) in the analysis and characterization of polymers are more and more used and accurate. In this paper, our purpose is to characterize Low Density Poly(Ethylene) (LDPE) grades by Raman spectroscopy and in particular with CH2 Raman vibration modes. With temperature measurements, we determine different amorphous and crystalline Raman assignments. From these results and on the basis of the evolution of CH2 bending Raman vibration modes, we develop a phenomenological model in correlation with Differential Scanning Calorimetry and in particular with crystalline lamella thickness determination.

A report on the longitudinal accordian mode in polyalkenamers using low frequency Raman spectroscopy

Polymer ◽  
1979 ◽  
Vol 20 (6) ◽  
pp. 780-781 ◽  
Author(s):  
G.V. Fraser ◽  
A. Keller ◽  
J.M. Pastor ◽  
J.A. De Saha ◽  
E. Martuscelli
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency

Exploring interlayer interaction of SnSe2 by low-frequency Raman spectroscopy

2019 ◽  
Vol 105 ◽  
pp. 7-12 ◽  
Author(s):  
Xiang Zhou ◽  
Junyi Li ◽  
Yuchen Leng ◽  
Xin Cong ◽  
Dameng Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency ◽  
Interlayer Interaction

Discrimination and quantification of sulfathiazole polytypes using low-frequency Raman spectroscopy

CrystEngComm ◽  
2018 ◽  
Vol 20 (14) ◽  
pp. 1928-1934 ◽  
Author(s):  
Kentaro Iwata ◽  
Masatoshi Karashima ◽  
Yukihiro Ikeda ◽  
Motoki Inoue ◽  
Toshiro Fukami
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency

Low-frequency Raman spectroscopy has advantage to discriminate and quantify polymorphs where common 2D superstructures are piled up with different mode.

scholarly journals Polarization Dependence of Low-Frequency Vibrations from Multiple Faces in an Organic Single Crystal

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 425 ◽  
Author(s):  
Nemtsov ◽  
Aviv ◽  
Mastai ◽  
Tischler
Keyword(s):  
Raman Spectroscopy ◽  
Intermolecular Interactions ◽  
Signal Intensity ◽  
Structural Information ◽  
Low Frequency ◽  
Incident Beam ◽  
Optical Filters ◽  
Polarization Dependence ◽  
Raman Signal ◽  
Shear Modes

Recent developments in optical filters have enabled the facile use of Raman spectroscopy for detection of low frequency (LF) vibrational modes. LF-Raman spectroscopy offers fast and sensitive characterization of LF vibrations, and enables the measurement of single microcrystals and detection of defects. It is useful for probing intermolecular interactions in crystals, which are lower in energy, such as hydrogen bonds, shear modes, and breathing modes. Crystal excitation from multiple faces allows learning the orientation of intermolecular interactions, as polarization dependence varies with the polarizability of the interactions along the planes. Elucidating the orientations of the intermolecular interactions in organic crystals is essential for guiding the reactions or adsorption to a specific crystal face. In this study, we investigated the dependence of the LF-Raman signal intensity on the orientation of an organic single microcrystal of L-alanine. Three incident beam directions provided the orientations of the intermolecular interactions by analyzing the corresponding LF-Raman spectra. The signal intensity correlated well with the proximity between the incident beam’s direction and the orientations of the intermolecular interactions. Excellent compatibility was found between the spectra and simulated orientations based on structural information.

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