Regularity modes in Raman spectra of polyolefins: Part II. Polyethylene and ethylene copolymers

Sagitova, E.A.; Donfack, Patrice; Nikolaeva, G. Yu.; Prokhorov, K. A.; Zavgorodnev, Yury V.; Пашинин, П. П.; Ushakova, T. M.; Новокшонова, Л. А.; Starchak, E. E.; Guseva, M. A.; Gerasin, V. A.; Kammer, Bernd von der; Materny, Arnulf

doi:10.1016/j.vibspec.2016.03.013

Cited by 29 publications

(34 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in the literature [47, 48, 50, 51], three Raman bands at 1,060, 1,080, and 1,130 cm −1 describing the C-C skeleton stretching vibrations of long-chain hydrocarbons are sensitive to the trans - gauche conformation order in lipids. The bands at 1,060 and 1,130 cm −1 appear in the Raman spectrum if the presence of trans-sequences is more than 6 and the length of a long alkyl chains contain more than 18 CH 2 groups, respectively [52, 53]. With a smaller number of CH 2 groups in the trans-sequence, the position of the Raman band at 1,130 cm −1 is shifted toward larger wavenumbers [53].…”

Section: Resultsmentioning

confidence: 99%

“…The bands at 1,060 and 1,130 cm −1 appear in the Raman spectrum if the presence of trans-sequences is more than 6 and the length of a long alkyl chains contain more than 18 CH 2 groups, respectively [52, 53]. With a smaller number of CH 2 groups in the trans-sequence, the position of the Raman band at 1,130 cm −1 is shifted toward larger wavenumbers [53]. Thus, Raman bands at 1,060 and 1,130 cm −1 characterize the lipid chains containing trans conformers (more ordered state), while the Raman band at 1,080 cm −1 characterizes the lipid chains containing only gauche conformers (less ordered state).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Current Views on Noninvasive in vivo Determination of Physiological Parameters of the Stratum Corneum Using Confocal Raman Microspectroscopy

Darvin

Schleusener

Lademann

et al. 2022

Skin Pharmacol Physiol

View full text Add to dashboard Cite

Confocal Raman microspectroscopy is widely used in dermatology and cosmetology for analysis of the concentration of skin components (lipids, natural moisturizing factor molecules, water) and the penetration depth of cosmetic/medical formulations in the human stratum corneum (SC) in vivo. In recent years, it was shown that confocal Raman microspectroscopy can also be used for non-invasive in vivo depth-dependent determination of the physiological parameters of the SC, such as lamellar and lateral organization of intercellular lipids, folding properties of keratin, water mobility and hydrogen bonding states. The results showed that the strongest skin barrier function, which is primarily manifested by the orthorhombic organization of intercellular lipids, is provided at ≈20–40% SC depth, which is related to the maximal bonding state of water with surrounding components in the SC. The secondary and tertiary structures of keratin determine water binding in the SC, which is depth-dependent. This paper shows the technical possibility and advantage of confocal Raman microspectroscopy in non-invasive investigation of the skin and summarizes recent results on in vivo investigation of the human SC.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Current Views on Noninvasive in vivo Determination of Physiological Parameters of the Stratum Corneum Using Confocal Raman Microspectroscopy

Darvin

Schleusener

Lademann

et al. 2022

Skin Pharmacol Physiol

View full text Add to dashboard Cite

show abstract

“…The bands at 2850 and 2883 cm À1 belong to the symmetric (n s (CH 2 )) and asymmetric (n as (CH 2 )) stretching vibrations of the CH 2 groups, respectively. 110,111 It is also possible to observe a weak The first is an overtone of wavenumbers in the range of 1400-1495 cm À1 (-CH 2 -bonds); the latter is reported to be the Fermi resonance between the CH 2 symmetric stretching and the overtone from the CH 2 bond. 123 Raman spectroscopy is sensitive to changes in the molecular structure level of PE, such as the degree of crystallinity, which is the key determining factor of PE density (i.e., higher the degree of crystallinity, higher the density).…”

Section: Band Assignment In the Raman Spectra Of Most Common Plastic Polymersmentioning

confidence: 98%

Raman Spectroscopy for the Analysis of Microplastics in Aquatic Systems

2021

View full text Add to dashboard Cite

Raman spectroscopy is gaining ground in the analysis of microplastics, especially due to its high spatial resolution that allows the investigation of small plastic particles, whose numeric abundance is argued to be particularly relevant in aquatic systems. Here, we aimed at outlining the status of Raman analysis of microplastics from aquatic systems, highlighting the advantages and the drawbacks of this technique and critically presenting tools and ways to effectively employ this instrument and to improve the spectra obtained and their interpretation. In particular, we summarized procedural information for the use of Raman spectroscopy, and we discussed issues linked to fluorescence interference and the analysis of weathered polymers, which may complicate the interpretation of Raman signatures. In this context, a deep understanding of the different plastic polymers and their Raman peaks and chemical fingerprints is fundamental to avoid misidentification. Therefore, we provided a catalog with detailed information about peaks of most common plastic polymers, and this represents, to the best of our knowledge, the first comprehensive resource that systematically synthesized plastic Raman peaks. Additionally, we focused on plastic additives, which are contained in the majority of plastics. These compounds are often intense in Raman scattering and may partly or completely overlie the actual material types, resulting in the identification of additives alone or misidentification issue. For these reasons, we also presented a new R package “RamanMP” that includes a database of 356 spectra (325 of which are additives). This will help to foster the use of this technique, which is becoming especially relevant in microplastic analysis.

show abstract

“…PE triggers only a few normal vibrations of infrared activity, due to its simple structure, high symmetry, and low polarity. Nevertheless, PE is extremely suitable for characterization using Raman spectroscopy because of its high activity and great peak intensity in Raman spectra . Figure presents the Raman spectra of SLL‐5 and GUR 4150.…”

Section: Resultsmentioning

confidence: 99%

Nascent particle sizes and degrees of entanglement are responsible for the significant differences in impact strength of ultrahigh molecular weight polyethylene

Huan

Zhao

et al. 2019

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The physical properties of ultrahigh molecular weight polyethylene (UHMWPE) are generally highly dependent on its molecular weight. However, in our study, it was found that two UHMWPE samples of similar molecular weight, SLL‐5 and GUR 4150, have significantly different impact strengths, with the Charpy impact strength of GUR 4150 being almost 3.4 times that of SLL‐5. To reveal the reasons, the structure–property relations of these UHMWPE materials were investigated. Morphologies of the nascent particles and impact fracture surfaces, the melting behavior, rheological behavior, and three‐phase (crystalline, amorphous, and interphase) contents were characterized by scanning electron microscopy, differential scanning calorimetry, advanced rotary rheometer, and Raman spectroscopy, respectively. It was observed that no significant differences in the crystal structures of SLL‐5 and GUR 4150, but GUR 4150 had smaller nascent particles sizes and a lower degree of entanglement when compared with those of SLL‐5. Accordingly, a mechanism to clarify the significant difference in the impact strengths of GUR 4150 and SLL‐5 was developed. More importantly, this work may be useful for improving the preparation technologies and industrial applications of UHMWPE. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 632–641

show abstract

Regularity modes in Raman spectra of polyolefins: Part II. Polyethylene and ethylene copolymers

Cited by 29 publications

References 16 publications

Current Views on Noninvasive in vivo Determination of Physiological Parameters of the Stratum Corneum Using Confocal Raman Microspectroscopy

Current Views on Noninvasive in vivo Determination of Physiological Parameters of the Stratum Corneum Using Confocal Raman Microspectroscopy

Raman Spectroscopy for the Analysis of Microplastics in Aquatic Systems

Nascent particle sizes and degrees of entanglement are responsible for the significant differences in impact strength of ultrahigh molecular weight polyethylene

Contact Info

Product

Resources

About