Non-destructive determination of the cross-linking degree of EVA by Raman Spectroscopy

2014 ◽  
Vol 2014 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Cornelia Peike ◽  
◽  
Witchuda Phondongnok ◽  
Thomas Kaltenbach ◽  
Karl-Anders Weiss ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cross Linking ◽  
The Cross ◽  
Non Destructive

scholarly journals Single-sided NMR for the measurement of the degree of cross-linking and curing

2018 ◽  
Vol 7 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Norbert Halmen ◽  
Christoph Kugler ◽  
Eduard Kraus ◽  
Benjamin Baudrit ◽  
Thomas Hochrein ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Curing Kinetics ◽  
Cross Linking ◽  
Scanning Calorimetry ◽  
First Results ◽  
Non Destructive ◽  
Kinetics Of ◽  
Good Agreement

Abstract. The degree of cross-linking and curing is one of the most important values concerning the quality of cross-linked polyethylene (PE-X) and the functionality of adhesives and resin-based components. Up to now, the measurement of this property has mostly been time-consuming and usually destructive. Within the shown work the feasibility of single-sided nuclear magnetic resonance (NMR) for the non-destructive determination of the degree of cross-linking and curing as process monitoring was investigated. First results indicate the possibility of distinguishing between PE-X samples with different degrees of cross-linking. The homogeneity of the samples and the curing kinetics of adhesives can also be monitored. The measurements show good agreement with reference tests (wet chemical analysis, differential scanning calorimetry, dielectric analysis). Furthermore, the influence of sample temperature on the characteristic relaxation times can be observed.

Determination of the cross-linking degree of commercial ethylene-vinyl-acetate polymer by luminescence spectroscopy

2014 ◽  
Vol 21 (5) ◽  
Author(s):  
Jan Caspar Schlothauer ◽  
Rojonirina Maryline Ralaiarisoa ◽  
Arnaud Morlier ◽  
Marc Köntges ◽  
Beate Röder
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Luminescence Spectroscopy ◽  
Cross Linking ◽  
The Cross

scholarly journals Raman Spectroscopy Enables Non-Invasive Identification of Mycotoxins p. Fusarium of Winter Wheat Seeds

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 587
Author(s):  
Maksim N. Moskovskiy ◽  
Aleksey V. Sibirev ◽  
Anatoly A. Gulyaev ◽  
Stanislav A. Gerasimenko ◽  
Sergey I. Borzenko ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Winter Wheat ◽  
Accurate Identification ◽  
Non Invasive ◽  
Visual Identification ◽  
Seed Analysis ◽  
Spectroscopic Signatures ◽  
Non Destructive ◽  
Wheat Seeds

Identification of specific mycotoxins p. Fusarium contained in infected winter wheat seeds can be achieved by visually recognizing their distinctive phenotypic species. The visual identification (ID) of species is subjective and usually requires significant taxonomic knowledge. Methods for the determination of various types of mycotoxins of the p. Fusarium are laborious and require the use of chemical invasive research methods. In this research, we investigate the possibility of using Raman spectroscopy (RS) as a tag-free, non-invasive and non-destructive analytical method for the rapid and accurate identification of p. Fusarium. Varieties of the r. Fusarium can produce mycotoxins that directly affect the DNA, RNA and chemical structure of infected seeds. Analysis of spectra by RS methods and chemometric analysis allows the identification of healthy, infected and contaminated seeds of winter wheat with varieties of mycotoxins p. Fusarium. Raman seed analysis provides accurate identification of p. Fusarium in 96% of samples. In addition, we present data on the identification of carbohydrates, proteins, fiber and other nutrients contaminated with p. Fusarium seeds obtained using spectroscopic signatures. These results demonstrate that RS enables rapid, accurate and non-invasive screening of seed phytosanitary status.

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