CPMAS 13C-NMR spectra at 75 MHz with spinning side band suppression are presented for a series of epoxy resins cured with a variety of commercially important hardeners. The hardeners can be readily identified from the spectra; the high-field is important for distinguishing between related amine hardeners.
A method has been developed for the analysis of copolyether polyesters, based on chemical cleavage by transesterification followed by gas chromatography. The 1,4-butanediol and polyether parts were acetylated prior to gas chroamtography. It was thus possible to differentiate between the butanediol originating from the soft, polyether part and that resulting from the hard segment of the copolyether polyester. Pyrolysis—gas chromatography was found to be eminently suitable for a preliminary identification of the copolyether polyester and its differentiation from poly(1,4-butnediol terephthalate).
Abstract Pyrolysis—gas chromatography was used to determine the polymeric hinderedarmine light stabilisers Tinuvin 622 and Chimassorb 944, which are used in various plastics, especially polyolefins. By performing pyrolysis—gas chromatography on two different stationary phases, it was possible to differentiate accurately between five commercial stabilisers of which two are of the polymeric type (mentioned above), and three have well-defined molecular masses (Tinuvin 144, Tinuvin 770 and Hostavin TM N 20). An extraction procedure, which allows a semi-quantitative determination of the polymeric stabilisers, is described.
High-performance liquid chromatography is used to determine light stabilisers in plastic materials. Most of the light stabilisers in commercial use can be separated on a reversed-phase column. Stabilisers which elute together on this column are successfully separated on a silica column. For quantitative analysis of PVC and its blends, different extraction methods were compared for the light stabilisers. The best results were obtained by using Soxhlet extraction of finely milled material.
The identification of single fibres and fibre blends by means of pyrolysis gas chromatography is described. The pyrograms are interepreted with the aid of identified peaks which are diagnostic for each fibre rather than by the pattern recognition method. This method of diagnostic peaks is especially useful for the identification of fibre blends.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Radiolytic Isotopic Exchange of Gaseous NitrogenM. Anbar and P. PerlsteinCite this: J. Phys. Chem. 1966, 70, 6, 2052–2053Publication Date (Print):June 1, 1966Publication History Published online1 May 2002Published inissue 1 June 1966https://pubs.acs.org/doi/10.1021/j100878a505https://doi.org/10.1021/j100878a505research-articleACS PublicationsRequest reuse permissionsArticle Views15Altmetric-Citations10LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotope Exchange in Gaseous Nitrogen under X-Ray and Cobalt-60 γ-IrradiationM. Anbar and P. PerlsteinCite this: J. Phys. Chem. 1964, 68, 5, 1234–1237Publication Date (Print):May 1, 1964Publication History Published online1 May 2002Published inissue 1 May 1964https://pubs.acs.org/doi/10.1021/j100787a507https://doi.org/10.1021/j100787a507research-articleACS PublicationsRequest reuse permissionsArticle Views20Altmetric-Citations7LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
