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Direct analysis of oligomeric tackifying resins in rubber compounds by automatic thermal desorption gas chromatography/mass spectrometry
Author(s) -
Kim Seung Wook
Publication year - 1999
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19991230)13:24<2518::aid-rcm820>3.0.co;2-2
Subject(s) - chemistry , vulcanization , mass spectrometry , natural rubber , gas chromatography–mass spectrometry , rosin , gas chromatography , chromatography , thermal desorption , pyrolysis , phenol , extraction (chemistry) , desorption , analytical chemistry (journal) , organic chemistry , resin acid , adsorption
Two analytical methods, automatic thermal desorption gas chromatography/mass spectrometry (ATD‐GC/MS) and pyrolysis gas chromatography/mass spectrometry (Py‐GC/MS), were applied as direct methods for the analysis of oligomeric tackifying resins in a vulcanized rubber. The ATD‐GC/MS method, based on discontinuous volatile extraction, was found to be an effective means for direct analysis of the oligomeric tackifying resins contained in a vulcanized rubber. The oligomeric tackifying resins, such as t ‐octylphenolformaldehyde (TOPF) resin, rosin‐modified terpene resin, and cashew resin, could be directly analyzed in vulcanized rubber by ATD‐GC/MS. Much simpler total ion chromatograms were obtained by ATD‐GC/MS than by flash pyrolysis with a Curie‐point pyrolyzer, permitting much easier interpretation. Ions at m/z 206, 135, and 107 were fingerprints in the characteristic mass spectra obtained by ATD‐GC/MS for TOPF resin in the vulcanized rubber. 1H‐Indene, styrene, and isolongifolene were observed as their characteristic mass spectra in the pyrolyzate of the rosin‐modified terpene resin. From the cashew resin, phenol, 3‐methylphenol, and 4‐(1,1,3,3‐tetramethylbutyl)phenol were obtained as the characteristic pyrolyzates by discontinuous thermal extraction via ATD‐GC/MS. © 1999 John Wiley & Sons, Ltd.