Characterization of Silicone Rubber Extracts Using Gel-Permeation Chromatography, Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry, Electrospray Ionization Mass Spectrometry, Fourier Transform Infrared Spectroscopy and Gas Chromatography/Mass Spectrometry

Abstract

Extracts from a silicone rubber product were characterized by gel-permeation chromatography (GPC), matrix-assisted laser desorption/ionization time-of-flight (MALDI-ToF) mass spectrometry, Fourier transform infrared spectroscopy (FT-IR), electrospray time-of-flight (ESI-ToF) mass spectrometry and gas chromatography/mass spectrometry (GC/MS). The extracted sample was determined to be a complex mixture with a molecular weight ranging from 200 to 210,000 Da as determined from GPC measurements. GPC fractions of the extract sample were further analyzed by MALDI-ToF mass spectrometry, ESI-ToF mass spectrometry, FT-IR spectroscopy and GC/MS. The extracted products were determined to be macrocyclic poly(dimethylsiloxane) oligomers. Two additives known as bis(2-ethylhexyl) adipate and bis(2-ethylhexyl) phthalate were observed in the extract.

Oligomeric carbon and siloxane series observed by matrix‐assisted laser desorption/ionisation and laser desorption/ionisation mass spectrometry during the analysis of soot formed in fuel‐rich flames

“…Chmelik and co‐workers have characterised silicone oils by MALDI‐MS3,4 and compared these results with data from super‐critical fluid chromatography; the distributions of oligomers identified by the two methods were comparable. Silicone rubber extracts have also been examined by gel permeation chromatography (GPC) using toluene as eluent, MALDI‐MS using dithranol as matrix doped with sodium nitrate, and by other methods 5. MALDI‐MS showed oligomers up to m/z 18 000, while GPC indicated a mass range up to 210 000 u. Silicone films are made for pharmaceutical purposes by heat‐treating the silicone fluid on glass; samples of silicone have been examined by size exclusion chromatography (SEC) and high‐temperature GC;6 chain lengths of 25 to 45 siloxane units were detected.…”

A Modified Thermal Deposition Unit for Gel-Permeation Chromatography with Matrix-Assisted Laser Desorption/Ionization and Electrospray Ionization Time-of-Flight Analysis

“…We do not observe any high-mass cyclized or branched oligomers in this sample which potentially occur in many polysiloxane-based products. 9 We have realized an added advantage to preparing the fractionated polymer as illustrated in Figure 1(c). After MALDI analysis, most of the fractionated polymer sample remains unconsumed.…”

Supramolecular [6]Chochin and “Big Mac” Made from Chiral Piedfort Assemblies

“…Detailed analyses of PDMS polymers have been previously performed by direct pyrolysis/MS (Py/MS),10 secondary ion mass spectrometry,11, 12 matrix‐assisted laser desorption/ionization (MALDI) or electrospray ionization (ESI)‐MS techniques 13, 14. Similarly, the approach chosen for the present study aimed at the structural characterization of an unknown sample of silicones submitted for analysis by the dermatology facilities of the Bichat Hospital (Paris), consisting of the use of several MS techniques (Py/GC/MS, ESI‐MS, MALDI‐MS, LC/MS).…”