TY - JOUR A1 - Just, Ulrich A1 - Jones, D.J. A1 - Krüger, Rita A1 - Davidson, G. A1 - Käppler, K. T1 - SFC/FTIR, SFC/APCI-MS and MALDI-TOF-MS for the analysis of siloxane-ethylene oxide copolymers N2 - Polydimethylsiloxanes (PDMSs) modified by introducing ethylene oxide units with the aim of forming sufficiently water-soluble siloxane compounds were characterized using supercritical fluid chromatography (SFC) coupled with Fourier transform infrared (FTIR) spectroscopy and atmospheric pressure chemical ionization mass spectrometry (APCI–MS), and matrix-assisted laser desorption–ionization time-of-flight mass spectrometry (MALDI–TOF-MS). SFC has a domain in analyzing oligomers. Hyphenated techniques enable elucidation of the components. Remarkable is the resolution and short analysis time of MALDI–TOF-MS. SFC also allows quantification of the basic and reaction products. PY - 2000 U6 - https://doi.org/10.1016/S0165-022X(00)00077-4 SN - 0165-022x IS - 43 SP - 209 EP - 221 PB - Elsevier CY - Amsterdam AN - OPUS4-11336 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Käppler, K. A1 - Scheim, U. A1 - Keidel, Frank A1 - Just, Ulrich T1 - SFC-MS and GC-MS identification of differently functionalized siloxanes T2 - 17th International Symposium on Capillary Chromatography and Electrophoresis CY - Wintergreen, VA, USA DA - 1995-05-07 PY - 1995 AN - OPUS4-11110 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Keidel, Frank A1 - Just, Ulrich A1 - Käppler, K. A1 - Scheim, U. T1 - Identification of low molecular vaporizable components in silicone resins using gas chromatography/mass spectrometry PY - 1996 SN - 0937-0633 IS - 354 SP - 21 EP - 26 PB - Springer CY - Berlin AN - OPUS4-1425 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Keidel, Frank A1 - Wachholz, Sigrid A1 - Just, Ulrich A1 - Geißler, Heinz A1 - Käppler, K. T1 - Analysis of siloxane pyrolysis products by cryo-GC/FT-IR and GC/MS PY - 1995 U6 - https://doi.org/10.1007/BF00323377 SN - 0937-0633 VL - 352 IS - 5 SP - 515 EP - 520 PB - Springer CY - Berlin AN - OPUS4-1424 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Keidel, Frank A1 - Wachholz, Sigrid A1 - Just, Ulrich A1 - Geissler, H. A1 - Käppler, K. T1 - Analysis of a mixture of linear and cyclic siloxanes by cryo-gas chromatography-Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry N2 - A mixture of linear and cyclic methylsiloxanes was analysed to characterize the different types of siloxane structures using gas chromatography (GC), mass spectrometry (MS) and Fourier transform infrared (FT-IR) spectroscopy. Siloxane structures are formed by hydrolysis of dimethyldichlorosilane under controlled conditions in technical applications. In the presence of methyltrichlorosilane or even trimethylchlorosilane, linear polydimethylsiloxanes and mono-, bi- or polycyclic methylsiloxanes are synthesized depending on the reaction conditions. The main structural units are (CH3)3SiO1, (CH3)2SiO and (CH3)SiO3. GC-MS may provide molecular mass information, but it is not able to identify isomeric structures, which are also formed in lower quantities by the mentioned reactions. Coupling GC with FT-IR enables the determination of group frequencies to assign specific structures. Thus, combination of GC with MS and FT-IR may be used in elucidating complex cyclosiloxane compounds. FT-IR measurements were performed with a Tracer unit. PY - 1995 U6 - https://doi.org/10.1016/0021-9673(94)01115-U SN - 0021-9673 VL - 693 IS - 1 SP - 89 EP - 99 PB - Elsevier CY - Amsterdam AN - OPUS4-1422 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -