TY - JOUR A1 - Mehner, Hartmut A1 - Menzel, Michael A1 - Müller, J.-P. A1 - Gähde, J. A1 - Güttler, B. T1 - Plasma-assisted transformation of iron surfaces into magnetite KW - Iron KW - Magnetite KW - Mössbauer spectroscopy KW - Plasma oxidation PY - 1999 SN - 0257-8972 VL - 116-119 SP - 367 EP - 369 PB - Elsevier Science CY - Lausanne AN - OPUS4-773 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mix, Renate A1 - Gähde, J. A1 - Goering, Harald A1 - Schulz, Günter T1 - Segmented polyurethanes with 4,4-bis-(6-hydroxyhexoxy)biphenyl as chain extender - Part 2. Synthesis and properties of MDI-polyurethanes in comparison with 2,4-TDI-polyurethanes N2 - Linear segmented polyurethanes based on poly(butylene adipate)s (PBA) of different molecular weight (Mn 2000, 1000, and 600), 4,4-diphenylmethane diisocyanate (MDI) and the mesogenic diol 4,4-bis-(6-hydroxyhexoxy)biphenyl (BHHBP) as well as the unsegmented polyurethane consisting of MDI/BHHBP units have been synthesized and characterized by elemental analysis, 13C-NMR and SEC. The thermal behavior and the morphology were studied by DSC, polarizing microscopy, and DMA. The properties of the MDI-polyurethanes were discussed in relation to the BHHBP chain extended 2,4-TDI-polyurethanes and common 1,4-butanediol chain-extended MDI products. MDI polyurethanes based on PBA (Mn 2000) exhibit a glass transition temperature Tg of about -40°C independent of the hard segment content up to 50% hard segments. At higher hard segment contents increasing Tgs were observed. Polyurethanes, based on the shorter polyester soft segments PBA (Mn 1000 or 600), reveal an increase in the glass transition temperatures with growing hard segment content. The thermal transitions caused by melting of the MDI/BHHBP hard segment domains are found at 50 K higher temperatures in comparison with the analogous TDI products with mesogenic BHHBP/TDI hard segments. Shortening of the PBA chain length causes a shift of the thermal transitions to lower temperatures. Polarizing microscopy experiments indicate that liquid crystalline behavior is influenced by both the content of mesogenic hard segments and the chain length of the polyester. © 1996 John Wiley & Sons, Inc. PY - 1996 DO - https://doi.org/10.1002/(SICI)1099-0518(19960115)34:1<33::AID-POLA3>3.0.CO;2-4 SN - 0360-6376 SN - 0887-624X VL - 34 IS - 1 SP - 33 EP - 44 PB - Wiley CY - Hoboken, NJ AN - OPUS4-2151 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gähde, J. A1 - Mix, Renate A1 - Krüger, Ralph-Peter A1 - Goering, Harald A1 - Funke, W. A1 - Hermann, U. T1 - Adherence of Liquid Crystalline TDI-Polyurethanes to Steel KW - Main-chain liquid crystalline polyurethanes KW - Primer on steel KW - Pull-off test KW - Wet adhesion of alkyd melamine resin KW - Mesogenic unit KW - Glass transition temperature KW - Hard segments KW - Soft segments PY - 1996 SN - 0021-8464 SN - 1545-5823 VL - 58 SP - 243 EP - 251 PB - Gordon & Breach CY - New York, NY AN - OPUS4-2152 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Geng, Sh. A1 - Friedrich, Jörg Florian A1 - Gähde, J. A1 - Guo, L. T1 - Surface-Enhanced Infrared Absorption (SEIRA) and Its Use in analysis of Plasma-Modified Surface KW - Plasma KW - IR KW - Surface-enhanced infrared absorption (SEIRA) KW - Surface modification PY - 1999 SN - 0021-8995 SN - 1097-4628 VL - 71 SP - 1231 EP - 1237 PB - Wiley InterScience CY - Hoboken, NJ AN - OPUS4-6985 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gähde, J. A1 - Fischer, T. A1 - Falkenhagen, Jana A1 - Dittmar, A. A1 - Gnauck, R. T1 - Interaction of Polyurethane Model Compounds with Metal Oxides KW - Polyurethane model compounds KW - Mono layers KW - Specific interaction at oxide surfaces KW - Catalyzed hydrolysis PY - 1997 SN - 0021-8995 SN - 1097-4628 VL - 64 SP - 2449 EP - 2455 PB - Wiley InterScience CY - Hoboken, NJ AN - OPUS4-2156 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gähde, J. A1 - Friedrich, Jörg Florian A1 - Fischer, T. A1 - Unger, Wolfgang A1 - Lippitz, Andreas A1 - Falkenhagen, Jana T1 - Reactions of polymer analogous model substances with metals and oxides KW - Modellverbindung KW - Al202 KW - Chrom KW - Orientierung, molekular KW - Chemical interaction KW - Model compounds KW - Al2O3 and chromium KW - Molecular orientation KW - Formation of complexes KW - Plasma PY - 1996 SN - 0340-255x SN - 1437-8027 VL - 101 SP - 194 EP - 198 PB - Springer CY - Berlin AN - OPUS4-685 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -