TY - JOUR T1 - Amts- und Mitteilungsblatt, Band 21, Heft 4 T3 - Amts- und Mitteilungsblatt der BAM - 4/1991 PY - 1991 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-558369 SN - 0340-7551 VL - 21 IS - 4 SP - 669 EP - 1010 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-55836 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR T1 - Amts- und Mitteilungsblatt, Band 21, Heft 3 T3 - Amts- und Mitteilungsblatt der BAM - 3/1991 PY - 1991 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-558372 SN - 0340-7551 VL - 21 IS - 3 SP - 363 EP - 672 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-55837 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR T1 - Amts- und Mitteilungsblatt, Band 21, Heft 1 T3 - Amts- und Mitteilungsblatt der BAM - 1/1991 PY - 1991 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-558398 SN - 0340-7551 VL - 21 IS - 1 SP - 1 EP - 222 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-55839 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR T1 - Amts- und Mitteilungsblatt, Band 21, Heft 2 T3 - Amts- und Mitteilungsblatt der BAM - 2/1991 PY - 1991 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-558389 SN - 0340-7551 VL - 21 IS - 2 SP - 219 EP - 366 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-55838 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Weltschev, Margit ED - Hohmeyer, O. ED - Ottinger, R. L. T1 - Economic Losses to society Due to Material Damages of Environmental Pollution in the Federal Republic of Germany BT - Analysis and Internalization N2 - In Order to be able to assess the damage caused to materials by acid deposition the first question to be considered is: Which materials are affected? A wide ränge of materials are exposed to the extemal environment. These materials have different susceptibility to attack by acid rain and different stock at risk in the Federal Republic of Germany. KW - Economic Losses KW - Environmental Pollution PY - 1991 SN - 3-540-54184-5 SP - 25 EP - 35 PB - Springer CY - Berlin AN - OPUS4-51494 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bäßler, H. A1 - Bradley, D.D.C. A1 - Hennecke, Manfred T1 - Exciton versus band description of the absorption spectrum in poly(p-phenylene vinylene) PY - 1991 U6 - https://doi.org/10.1016/0379-6779(91)91597-4 SN - 0379-6779 VL - 41 IS - 3 SP - 1249 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-23246 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kruse, A. A1 - Hennecke, Manfred A1 - Baalmann, A. A1 - Schlett, V. A1 - Stuke, H. T1 - Bindungsstruktur in plasmapolymerisierten Schichten aus Vinyltrimethylsilan N2 - Plasma polymer films of vinyltrimethylsilane (VTMS) were deposited by radiofrequency (RF. 13.56 MHz) or Microwave (MW, 2.45 GHz) discharges in two reactors of the same volume and geometry. — The polymer films were characterized by electron spectroscopy for chemical analysis (ESCA) and infrared spectroscopy (FTIR). It turned out, that the RF — and the MW — polymers had almost the same Si/C-composition ratio of 1/5 in the entire range of RF-and MW-power (60-150 W). Although the Si/C film-composition remains almost constant, the binding states of Si-and C-atoms in the respective ESCA-spectra are changing. While the CSi part of the C1s-peak increases with the RF-or MW-power, the C-H/C-C part of the peak decreases, indicating a loss of hydrogen in the polymer films. — Obviously the fragmentation of the VTMS-monomer is quite different for the two types of plasma discharges. While films of the RF-plasma clearly show strong contributions of the methyl and vinyl groups, these groups are completely missing for the MW-plasma polymers. — From these results structure models of the plasma polymers have been developed. KW - PECVD KW - Polymers KW - Spectroscopy PY - 1991 U6 - https://doi.org/10.1002/bbpc.19910951111 SN - 0005-9021 VL - 95 IS - 11 SP - 1376 EP - 1380 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-23185 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hennecke, Manfred T1 - On the transfer of excitation energy in poly(P-phenylenevinylene) as studied by fluorescence depolarization N2 - Measurements of polarized excitation and fluorescence spectra were carried out with thin films of PPV and with films of oligomer model compounds in a polystyrene matrix. The degree of fluorrescece polarization r and its spectral dependence are discussed with respect to the transfer of excitation energy and the mutual alignment of the flurophores. In contrast to the behaviour of conventional aromatic polymers, the value of r is non-zero in isotropic PPV and depends on preparation (up to r = 0.25 at λexc = 460 nm and λflu = 555 nm). r can be nearly as high as in the dilute solid solution of the oligomers. This is easily understood if the PPV segments are highly aligned in the distance range of energy transfer. PY - 1991 U6 - https://doi.org/10.1016/0379-6779(91)91606-B SN - 0379-6779 VL - 41 IS - 3 SP - 1281 EP - 1284 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-23184 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hennecke, Manfred A1 - Kauffmann, H. F. T1 - On the fluorescence depolarization in bis-(N-carbazolyl) compounds N2 - If the intramolecular distance between the two isoenergetic chromophores of a bichromophoric compound is much smaller than the Förster radius of excitation energy transfer (EET), the probability to fluoresce is equal for both chromophores, because the EET takes place at a shorter time compared with the nanosecond timescale of the fluorescence lifetime. Then, the fluorescence depolarization of diluted solid solutions of such bichromophoric molecules can be measured with stationary excitation and used to evaluate the orientation between the two chromophores; in the most simple case the angle between their main axes is determined. Model calculations for bichromophoric alkane compounds with various conformational freedom reveal the amount of depolarization and thus the limits of the method. The results are compared to experimental data of 1,3-di(N-carbazolyl)-propane and 1,2-trans-di(N-carbazolyl)cyclobutane. PY - 1991 U6 - https://doi.org/10.1016/0301-0104(91)89031-5 SN - 0301-0104 SN - 1873-4421 VL - 158 SP - 391 EP - 399 PB - Elsevier CY - Amsterdam AN - OPUS4-23158 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hennecke, Manfred A1 - Wachtendorf, Volker A1 - Fuhrmann, J. T1 - Gelchromatographische und spektroskopische Untersuchungen an Asphaltenen T2 - Kolloquium des Sonderforschungsbereichs 134 CY - Clausthal-Zellerfeld, Germany DA - 1991-11-21 PY - 1991 AN - OPUS4-23032 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -