TY - JOUR A1 - Buchberger, E. M. A1 - Kungl, A. A1 - Hennecke, Manfred A1 - Kauffmann, H. F. T1 - Energy transfer in a polymer donor/acceptor system - Analysis of distributed transfer rates from transient fluorescence data - The exponential serries method PY - 1992 SN - 0032-3934 VL - 33 SP - 857 EP - 858 PB - American Chemical Society CY - Newark, NJ AN - OPUS4-23223 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Friedrich, Jörg Florian A1 - Wettmarshausen, Sascha A1 - Hennecke, Manfred T1 - Haloform plasma modification of polyolefin surfaces N2 - Polyolefin surfaces (polyethylene and polypropylene) were exposed to haloform (CHX3) plasmas for introduction of monosort halogen groups. Bromoform and chloroform plasmas produced selectively C-Br (100 Br/100 C) and C-Cl (200 Cl/100 C) groups in high yields. The bromoform plasma showed 1-3 and the chloroform plasma 2-7 post-plasma introduced O-functionalities per 100 C. The polyolefin C-Br groups were grafted wet-chemically or by exposure to the vapour of amines, diols and glycols. Thus, spacer molecules could be covalently bonded to maximal 15 spacer molecules per 100 C for the smallest grafted molecules and 1.2 molecules/100 C for larger molecules as octaaminophenylene-POSS. After metal evaporation the end groups of these polymer-bonded spacer molecules formed also covalent bonds to the metal. Thus, flexible, hydrophobic and barrier elements were introduced into the polymer-metal interfaces for high-impact, high-durable and water-resistant metal-polymer composites as measured by means of peel strengths. KW - Bromination KW - Chlorination KW - Selective plasma processes KW - Spacer grafting PY - 2009 DO - https://doi.org/10.1016/j.surfcoat.2009.05.050 SN - 0257-8972 VL - 203 IS - 23 SP - 3647 EP - 3655 PB - Elsevier Science CY - Lausanne AN - OPUS4-23204 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Damerau, Thomas A1 - Sabelus, Silke A1 - Wachtendorf, Volker A1 - Hennecke, Manfred A1 - Greiner, A. T1 - Photochemische und thermische Stabilität eines Phenylen-Vinylen-Polymeren KW - Photostability KW - Fluorescence KW - Chemiluminescence PY - 1996 SN - 0016-3538 VL - 40 IS - 7 SP - 710 EP - 712 PB - GIT-Verlag CY - Darmstadt AN - OPUS4-23205 LA - deu 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 DO - 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 - GEN A1 - Hennecke, Manfred A1 - Sabelus, Silke T1 - Intramolecular excimers in vinylarylpolymers - Influence of molecular weight and tacticity T2 - ACS Fall National Meeting CY - Washington, D.C., USA DA - 1994-08-21 PY - 1994 SN - 0-8412-2955-4 SN - 0743-0515 N1 - Serientitel: Polymeric materials science and engineering – Series title: Polymeric materials science and engineering VL - 71 SP - 421 EP - 422 PB - ACS Publ. CY - Washington, DC AN - OPUS4-23228 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hennecke, Manfred A1 - Damerau, Thomas ED - Urban, M. W. ED - Provder, T. T1 - Photophysical behavior of phenylene-vinylene-polymers as studied by polarized fluorescence spectroscopy T2 - ACS Fall National Meeting CY - Washington, D.C., USA DA - 1994-08-21 PY - 1995 SN - 0-8412-3262-8 SN - 0097-6156 N1 - Serientitel: ACS Symposium Series – Series title: ACS Symposium Series SP - 446 EP - 457 PB - American Chemical Society CY - Washington, DC AN - OPUS4-23232 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hennecke, Manfred A1 - Damerau, Thomas T1 - Photophysical behavior of phenylene-vinylene-polymers as studied by polarized fluorescence spectroscopy T2 - ACS Fall National Meeting CY - Washington, D.C., USA DA - 1994-08-21 PY - 1994 SN - 0-8412-2955-4 SN - 0743-0515 N1 - Serientitel: Polymeric materials science and engineering – Series title: Polymeric materials science and engineering VL - 71 SP - 75 EP - 76 PB - ACS Publ. CY - Washington, DC AN - OPUS4-23236 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Plewinsky, Bodo A1 - Hennecke, Manfred A1 - Oppermann, W. ED - Czichos, Horst ED - Hennecke, Manfred T1 - Chemie PY - 2008 SN - 978-3-540-71851-2 DO - https://doi.org/10.1007/978-3-540-71852-9_3 SP - C1 EP - C114 PB - Springer CY - Berlin AN - OPUS4-23242 LA - deu 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 DO - 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 - JOUR A1 - Hennecke, Manfred A1 - Kurz, K. A1 - Fuhrmann, J. T1 - Molecular orientation of hot-drawn poly(butylene terephthalate) films as determined from the intrinsic polarized fluorescence N2 - As far as indicated by the spectra and the fluorescence time decay law, the properties of the fluorescence of poly(butylene terephthalate) (PBT) are almost identical to those of PET. The groundstate- stable sandwich dimers in the noncrystalline regions of uniaxially-drawn PBT films were used as chainintrinsic fluorescent labels for studying the orientation distribution function. The dimers are formed only in the amorphous regions; concerning the fluorescence signal, "amorphous" includes all the material outaide perfect crystallites. During deformation, the orientation coefficient F of the dimers follows approximately a superposition curve of crystallite-like orientation, easily separable in the initial range of stretching ratio λ < 2.5, and of true-amorphous orientation of the affine network type that becomes noticeable at λ > 3. The total fluorescence intensity of PBT, if excited at the proper wavelength, is proportional to the concentration of the dimers; it remains constant in the initial range of stretching, i.e. λ < 1.5. At higher λ, correlated to the increase of amorphous orientation, a strong increase of the dimer concentration, up to a factor of 6, is observed. PY - 1992 DO - https://doi.org/10.1021/ma00049a016 SN - 0024-9297 SN - 1520-5835 VL - 25 IS - 23 SP - 6190 EP - 6194 PB - American Chemical Society CY - Washington, DC AN - OPUS4-23161 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hennecke, Manfred A1 - Wadle, A. T1 - A photoselection study on the fluorescence of pyrenebutyric acid in solution N2 - Measurements with linearly polarized exciting and fluorescent light show that the excimerlike fluorescence of pyrenebutyric acid in alkaline solution is polarized. The degree of polarization r depends on temperature and, very pronounced, on the wavelength of excitation. This occurs in the spectral region where the excitation spectrum of the excimer differs from the corresponding monomer spectrum. The value of r, after correction of rotational depolarization, is 0.36 and indicates that single transition moments of absorption and emission coincide nearly in their direction. These results, together with the fluorescence time decay laws, strongly support the conclusion that, at least in an hydrophilic surrounding, not excimers but ground-state stable dimers of pyrene are formed. PY - 1992 DO - https://doi.org/10.1063/1.463190 SN - 0021-9606 SN - 1089-7690 VL - 97 IS - 2 SP - 871 EP - 874 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-23163 LA - eng 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 DO - 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 - 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 DO - 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 -