26 research outputs found
Twist glass transition in regioregulated poly(3-alkylthiophenes)s
The molecular structure and dynamics of regioregulated poly(3-butylthiophene)
(P3BT), poly(3-hexylthiophene)(P3HT), and poly(3-dodecylthiophene) (P3DDT) were
investigated using Fourier transform infrared absorption (FTIR), solid state
C nuclear magnetic resonance (NMR), and differential scanning
calorimetry (DSC) measurements. In the DSC measurements, the endothermic peak
was obtained around 340 K in P3BT, and assigned to enthalpy relaxation that
originated from the glass transition of the thiophene ring twist in crystalline
phase from results of FTIR, C cross-polarization and magic-angle
spinning (CPMAS) NMR, C spin-lattice relaxation time measurements, and
centerband-only detection of exchange (CODEX) measurements. We defined this
transition as {\it twist-glass transition}, which is analogous to the plastic
crystal - glassy crystal transition.Comment: 9 pages, 10 figures, 2 tables. Phys.Rev.B, in pres
First results of material charging in the space environment
A satellite experiment, designed to measure potential charging of typical thermal control materials at near geosynchronous altitude, was flown as part of the SCATHA program. Direct observations of charging of typical satellite materials in a natural charging event ( 5 keV) are presented. The results show some features which differ significantly from previous laboratory simulations of the environment
"2H NMR Relaxationsuntersuchungen an niedermolekularen organischen Glasbildern im viskosen Bereich und im Glas
Available from TIB Hannover: MA 7536 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
CEPPAD
The CEPPAD Experiment consists of four sensors for investigating energetic particle phenomena on the POLAR mission. These sensors provide 3-D proton and electron angular distributions in the energy range of 20 keV to 1 MeV, energetic proton and electron measurements extending to energies greater than 10 MEV, high angular and time resolution measurements in the loss-cone, and data on energetic neutral particles. All sensors operate in conjunction with special on-board data processing units which control sensor data acquisition modes while performing in-flight data processing, data compression, and telemetry formatting. Presented here is a CEPPAD system overview together with descriptions of the individual sensors, the in-flight data processing, and examples of sensor calibration data