scholarly journals Characterization Of Thermally Stable Dye-Doped Polyimide Based Electrooptic Materials

1993 ◽  
Vol 328 ◽  
Author(s):  
Michael B. Meinhardt ◽  
Paul A. Cahill ◽  
Carl H. Seager ◽  
Allyson J. Beuhler ◽  
David A. Wargowski
Keyword(s):  
Dye Degradation ◽  
Curing Process ◽  
Polyimide Films ◽  
Scanning Calorimetry ◽  
Thermal Stabilities ◽  
Photothermal Deflection Spectroscopy ◽  
Dye Aggregation ◽  
Donor Acceptor ◽  
Photothermal Deflection

ABSTRACTPreparation and characterization of novel dye-doped polyimide films for electrooptics is described. Thermal stabilities of donor-acceptor 2,5-diaryl oxazoles were evaluated by differential scanning calorimetry. Absorptive losses in thin films of Ultradel 9000D® doped with donor-acceptor oxazoles were measured by photothermal deflection spectroscopy. Absorptive losses at high doping levels may be explainable by dye-dye aggregation or dye degradation during the curing process. Lower doping levels, however, show losses of ≤ 3.0 dB/cm at 830 nm and ≤ 2.4 dB/cm at 1320 nm.

scholarly journals Synthesis and Characterization of K and Eu Binary Phosphides

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 251 ◽  
Author(s):  
Juli-Anna Dolyniuk ◽  
Justin Mark ◽  
Shannon Lee ◽  
Nhon Tran ◽  
Kirill Kovnir
Keyword(s):  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Synthesis And Characterization ◽  
Zintl Phases ◽  
Scanning Calorimetry ◽  
Thermal Stabilities ◽  
Melting Temperatures ◽  
1D Chains

The synthesis, structural characterization, and optical properties of the binary Zintl phases of α-EuP3, β-EuP3, EuP2, and α-K4P6 are reported in this study. These crystal structures demonstrate the versatility of P fragments with dimensionality varying from 0D (P6 rings in α-K4P6) to 1D chains (EuP2) to 2D layers (both EuP3). EuP2 is isostructural to previously reported SrP2 and BaP2 compounds. The thermal stabilities of the EuP2 and both EuP3 phases were determined using differential scanning calorimetry (DSC), with melting temperatures of 1086 K for the diphosphide and 1143 K for the triphosphides. Diffuse reflectance spectroscopy indicated that EuP2 is an indirect semiconductor with a direct bandgap of 1.12(5) eV and a smaller indirect one, less than 1 eV. Both EuP3 compounds had bandgaps smaller than 1 eV.

Synthesis And Properties Of Crosslinkable Phenylacetylene Donor-Acceptor Molecules

1995 ◽  
Vol 413 ◽  
Author(s):  
G. E. Spilman ◽  
T. Jiang ◽  
Q. Lu ◽  
D. C. Martin
Keyword(s):  
Differential Scanning Calorimetry ◽  
Elevated Temperatures ◽  
Functional System ◽  
New Materials ◽  
Scanning Calorimetry ◽  
Active Materials ◽  
Donor Acceptor ◽  
Novel Method ◽  
Acceptor Molecules

ABSTRACTBased on our previous work using benzocyclobutene (BCB) moieties in extended-chain polymers [1], it was thought that the construction of unsymmetrical molecules around the BCB unit might result in thermally crosslinkable NLO-active materials. The feasibility of incorporating such a functional system in donor-acceptor molecules without disrupting processability is discussed and demonstrated. The synthesis, processing, and characterization of these molecules was investigated by thermogravimetry, differential scanning calorimetry, and optical microscopy using a specially designed hot stage which makes it possible to apply an inplane electric field at elevated temperatures. The ability to rapidly and irreversibly crosslink bulk films without the generation of volatile byproducts provides a novel method for sustaining poled optical properties by locking in the desired orientation. The anisotropy of the electrically poled melt and sustained birefringence after BCB crosslinking and cooling demonstrates the achievement of molecular alignment in these new materials.

Thermal characterization of Li-ion cell electrodes by photothermal deflection spectroscopy

2016 ◽  
Vol 325 ◽  
pp. 104-115 ◽  
Author(s):  
André Loges ◽  
Sabrina Herberger ◽  
Daniel Werner ◽  
Thomas Wetzel
Keyword(s):  
Thermal Characterization ◽  
Photothermal Deflection Spectroscopy ◽  
Li Ion ◽  
Photothermal Deflection

Characterization of a-Si1-xCx:H/a-Si:H and a-SiNX:H/a-Si:H heterojunctions by photothermal deflection spectroscopy

1987 ◽  
Vol 97-98 ◽  
pp. 971-974 ◽  
Author(s):  
A. Asano ◽  
T. Ichimura ◽  
M. Ohsawa ◽  
H. Sakai ◽  
Y. Uchida
Keyword(s):  
Photothermal Deflection Spectroscopy ◽  
Photothermal Deflection

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Sign in / Sign up

Export Citation Format

Share Document