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  • 1
    Electronic Resource
    Electronic Resource
    Oxadiazole-containing material with intense blue phosphorescence emission for organic light-emitting diodes (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 4-6 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 2-(2-hydroxyphenyl)-5-phenyl-1, 3, 4-oxadiazole (HOXD), characteristic of excited state intramolecular proton-transfer (ESIPT), was synthesized and found to emit strong blue phosphorescence in the solid state at room temperature and at low temperature (77 K). The photoluminescent spectrum measurement in solution showed that there are two kinds of emission: fluorescence originated from the singlet state and phosphorescence derived from the triplet state in HOXD formed by ESIPT. For the photoluminescent spectrum in the solid state, only phosphorescence emission with the lifetime of 66 μs was observed. Multiple-layer light-emitting diodes with the configuration of ITO/NPB/HOXD/BCP/Alq3/Mg:Ag were fabricated using HOXD as emitter and the maximum brightness of 656 cd/m2 and the luminous efficiency of 0.14 lm/W was obtained. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1491288
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  • 2
    Electronic Resource
    Electronic Resource
    A Rare-Earth Catalyst Capable of Modulating the Stereocontrol of Isoprene Polymerization (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 4397-4398 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00093a047
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  • 3
    Electronic Resource
    Electronic Resource
    Proton NMR study on the molecular motion and conformation of polyaniline doped with HCl (1989)
    Springer
    Polymer bulletin 21 (1989), S. 221-228 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Proton NMR spectra and spin-lattice relaxation time (T1) for polyaniline doped with HCl were measured at 90MHz over a temperature range of 110–430K. A narrow line with a width of about 1–2KHz superimposed on broad NMR peak was observed above 210K, and it was tentatively assigned to the protons in dopant and absorbed water. The analysis of linewidths and second moments for the broad lines reveal two distinct relaxation processes with activation energies of 1.9 and 7.8Kcal./mole,respectively. The former may be associated with the motion of the dopant and water absorbed and the latter with the rotation of benzoid ring about C-N bond axis. The second moment data suggest that the twist angle between the adjacent rings decreases with rising the doping ratio. Proton NMR relaxation rate was fitted with a theoretical equation containing the contributions from nuclear dipolar interaction and from electron-proton interaction, Rd and Rp, respectively.Rd is negligible below room temperature and Rp has little change above 100K. The total relaxation rate is dominated by Rp near room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266177
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic motion of HCIO4-doped polytoluidine studied by varying-frequency proton NMR relaxation (1988)
    Springer
    Polymer bulletin 20 (1988), S. 311-316 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Proton spin-lattice relaxation times (T1) in poly-o-toluidine doped with HC104 were measured over a frequency range from 20 to 90 MHz at room temperature. It was found that there are at least two kinds of phase structures with definitely distinguishable T1 values in moderate doped samples. The spin-lattice relaxation rate (T1 −1) exhibits a maximum at the doping ratio of about 20%. The frequency dependence of (T1 −1) reveals that the electrons predominantly perform an intrachain diffusive motion above 50 MHz and below this frequency an interchain hopping of electrons takes place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261986
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum (1989)
    Springer
    Polymer bulletin 22 (1989), S. 652-652 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00718948
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  • 6
    Electronic Resource
    Electronic Resource
    Cationic transannular polymerization of 1,5-cyclooctadiene (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 733-742 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The cationic transannular oligomerization of cis-cis-1,5-cyclooctadiene (1), initiated by AlEtCl2 and Al2Et3Cl3, was studied. Several cationic catalysts were examined, and the order of activities of these catalysts was found to be the following one: BF3 · OEt2 〈 AlCl3 〈 AlEtCl2 〈 Al2Et3Cl3. The number-average molecular weights of the resultant polymers are ≈ 1000 - 2000, and the softening temperature ranges 130 - 160°C. By means of NMR, IR and PC-MS spectral analyses, the structure of poly(1,5-cyclooctadiene), proposed earlier by Marvel et al., could be corroborated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890403
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  • 7
    Electronic Resource
    Electronic Resource
    Study on epoxy network solid electrolytes (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 2529-2536 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Blends of the diglycidyl ether of poly(ethylene glycol) (1)IUPAC name of 1: α-(2,3-epoxypropyl)-ω-(2,3-epoxypropoxy)poly(oxyethylene). and the triglycidyl ether of glycerol (2)IUPAC name of 2: 1,2,3-tris(2,3-epoxypropoxy)propane. were crosslinked in the presence of LiClO4 which seems to act as both a catalytic curing agent and as the source of the ionic charge carriers. The cured film showed a rather high ionic conductivity of about 10-5 S/cm at 25°C. The effect of composition, salt concentration and molecular weight of 1 on the conductivity and on the glass transition temperature Tg of the cured 1/2LiClO4 system was examined. The conductivity increased whereas Tg decreased with increasing 1/2 ratio. An increase of the molecular weight of 1 favoured the lowering of Tg and thus raised the conductivity. As to the effect of LiCIO4 concentration, the maximum conductivity occurred at about 5 wt.-% of LiClO4 and Tg increased with increasing LiClO4 content. The temperature dependence of the conductivity followed the Vogel-Tamman-Fulcher equation. This indicated that the ionic conductivity is effected by the cooperative segmental motion. All of the prepared specimens were found to be amorphous. They were mechanically strong films and showed rubber-elasticity at room temperature.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911102
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  • 8
    Electronic Resource
    Electronic Resource
    Conformation of phenyl rings in the helical chain polymer poly(triphenylmethyl methacrylate) (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1769-1775 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The conformation of phenyl rings in the side groups of the helical chain polymer poly(triphenylmethyl methacrylate) (1) in solution was studied by spectroscopic methods. According to the Raman spectrum the phenyl rings of 1 and triphenylmethyl methacrylate in solution have the same depolarization ratio at 1 002 cm-1. The electronic spectra (ultraviolet and fluorescence) of 1 are similar to those of model substances, except for the “red shift” of the spectra of about 5 nm. It was concluded that the phenyl rings can rotate around the phenyl—C bond.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920811
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  • 9
    Electronic Resource
    Electronic Resource
    Polymerization of 2,4-hexadiene with neodymium catalysts and characterization of the resulting polymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3617-3623 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polymerization of (E,E)-2,4-hexadiene with the Al(C2H5)2Cl/Nd(OCOR)3/Al(iBu)3 system was examined. High molecular weight crystalline polymers were obtained in polymerizations carried out at room temperature or below. IR and NMR examination showed the polymers to consist predominantly of trans-1,4 units. Degradative oxidation gave the racemic form of 2,3-dimethylsuccinic acid, thus indicating a threo structure for the polymers. X-ray analysis indicated that the polymers contain stereoregular sequences with a trans-1,4-threo-diisotactic structure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821223
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and propeller-propeller transition of optically active poly(diphenyl-o-tolylmethyl methacrylate) (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2681-2685 
    Details
    ISSN: 0887-624X
    Keywords: poly(diphenyl-o-tolylmethyl methacrylate) ; one-handed helical conformation ; propeller-propeller transition ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diphenyl-o-tolymethyl methacrylate (DPTMA) was synthesized and polymerized using initiators of organolithium complexes with (+)-(2S,3S)-dimethoxy-1,4-bis(dimethylamino) butane (DDB) and (-)-sparteine (Sp) as the chiral ligands. DDB was suitable for its complex effective to prepare optically active poly(diphenyl-o-tolylmethyl methacrylate) (PDPTMA) with one-handed helical conformation, whereas only low-molecular weight polymer was formed when Sp was used as ligand due to the repulsive hindrance between the triarylmethyl group and the ligand. A new mutarotation propeller-propeller transition, was observed for PDPTMA from the optical rotation curves and CD spectra in THF solution. The equivalent period of PDPTMA was estimated to be 14 Å based on the x-ray diffraction. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080311102
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