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  • polydimethylsiloxane  (2)
  • Char yield  (1)
  • Inertial confinement fusion  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of polymer research 1 (1994), S. 353-359 
    ISSN: 1572-8935
    Keywords: Polyurethane ; Phenylbis(hydroxyalkyl)phosphonate ; Thermal stability ; Char yield
    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: Abstract Phenylbis(hydroxyalkyl)phosphonates were prepared by treating excess glycol(ethylene glycol or diethylene glycol) with phenylphosphonic dichloride (PPD). Phosphorus-containing homopolyurethanes were synthesized by low temperature solution polyaddition by phenylbis (hydroxyalkyl)phosphonates with tolylene diisocyanate (TDI). Copolyurethanes with various phosphorus content were prepared by copolymerization of tolylene diisocyanate with polypropylene glycol (PPG, MW = 3000), and phenylbis(hydroxyalkyl)phosphonate. All polymers were characterized by elemental analysis, infrared (IR), differential scanning calorimeter (DSC), differential thermal analysis (DTA), and thermogravimetric analysis (TGA). Thermal properties of the polyurethane were compared with that of the common polyurethane. Phosphorus containing homopolyurethanes and copolyurethanes had lower decomposition temperatures and higher char yield residue than the corresponding common polyurethane.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 13 (1994), S. 45-58 
    ISSN: 1572-9591
    Keywords: Inertial confinement fusion ; spherical pinch ; shock wave ; implosion and explosion ; hightemperature hydrodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The spherical pinch concept is an outgrowth of the inertial confinement model. The salient feature of the spherical pinch concept is the creation of a hot plasma in the center of a sphere.(1,2) This plasma is then compressed by a strong shock wave launched from the periphery of the vessel by an imploded plasma acting as a driver. This scheme, reveals that convergence of the shock, which is the main feature of all inertial confinement schemes, is a component of the spherical pinch model. The reasons for classifying the spherical pinch as a particular ICF model and designating it as a ICF-SP are given here. The fluid mechanics and high-temperature hydrodynamics of the spherical pinch can be briefly described as an explosion within an implosion. The structure of the shock wave for such explosion within an implosion and for, an implosion alone is determined by solving numerically the governing equations of the phenomena. We present here a detailed computational comparison of the inertial confinement model and the spherical pinch in terms of density, pressure, temperature, confinement time, total accumulated number of neutrons, and time-resolved neutron flux from reactions in deuterium-tritium mixture. It is shown that temperature, confinement time, and total number of neutrons for the ICF-Spherical Pinch improve upon the classical ICF.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3313-3318 
    ISSN: 0887-624X
    Keywords: polydimethylsiloxane ; photoinitiator ; methyl methacrylate ; rate constants ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the free radical photopolymerization of methyl methacrylate (MMA) initiated by azo-containing polydimethylsiloxane (PSMAI) and azobisisobutyronitrile (AIBN) was investigated. The greater polymerization rate Rp in MMA/PSMAI systems may be due to the higher value of the initiation rate Ri and the lower value of the termination rate constant kt than that in MMA/AIBN system. The reaction orders with respect to initiators PSMAI decreased with an increase in polydimethylsiloxane chain length (SCL) in PSMAI. The observed deviations in polymerization rate from rate equation could be explained in terms of primary radical termination. The photoinitiator efficiency Φ of initiators decreased with increase in SCL, while the ratio of the rate constants for chain termination and chain initiation by primary radical increased with SCL. The fraction β of primary radicals entering into termination in MMA/PSMAI systems were larger than that in MMA/AIBN system. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2613-2620 
    ISSN: 0887-624X
    Keywords: polydimethylsiloxane ; poly(methyl methacrylate) ; block copolymer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Azo group-containing polydimethylsiloxanes (PDMS-ACP), macroazoinitiators, were prepared by polycondensation reaction of 4,4′-azobis-4-cyanopentanoyl chloride (ACPC) with hydroxybutyl-terminated polydimethylsiloxane (PDMS) of varying molecular weights. The activation energy (Ea), activation enthalpy (ΔH
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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