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  • Polymer and Materials Science  (9)
  • Char yield  (1)
  • Computational Chemistry and Molecular Modeling  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Synthesis and characterization of phosphorus-containing polyurethanes (1994)
    Springer
    Journal of polymer research 1 (1994), S. 353-359 
    Details
    ISSN: 1572-8935
    Schlagwort(e): Polyurethane ; Phenylbis(hydroxyalkyl)phosphonate ; Thermal stability ; Char yield
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01378768
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  • 2
    Digitale Medien
    Digitale Medien
    The effects of aromatic solvents on the photopolymerization rates of isoprene, ethyl methacrylate, and styrene (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 1539-1547 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The photochemical polymerization rates of isoprene, ethyl methacrylate, and of styrene in various aromatic solvents were measured. The average lifetimes of propagating radicals were measured by the rotating sector method. The polymerization rate constants, Kp, were determined and compared with dipole moments (μ) and Hammett σ constants for the aromatic solvents. Linear correlations of log(kp/kp, benzene) vs. μ and σ were obtained.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1990.080280620
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization and degradation of the poly(methylphenylsiloxane)-poly(methyl methacrylate) graft copolymer (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2521-2530 
    Details
    ISSN: 0887-624X
    Schlagwort(e): poly(methylphenylsiloxane) ; poly(methyl methacrylate) ; graft copolymer ; spin-spin relaxation ; degradation ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Poly(methylphenylsiloxane)-poly(methyl methacrylate) graft copolymers (PSXE-g-PMMA) were prepared by condensation reaction of poly(methylphenylsiloxane)-containing epoxy resin (PSXE) with carboxyl-terminated poly(methyl methacrylate) (PMMA), and they were characterized by gel permeation chromatography (GPC), infrared (IR), and 29Si and 13C nuclear magnetic resonance (NMR). The microstructure of the PSXE-g-PMMA graft copolymer was investigated by proton spin-spin relaxation T2 measurements. The thermal stability and apparent activation energy for thermal degradation of these copolymers were studied by thermogravimetry and compared with unmodified PMMA. The incorporation of poly(methylphenylsiloxane) segments in graft copolymers improved thermal stability of PMMA and enhanced the activation energy for thermal degradation of PMMA. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2521-2530, 1998
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Photopolymerization of styrene, p-chlorostyrene, methyl methacrylate, and butyl methacrylate with polymethylphenylsilane as photoinitiator (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 679-685 
    Details
    ISSN: 0887-624X
    Schlagwort(e): polymethylphenylsilane ; polymeric photoinitiator ; rate constants ; monomer dipole moment ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The rates of photochemical polymerization of styrene (St), p-chlorostyrene (Cl-St), methyl methacrylate (MMA), and butyl methacrylate (BMA) with polymethylphenylsilane (PMPS) as an initiator were measured. Polymethylphenylsilane is photodegrated to form silyl radicals that may initiate polymerization of vinyl monomers. Rate constants kp and kt have been determined for these systems. A good correlation (log P = α + βμ) of the resonance stabilization (P) of the chain radicals and the dipole moment (μ) of the monomers is observed for these polymerization systems. This equation may be used to estimate the resonance stabilization (P) of a monomer and the polymerization rate constant (kp). © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Thermal degradation of aged polytetrahydrofuran and its copolymers with 3-azidomethyl-3′-methyloxetane and 3-nitratomethyl-3′-methyloxetane by thermogravimetry (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3337-3343 
    Details
    ISSN: 0887-624X
    Schlagwort(e): aged energetic copolymer ; thermal stability ; activation energy ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The thermal decomposition behavior of the aged tetrahydrofuran copolymers with 3-azidomethyl-3′-methyloxetane (AMMO) or 3-nitratomethyl-3′-methyloxetane (NMMO) were studied by thermogravimetry and evolved gas analysis, and compared with aged polytetrahydrofuran (poly-THF) The thermal stability decreased in the order poly-THF 〉 poly-AMMO-THF-AMMO 〉 poly-NMMO-THF-NMMO, whereas the range of temperature for decomposition increased in the order poly-THF 〈 poly-AMMO-THF-AMMO 〈 poly-NMMO-THF-NMMO. The apparent activation energies of the degradation for polymers with ageing, calculated by the Ozawa method, were smaller than that without ageing. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Photopolymerization of methyl methacrylate with azo-containing polydimethylsiloxane as photoinitiator: Effect of siloxane chain length (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3313-3318 
    Details
    ISSN: 0887-624X
    Schlagwort(e): polydimethylsiloxane ; photoinitiator ; methyl methacrylate ; rate constants ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Characterization of azo-containing polydimethylsiloxanes and their copolymers with methyl methacrylate (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2613-2620 
    Details
    ISSN: 0887-624X
    Schlagwort(e): polydimethylsiloxane ; poly(methyl methacrylate) ; block copolymer ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Vinyl monomer irradiation-grafted nylon 4 membranes (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4709-4718 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: To improve the performance of Nylon 4 membranes, this study attempts to utilize 60Co γ-ray irradiation which induces vinyl monomers to be grafted onto Nylon 4 membranes for desalination purposes. Sodium styrene sulfonate, acrylamide, vinylacetate, and styrene are the grafting monomers. The transport properties and mechanical strength of the γ-ray irradiation-grafted Nylon 4 membranes are studied. Both the water flux and salt rejection of sodium styrene sulfonate-grafted membranes increase significantly, compared to Huang's results. The other grafted membranes also show increased salt rejection.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1986.070320435
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  • 9
    Digitale Medien
    Digitale Medien
    Orbital relaxation in the Rydberg series of the He atom (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 6 (1985), S. 282-286 
    Details
    ISSN: 0192-8651
    Schlagwort(e): Computational Chemistry and Molecular Modeling ; Biochemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Informatik
    Notizen: The orbital behavior of both the singlet and triplet Rydberg series for 1sns configurations of the He atom has been investigated using one- and two-configuration Hartree-Fock wave functions. The core orbital within the triplet series changes negligibly; however, a contract trend is noticeable as the Rydberg orbital penetrates more into the core region, which is in contrast to that found in the 1s2ns 2S Rydberg series of Li atom. Although some properties of the whole atom can be calculated, the core relaxation of the singlet series can not be drawn without ambiguity because a two-configuration correlated wave function has to be used, and thus the orbital picture is lost.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcc.540060404
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  • 10
    Digitale Medien
    Digitale Medien
    Stationary Phase 5. Evaluation of Stationary Phases for HPLC of ExplosivesPresented at the International Symposium on Chromatography, Tamsui, April 1986. (1987)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 12 (1987), S. 26-28 
    Details
    ISSN: 0721-3115
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The retentions of 11 explosives on two commercially RP-18 and Si 100 stationary phases and one prepared 3-[9′-(10′-methylanthryl)]- propylsilane stationary phase (MAPS-phase) were examined by modified mobile phases. The evaluation of these three stationary phases results as follows: (1)Most explosives were effectively separated on a column of MAPS-phase not only with methanol/water (75/25-85/15) as mobile phase but also with n-hexane/dichloromethane (75/25) as mobile phase.(2)Few explosives were effectively separated on a column of RP-18 with methanol/water (75/25-85/15) as mobile phase.(3)The separation of most explosives on Si 100 was achieved only under normal phase condition such as n-hexane/dichloromethane (75/25) as mobile phase.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prep.19870120106
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