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  • 1
    Electronic Resource
    Electronic Resource
    X-ray and Solid State NMR Studies of Bis(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl) Disulfide and Diselenide (1994)
    s.l. : American Chemical Society
    Inorganic chemistry 33 (1994), S. 4688-4695 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00099a019
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  • 2
    Electronic Resource
    Electronic Resource
    Polymers containing formamidine groups (1993)
    Springer
    Polymer bulletin 31 (1993), S. 381-385 
    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 Aliphatic polyformamidines have been synthesized by reaction of aliphatic diamines with triethyl orthoformate in presence of catalytic amounts of acetic acid. The reaction has been carried out in DMSO at 180°C. The polymer structure has been confirmed by IR and NMR spectroscopy. For determination of molecular weights 1H NMR end group signals have been used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329872
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  • 3
    Electronic Resource
    Electronic Resource
    Polymers containing formamidine groups (1994)
    Springer
    Polymer bulletin 33 (1994), S. 397-404 
    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 Aromatic polyformamidines were synthesized by high temperature solution polycondensation of aromatic diamines with triethyl orthoformate. In order to obtain high molecular weight polymers, general investigations on the influence of reaction conditions such as reaction time, temperature and solvent were carried out on the basis of polyformamidine prepared from 4,4'-methylenedianiline. The proposed structures of aromatic polyformamidines were confirmed by elemental analysis, NMR-and IR-spectroscopy. Molecular weights were determined by 1H NMR end group analysis. Polyformamidines having inherent viscosities of 0.25–0.36 dl/g show excellent solubility in polar solvents and in strong acids. Thermal analysis indicated that these polymers are stable up to 300°C, and a 10% weight loss were recorded on the TG curves in the temperature range of 350–366°C in nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293482
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  • 4
    Electronic Resource
    Electronic Resource
    13C NMR analysis of poly[(m-phenylene terephthalate)-co-oxybenzoate]s: Main-chain and end-group resonance assignments and sequence distribution (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 2675-2684 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Samples of poly[(m-phenylene terephthalate)-co-oxybenzoate] with different compositions were analyzed by 13C NMR spectroscopy. Diad and triad signals could be identified and assigned. Furthermore, the signals of acetoxy, carboxy and hydroxy end-groups were assigned. The analysis of NMR substituent effects confirms the assignment. Comparison of the calculated statistical with the experimentally determined diad and triad contents shows a slight tendency for the formation of oxybenzoate blocks in the polymer chain.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911116
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  • 5
    Electronic Resource
    Electronic Resource
    Investigations on the dissociation behavior of hydrolyzed alternating copolymers of maleic anhydride and alkenes: 13C-NMR spectra and potentiometric titrations (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2415-2419 
    Details
    ISSN: 0887-624X
    Keywords: polyelectrolyte ; maleic acid copolymers ; pKa values ; 13C-NMR ; potentiometric titration ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pKa values of the succinic acid moieties of hydrolyzed alternating ethene- and isobutene-maleic anhydride copolymers were determined in D2O. The pD-dependence on the 13C chemical shift of selected signals was analyzed for these copolymers. Four different pKas were determined for the copolymer with ethene due to the existence of both the erythro- and threo-configuration of the succinic acid moiety: pK01,erythro = 4.2, pK0.1,threo = 4.1, pK02,erythro = 6.1, pK02,threo = 6.8. The isobutene-maleic anhydride copolymer contains only threo-units. Therefore, only two dissociation steps with pK01 = 3.0 and pK02 = 8.7 were observed for the hydrolyzed form. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    An approach to hyperbranched polymers with a degree of branching of 100%Dedicated to the memory of Prof. Dr. Reimund Stadler (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 2655-2664 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: General guidelines for the design of monomers for the synthesis of hyperbranched polymers without linear units are presented. The synthesis of one monomer fulfilling these requirements and the first results of the polymerization of this monomer are described. 4-(3-Maleimidopropoxy)-4′-methoxybenzaldehyde azine was used as a monomer of the AB2-type in a “criss-cross” cycloaddition with the maleimide group as A-function and the azine as two B-groups. Melt condensation of this monomer gave a polymer (Mn = 5700) which showed 1H and 13C NMR spectra corresponding well to the expected completely branched structure.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Fully aromatic copoly(ester-imide)s with high thermal stability (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 229 (1995), S. 159-174 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Vollaromatische Copoly(esterimid)e wurden aus den Imidmonomeren N-(3-Acetoxyphenyl)trimellitsäureimid und N-(2-Methyl-4-acetoxyphenyl)trimellitsäureimid mit 4-Acetoxybenzoesäure als Comonomerem in Schmelze und verschiedenen Monomerverhältnissen synthetisiert. Die Eigenschaften der Copoly(esterimid)e im Festkörper und das Schmelz- und Phasenverhalten unterscheiden sich stark. Sie weisen jedoch alle eine hohe Thermostabilität auf. Einige Polyester bilden in der Schmelze Mesophasen aus.Copoly(esterimid)e aus N-(3-Acetoxyphenyl)trimellitsäureimid und 4-Acetoxybenzoesäure bzw. einige Copolyester des ternären Systems sind für eine Verarbeitung aus der Schmelze geeignet.Die Copolyester aus N-(2-Methyl-4-acetoxyphenyl)trimellitsäureimid und 4-Acetoxybenzoesäure sind jedoch bei Temperaturen unterhalb des Zersetzungsbereiches (≤480°C) unschmelzbar.
    Notes: Fully aromatic copoly(ester-imide)s of various compositions were synthesized in bulk by conversion of N-(3-acetoxyphenyl)trimellitic acid imide and N-(2-methyl-4-acetoxyphenyl)trimellitic acid imide with 4-acetoxybenzoic acid as comonomer. The solid state properties, the melting and phase behaviour of the copoly(ester-imide)s differ largely, but all of them show high thermal stability. Some of the copoly(ester-imide)s form mesophases in the melt.Most of the investigated copoly(ester-imide)s of N-(3-acetoxyphenyl)trimellitic acid imide and 4-acetoxybenzoic acid and some of the ternary systems could be processed from the melt. Copoly(ester-imide)s of N-(2-methyl-4-acetoxyphenyl)trimellitic acid imide and 4-acetoxybenzoic acid, however, do not melt before rapid degradation at temperatures above 480°C.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052290111
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  • 8
    Electronic Resource
    Electronic Resource
    1H and 13C NMR signal assignment for the 4-phenyl 1,2,3,4-tetrahydro-1-naphthyl end-group of autopolymerized polystyrene (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 19 (1998), S. 83-88 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Most of the 1H and 13C NMR signals of the 4-phenyl-1,2,3,4-tetrahydro-1-naphthyl end-group of polystyrene are assigned. An oligostyrene synthesized by thermally initiated “living” free-radical polymerization of styrene in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) is used as a model compound. The TEMPO end-group is eliminated under formation of a benzophenone end-group prior to spectroscopical analysis. The tacticity of the backbone and probably the presence of the cis- and trans-stereoisomer result in a signal splitting of the end-group signals. The absence of a methyl end-group indicates that the starting radical is formed by H-abstraction from the Diels-Alder styrene dimer by TEMPO according to a mechanism proposed by Moad et al.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    The 1H and 13C NMR spectra of an alternating ethene/maleic anhydride copolymer and the corresponding acid and sodium salt (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 669-678 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The 1H and 13C NMR spectra of an alternating ethene/maleic anhydride copolymer and the corresponding acid and sodium salt were reinvestigated with regard to the signals depending on the configuration of the succinyl unit. From these assignments a 85/15 ratio of threo-and erythro- succinyl configurations was determined. Threo- and erythro-units are statistically distributed. Furthermore, signal splittings were observed due to microtacticity. Explanations are given for the signal fine structure. The polymer chain is atactic but a small degree of stereoregularity can be proved. T1 values and nuclear Overhauser effect (NOE) factors were determined; they correspond to investigations on other polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1995.021960222
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  • 10
    Electronic Resource
    Electronic Resource
    Grafting of maleic anhydride onto poly(tetrahydrofuran) (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 981-990 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A well-defined modification of poly(tetrahydrofuran)s was realized by grafting with maleic anhydride. The grafted products were investigated by Fourier-transform infrared (FTIR) spectroscopy and 13C nuclear magnetic resonance (NMR) spectroscopy. FTIR spectroscopy evidenced a characteristic shift of the carbonyl valence vibrations of cyclic anhydrides to higher wave numbers due to grafting. The grafting of maleic anhydride, which occurred mainly onto poly(tetrahydrofuran) carbons in α-position, was proved by means of 13C NMR spectroscopy. Furthermore, it was found that approximately 10% of all graftings took place onto poly(tetrahydrofuran) carbons in β-position. All the grafted units were monosubstituted succinic anhydride units. Indications for the formation of poly(maleic anhydride) graft units were not found. The quantitative determination of grafted anhydride units was carried out by titration after hydrolysis to the acid form. Remarkably high values of percentage grafting up to 20 wt.-% of maleic anhydride were obtained using an initiator concentration of only 2.5 mol-% related to maleic anhydride. The high values of percentage grafting at an initail maleic anhydride concentration of 20 wt.-% were due to a nearly complete conversion of the maleic anhydride. If the initial amount of maleic anhydride was higher than 20 wt.-% phase separation took place during the reaction. This phase separation prevented complete conversion of the maleic anhydride.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970318
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