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  • 1
    Electronic Resource
    Electronic Resource
    Head to head polymers. XXV:Part XXIV: M. Malanga and O. Vogl, J. Polym. Sci., Polym. Chem. Ed., in press. Properties of head to head polyisobutylene (1983)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 23 (1983), S. 597-600 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Head-to-head polyisobutylene, prepared by the Grignard coupling reaction of 2,2,3,3-tetramethyl-1,4-dibromobutane had molecular weight of 3,000 to 10,000 and was characterized by wide angle x-ray diffraction, optical microscopy and thermal behavior. Head-to-head polyisobutylene is crystalline, with a crystalline melting point of 187°C and a glass transition temperature of 87°C (measured by DSC at a scan rate of 20°/min.); these values compare to a glass transition temperature of head-to-tail polyisobutylene of similar molecular weight of -61°C and a crystalline melting point of 5°C, which can only be observed when the sample was stretched. The maximum rate of degradation of head-to-head polyisobutylene (20°/min. programmed temperature increase) is at 315°C, 70°C lower than that of head-to-tail polyisobutylene.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760231012
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of molecular weight and molecular weight distribution of polyester based soft segments on the physical properties of linear polyurethane elastomers (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 87 (1980), S. 1-33 
    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: Es wurden lineare Polyurethan-Elastomere in N,N-Dimethylacetamidlösung hergestellt, und zwar ausgehend von Diphenylmethan-4,4′-diisocyanat, 1,4-Butandiol und Polyestern von 2 unterschiedlichen Molekulargewichten und jedes mit einer Reihe von Molekulargewichtsverteilungen. Die Diolproben der verschiedenen Molekulargewichtsverteilungen wurden durch Mischen der Polyester mit unterschiedlichen Molekulargewichten hergestellt.Die Polyurethan-Elastomerfilme wurden aus Lösung gegossen und an Hand des Molekulargewichts- und Molekulargewichtsverteilungseinflusses auf die physikomechanischen und morphologischen Eigenschaften charakterisiert. Die meisten untersuchten Eigenschaften hingen stark vom Molekulargewicht der Polyester-Weichsegmente ab. Die Molekulargewichte beeinflußten in erster Linie das Relaxationsverhalten der Proben.Dynamisch-mechanische Messungen weisen darauf hin, daß in diesen Polymeren eine diffuse gemischte amorphe Phase vorliegt. Der Anteil dieser Phase hängt vom Molekulargewicht und der Molekulargewichtsverteilung ab. Die inhärenten Eigenschaften sind jedoch unabhängig von der Molekulargewichtsverteilung der Polyestersegmente.
    Notes: Linear polyurethane elastomers were synthesized in dimethyl acetamide (DMAc) solution, starting from 4,4′-methylene diisocyanate 1,4-butanediol, and polyester diols of two different molecular weights (MW) and each with a series of molecular weight distributions (MWD). Diol samples of various MWD's were prepared by blending polyesters of different MW. Polyurethane elastomer films were cast from solution, and characterized with the effect of the molecular weight and molecular weight distribution of the polyester diols on the physico-mechanical and morphological properties of the polyurethane elastomers investigated. Most properties studied depended strongly on the MW of polyester soft segments; the MWD influenced primarily the relaxation behaviour of the polyurethane samples. Our data indicates that these phenomena are related to variations of the amounts of high MW polyester diols. The dynamic-mechanical measurements and the polymer morphology studies indicate that a diffuse, mixed amorphous phase exists in these polymers; the amount of the phase depends on MW and MWD of the polyester segment, but the intrinsic properties are essentially independent of the MWD of the polyester segment.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050870101
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  • 3
    Electronic Resource
    Electronic Resource
    Functional polymers, 5.Part 4: D. Tirrell, D. Bailey, C. Pinazzi, O. Vogl, Macromolecules 11, 313 (1978). Preparation and polymerization of methyl 4-vinylsalicylate, 4-vinylsalicylic acid and 4-vinylacetylsalicylic acid (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2097-2109 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methyl 4-vinylsalicylate, 4-vinylsalicylic acid, and 4-vinylacetylsalicylic acid were prepared in overall yields of 28%, 21% and 16%, respectively, starting with 3-ethylphenol. Radical polymerization of all three monomers was investigated. Methyl 4-vinylsalicylate and 4-vinylsalicylic acid polymerized normally via radical initiation, giving soluble polymers of high molecular weight. 4-Vinylacetylsalicylic acid gave gelled polymerization mixtures in tert-butanol and in dimethyl sulfoxide, using the same experimental procedure; this was shown to be a result of intermolecular transesterification during polymerization. A water-insoluble copper complex of poly(4-vinylsalicylic acid) was prepared. Methyl 4-vinylacetylsalicylate was also synthesized, in 35% yield, but no polymerization experiments were performed with this monomer. These new polymeric salicylic acid derivatives are of interest as ultraviolet stabilizers, as protective agents for the skin, as metal-complexing agents, and as potential medicinal agents.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811008
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  • 4
    Electronic Resource
    Electronic Resource
    Functional polymers, 11Part 10: W. Deits, E. Westhead, O. Vogl, J. Macromol. Sci., Chem. 16, 691 (1981). Synthesis and polymerization of 2-(2-hydroxy-5-vinylphenyl)-2 H-benzotriazoleDedicated to Prof. Dr. Georg Manecke on the occasion of his 65th birthday, with warmest personal wishes (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 259-279 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2-(2-Hydroxy-5-vinylphenyl)-2H-benzotriazole (9) was prepared by a seven step synthesis in about a 25% overall yield starting from o-nitroaniline. Diazotization in aqueous HCl gave a diazonium salt which was coupled with p-ethylphenol to an azo-dye which was reduced with zinc powder in sodium hydroxide solution to 2-(2-hydroxy-5-ethylphenyl)-2H-benzotriazole (4). This compound was acetylated and then brominated with N-bromosuccinimide to 2-[2-acetoxy-5-(1-bromoethyl)phenyl]-2H-benzotriazole (6) which was dehydrobrominated with triethylamine in acetonitrile or tributylamine in dimethylacetamide to the vinyl compound which was hydrolyzed to 9. This monomer was readily homopolymerized and copolymerized with styrene and methyl methacrylate using 2,2′-azobis(2-methylpropionitrile) as initiator.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830201
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic determination of stereoselectivity in the anionic polymerization of α-ethyl-α-phenyl-β-propiolactone (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 811-819 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of the anionic polymerization of optically active α-ethyl-α-phenyl-β-propiolactone (optical purity 16,8%) initiated with bis(triphenylphosphine)iminium acetate was investigated and the rate constants for the homo-(kph) and crosspropagation (kpc) (considering R and S enantiomers as comonomers) were determined. The knowledge of the values of kph and kpc, equal to 1,53·10-4 and 9,0·10-51· mol-1·s-1, respectively (25°C, CH2Cl2 solvent), allowed us to calculate the distribution of homosequences in the polymer prepared from racemic monomer. The concentration of homosequences was slightly higher than calculated for the process with random enchainment of enantiomers. Thus, the content of homodyads, homotriads, and homotetrads equals 63, 40, and 25%, whereas for the random process it was 50, 25, and 13%, respectively. This difference is, however, too small to create homoblocks which could be responsible for the observed crystallinity of these polymers.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840415
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  • 6
    Electronic Resource
    Electronic Resource
    Haloaldehyde polymers, 15.Part 14: L. S. Corley, O. Vogl, J. Macromol. Sci., Chem. 14, 1105 (1980). Stabilization of polychloral by posttreatment (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2111-2126 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polychloral prepared by anionic polymerization has primarily alkoxide endgroups as the living terminal ends. The initial endgroups depend on the type of nucleophile used for the initiation. Alkoxide-terminated polychloral degrades to monomer on heating to slightly above 100°C or on extraction with methanol or acetone. Programmed DTG shows a degradation rate maximum (MDT) near 150°C. Terminations of the polymer endgroups were observed when the polymer was allowed to stand for long periods of time before workup. The type and amount of stabilization depends on the cation and residual monomer. With HCI the alkoxide ends can be protonated to give hydroxyl terminated polychloral, which is stable to extraction and has an MDT of 220°C. Acylation or alkylation as posttreatments could not be shown to produce the expected acyl- or alkyl endcapped polychloral, but posttreatment with acetyl chloride produced partially stable polymer (one MDT higher than 300°C) without detectable acetyl endgroups. The most effective posttreatment is with PCl5/CCl4 which gives highly stabilized polychloral with an MDT near 350°C. The treatment was only effective in thin sections of polymer and appeared to have introduced a chlorine endgroup.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811009
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  • 7
    Electronic Resource
    Electronic Resource
    Functional polymers, 32Part 31: cf. S. J. Li and O. Vogl, Polym. Bull., in press.. 5-Methoxy- and 5-hydroxy-2H-benzotriazol-2-yl mono- or disubstituted resorcinols or phloroglucinolsThis paper is dedicated to Prof. Dr. J. Schurz on the occasion of his 60th birthday with best personal wishes (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 2497-2509 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Four new 5-methoxy-2H-benzotriazol-2-yl mono- or di-substituted resorcinols and phloroglucinols 5a, b and 6a, b were synthesized by reaction of resorcinol or phloroglucinol with 4-methoxy-2-nitrobenzenediazonium chloride in a 1:1 or 1:2 mole ratio and subsequent reductive cyclization with zinc and sodium hydroxide. The methoxy groups of all four compounds were cleaved with dry hydrogen bromide gas in dimethylformamide leading to the corresponding hydroxyl derivatives 7a, b and 8a, b in nearly quantitative yields. Unlike the reaction of phloroglucinol with a large excess of 2-nitrobenzenediazonium chloride, which gave the trisubstituted product, with 4-methoxy-2-nitrobenzenediazonium chloride no phloroglucinol derivative with three 5-methoxy-2H-benzotriazol-2-yl groups could be obtained. All the resulting products were characterized by their IR, 1H, and 13C NMR, and UV spectra. The resorcinol derivatives (both methoxy- and hydroxy-) Showed λmax of 345 nm and an absorption coefficients as high as 4 · 104 l · mol-1 · cm-1, and the phloroglucinol derivatives a λmax of 350 nm and an absorption coefficient as high as 4,5 · 104 l · mol-1 · cm-1.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021851202
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  • 8
    Electronic Resource
    Electronic Resource
    Magic-angle 13C NMR spectroscopy of chloral polymersDedicated with best personal regards to Prof. Cantow on the occasion of his 60th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1243-1246 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The homopolymer of chloral and a copolymer of chloral and p-chlorophenyl isocyanate were studied by magic-angle 13C NMR spectroscopy. 13C NMR Measurements with magic-angle spinning and cross polarization show for the acetal carbon a chemical shift of 101, 4 p.p.m. downfield from tetramethylsilane. The observation of a symmetrical, reasonably sharp (3 p.p.m.) resonance suggests that the polychloral is stereoregular. Spectra of chloral copolymers with 5 moles percent p-chlorophenyl is steroregular. Spectrical of chloral copolymers with 5 moles percent p-chlorophenyl isocynate have additional peaks between 130 and 150 p.p.m. from the aromatic carbons of the p-chlorophenyl isocyanate moiety.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840613
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  • 9
    Electronic Resource
    Electronic Resource
    Developments in polymerization-3, R. N. Haward, ed., Applied Science Publishers, London, 1982,243 pp. Price: $58.00 (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 21 (1983), S. 308-309 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.130210418
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  • 10
    Electronic Resource
    Electronic Resource
    Optically active zwitterions (1980)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 1 (1980), S. 715-718 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1980.030011203
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