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  • 1
    Digitale Medien
    Digitale Medien
    Ring-opening polymerization of trimethyl cyclopropane-1,2,3-tricarboxylate (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2559-2563 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1978.021791022
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  • 2
    Digitale Medien
    Digitale Medien
    Synthesis of a polydithiocarbonate from carbon disulfide, alkali metal diolate and α,ω-dihalo compound (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 979-984 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Poly[thio(thiocarbonyl)oxy-1,4-cyclohexyleneoxy(thiocarbonyl)thiomethylene-1,4-phenylenemethylene] (4) was obtained from 4-bromomethylbenzyl bromide (1), dipotassium 1,4-cyclohexanediolate (2) and carbon disulfide at low temperature by using 1,4,7,10,13,16-hexaoxacyclooctadecane as catalyst. At high temperatures, poly[oxy-1,4- cyclohexyleneoxymethylene-1,4-phenylenemethylene] (8) was obtained from the reaction between 1 and 2, however. Mechanisms are proposed for these reactions.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1980.021810501
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  • 3
    Digitale Medien
    Digitale Medien
    Stereochemistry in “living” coordination polymerization of propene initiated by vanadium-based catalytic systems (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1827-1833 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Soluble catalysts of V(acac)3 and AIR2X (R = C2H5, n-C3H7, i-C4H9; X = Cl, Br) initiate a living polymerization of propene at -78°C to afford monodisperse polymers of syndiotactic structure. The stereochemistry of the living polymerization was investigated by examining the structures of monomdisperse polypropylenes and of propylene-ethylene block copolymers by means of 13C NMR spectroscopy. It was found that syndiotactic- and regio-specificities of the soluble vanadium-based catalysts are not influenced by the sequence length of the living polymer chain.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021850905
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of monomer diffusion in the polymerization of olefins over Ziegler-Natta catalysts (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 995-1006 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: By using an extremely high stereospecific catalyst, three kinds of copolymerizations were carried out with combinations of monomers which differ in the crystallinity of the homopolymers. Addition of a small quantity of comonomer to the homopolymerization systems producing very high crystalline polymers was found to cause a remarkable increase in the apparent polymerization rate as well as a marked decrease in the polymer crystallinity. Such an irregular increase in the polymerization activity was, however, not observed when a small amount of comonomer was added to the homopolymerization systems producing low-crystalline or amorphous polymers. These observations have led to the conclusion that resistance of monomer diffusion through the polymer film should be one of the significant parameters for the apparent polymerization rate when very high crystalline polymers, like high density polyethylene, isotactic polypropylene etc., are produced.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1989.021900508
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  • 5
    Digitale Medien
    Digitale Medien
    Synthesis and structure of a “living” copolymer of propylene and 1,5-hexadiene (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 643-651 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A soluble V(acac)3/Al(C2H5)2Cl system was found to polymerize 1,5-hexadiene to give a living polymer in toluene at -78°C. Hydrogenation of poly(1,5-hexadiene) was conducted to determine the chain microstructure. The 13C NMR analysis of hydrogenated poly(1,5-hexadiene) indicated that the poly(1,5-hexadiene) is composed of alternating units of 1,3-cyclopentylenemethylene and 1-vinyltetramethylene. In addition, living copolymers of propylene and 1,5-hexadiene were prepared and characterized by analysis of the 1H and 13C NMR spectra. A chain propagation mechanism of living poly(1,5-hexadiene) is proposed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1989.021900320
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  • 6
    Digitale Medien
    Digitale Medien
    Effect of hydrogen on propene polymerization with solvay-type TiCl3/Cp2 TiMe2 catalyst (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 3137-3142 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Polymerization of propene with a highly isospecific Solvay-type TiCl3/Cp2TiMe2 catalyst in the presence and absence of hydrogen was investigated. It was found that hydrogen exerts almost no effect on the molecular weight and the stereoregularity of the resulting polypropylene. Furthermore, the H2/D2 exchange reaction hardly proceeds over the catalyst. To discuss this unusual behavior, plausible mechanistic explanations on the basis of the structure of active species are proposed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1989.021901211
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  • 7
    Digitale Medien
    Digitale Medien
    Effect of catalyst isospecificity on olefin copolymerization (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 2853-2864 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Copolymerizations of ethylene with propene, ethylene with 1-hexene, and propene with 1-hexene were performed at 40°C under atmospheric pressure by using the aspecific catalyst composed of TiCl3/MgCl2 and Al(C2H5)3 and the isospecific Solvay-type catalyst composed of TiCl3 and Cp2Ti(CH3)2. In case of ethylene-propene copolymerization, the catalyst isospecificity affects neither the monomer reactivity ratios nor the monomer distribution in poly(ethylene-co-propene). The thermal properties of poly(ethylene-co-propene) are, however, not the same for the two catalysts due to the different tacticity of long propylene sequences contained in the copolymers. In the copolymerizations of ethylene and 1-hexene and of propene and 1-hexene, the monomer reactivity ratios differ to some extent between the two catalyst systems. The aspecific catalyst facilitates incorporation of 1-hexene both in poly(ethylene-co-1-hexene) and poly(propene-co-1-hexene). The monomer distributions are also different in these copolymers. The aspecific and isospecific catalysts show a tendency to give random and blocky copolymers, respectively.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1990.021911201
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  • 8
    Digitale Medien
    Digitale Medien
    Polymerization of olefins with the catalyst system (RCp)TiCl3 (R = H, CH3)/SiO2-common alkylaluminium activated with a suitable Lewis acid (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 1687-1694 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The silica-supported catalyst (RCp)TiCl3 (R = H, CH3; Cp = cyclopentadienyl) was prepared by reaction of (RCp)TiCl3 with silica gel. The resulting catalyst combined with common alkylaluminium as cocatalyst does not show any activity for olefin polymerization. However, the catalyst system is easily activated by adding a strong Lewis acid like (C6H5)3C·B(C6F5)4. Polymerization of propene and ethylene-propene copolymerization with this catalyst system gives atactic polypropene with frequent chemical inversion and a random copolymer whose structure is very similar to that produced with a homogeneous vanadium catalyst system, respectively.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021930712
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  • 9
    Digitale Medien
    Digitale Medien
    Copolymerization of olefins with Kaminsky-Sinn-type catalysts (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 823-831 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Copolymerizations of ethylene with propene, ethylene with 1-hexene and propene with 1-hexene were performed at 40°C under atmospheric using three kinds of Kaminsky-Sinn-type catalysts which differ in stereospecificity: Cp2ZrCl2-methylaluminoxane (MAO) (aspecific); Et[IndH4]2 ZrCl2-MAO (isopecific); i-Pr(Cp)(Flu)ZrCl2-MAO (syndiospecific).The 13C NMR analysis of copolymers showed that the incorporation of higher olefins decreases in the following order: i -Pr(Cp)(Flu)ZrCl2-MAO 〉 Et[IndH4]2ZrCl2-MAO 〉 Cp2ZrCl2-MAO, and that stereospecificity is retained even in the copolymerization.The product of monomer reactivity ratios (r1 · r2) indicates that poly(propene-co-1-hexene) is a statistically random copolymer whereas both poly(ethylene-co-propene) and poly(ethylene-co-1-hexene) have somewhat alternating character regardless of catalyst stereospecificity.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021930401
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  • 10
    Digitale Medien
    Digitale Medien
    Copolymerization of carbon dioxide and propylene oxide with new catalysts (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 893-897 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1977.021780325
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