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  • Articles  (29)
  • Articles: DFG German National Licenses  (29)
  • Polymer and Materials Science  (29)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 1129-1134 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The copolymerization of propylene with 1-butene was carried out in presence of the catalytic system TiCl4/Mg[(CH2)5CH3]2 in heptane. A transparent copolymer with a random distribution (r1 · r2 = 1,0) was obtained. The catalyst shows a considerably high activity. The rate of monomer addition was found to be independent of the chemical structure of the growing polymer chain end, which is quite different for the copolymerization of ethylene with propylene.
    Additional Material: 3 Ill.
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N - Nitrophenylchitosan derivatives were prepared by the reaction of chitosan hydrochloride with 1 - fluoro - 4-nitrobenzene, 1-fluoro-2,4-dinitrobenzene and p-nitrobenzaldehyde. The 2,4-dinitrophenyl derivative, which is the only product soluble in dimethyl sulfoxide and dimethylformamide, was analyzed by two-dimensional NMR spectroscopy. Its solution in dimethylformamide exhibits a remarkable change in color from yellow to red upon electroreduction, and the film cast from dimethylformamide solution shows similar electrochromic properties.
    Additional Material: 5 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 3629-3640 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: Glow discharge polymerizations of tetramethylsilane (TMS) were performed by the capacitive coupling of a 20 kHz frequency in comparison with those by the inductive coupling of a 13.56 MHz frequency. The polymers prepared by the former coupling were poorer in carbon and hydrogen, but richer in silicon than those prepared by the latter coupling. These two polymers showing similar infrared spectra contained CH3, CH2, CH, Si—O—C, Si—O—Si, Si—CH3, and Si—CH2—CH2—Si groups. Some physical properties involving surface energy, thermal stability, and absorption spectra in the regions of the UV and visible light were determined. This coating procedure was applied for surface hardening of a polyethylene sheet. The surface hardness of the polyethylene sheet was enhanced by a coating of plasma films prepared from TMS or the TMS/O2 mixtures. Surface hardness was determined by the pencil method and hardness was enhanced from 2B to 2H. The adhesion between these plasma films and polyethylene sheet was good even when immersed in 0.9% NaCl solution at 40°C for 10 days.
    Additional Material: 7 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. S1 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 2023-2028 
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(methyl methacrylate) microspheres [poly(SerMA-co-MMA), poly(AlaMAm-co-MMA), poly(AlaEMA-co-MMA), and poly(AlaMAm/AlaEMA-co-MMA)] modified with O-methacryloyl-L-serine (SerMA), N-methacryloyl-L-alanine (AlaMAm) and L-alanine 2-methacryloyloxyethyl ester (AlaEMA) were prepared by the emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) with SerMA, AlaMAm and AlaEMA, respectively, initiated with 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (ABIP). The series of polymer microspheres showed unimodal distribution of the particle size (290-800 nm) in water. From X-ray photoelectron spectroscopy it was concluded that the amino acid moieties are located on the surface of the particles in all cases. Poly(SerMA-co-MMA) showed the most effective suppression of adsorption of proteins such as albumin (Alb), γ-globulin (Glo) and fibrinogen (Fib) among the examined poly(methylmethacrylate) microspheres.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1223-1242 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton magnetic resonance studies at 220 MHz were carried out on synthetic polymers of the repeating tetrapeptide of elastin. Temperature dependence and solvent-mixture dependence of peptide proton chemical shifts were determined for both linear polymers, N-formyl-(Val-Pro-Gly1-Gly2)n-Val OMe where n ≃ 8 and 40, and for cyclic polymers (Val-Pro-Gly1-Gly2)n, where n = 3 and 4. The Gly2 NH was found to be solvent shielded. In addition, by studying the polymers Boc-Val-Pro-Gly1-Gly2-OH, H-Pro-Gly1-Gly2-Val OMe, H(Pro-Gly1-Gly2-Val)3OH, and others, it was demonstrated that the Val C-O immediately preceding the Gly2 NH in the sequence was required for solvent shielding. Also the Gly2 NH resonance is found at higher field than the Gly1 NH resonance. This provides the basis for proposing a β turn in which the Pro and Gly1 residues form the corners, i.e., residues i + 1 and i + 2, and in which the Gly2 NH, residue i + 3 hydrogen bonds to the carbonyl of residue i, the Val residue.Studies on methanol-water solvent systems indicated retention of the β turn as a significant conformational feature. This suggests that the β turn occurs in the elastic fiber, which contains about 60% water but which utilizes association of hydrophobic groups as a primary force in fibrogenesis.
    Additional Material: 5 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 2951-2953 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 8
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The short-period polymerization method was successfully applied to the synthesis of a novel diblock copolymer, polypropene-block-poly(ethylene-co-propene). The polymerization was carried out for ca. 0,1 s with a MgCl2-supported Ziegler catalyst. The copolymers obtained showed unimodal curves in gel-permeation chromatography without any peak in the low-molecular-weight region. After extraction with heptane, the fraction of poly(ethylene-co-propene) remained unchanged in the copolymer but disappeared in a commercial so-called block-type copolymer. All the results the formation of polypropene-block-poly(ethylene-co-propene), in which poly(ethylene-co-propene) is chemically linked with polypropene.
    Additional Material: 4 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 25-29 
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A modified-polypropene-supported Ziegler catalyst was prepared using polypropene containing a small amount of poly(7-methyl-1,6-octadiene) as a starting polymer for bromination, lithiation, and reaction with TiCl4. The polymerization of ethene was carried out using the catalyst with Al(C2H5)3 in toluene at 60°C up to 100 h. The polymer yield increased linearly with polymerization time, which indicates that the active sites of the modified-polypropene-supported Ziegler catalyst are practically stable without deactivation even for 100 h and are able to propagate further polymerization of ethene.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 393-399 
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular weight and molecular weight distribution of polyethene prepared with a modified-polypropene-supported Ziegler catalyst were investigated in terms of the variation of the polymerization conditions, such as the kind of co-catalyst, its concentration, and polymerization temperature. Ethene polymerization with the catalyst in the presence of triethylaluminium proceeded in heterogeneous system to give a polyethene with extremely broad molecular weight distribution. The result was completely changed upon replacing the triethylaluminium by other alkylaluminium compounds, such as diethylaluminium chloride. Polyethenes with very broad, narrow, bimodal, and multimodal molecular weight distributions were obtained by simply varying the co-catalyst. The molecular weight distributions of polyethenes obtained were also very sensitive to co-catalyst concentration and polymerization temperature. From the results obtained, it is suggested that the modified-polypropene-supported Ziegler catalyst is feasible as a novel candidate for a catalyst system giving polyethenes with controlled molecular weight distributions in a wide range of molecular weight.
    Additional Material: 10 Ill.
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