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  • Polymer and Materials Science  (249)
  • Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry  (5)
  • Wiley-Blackwell  (254)
  • American Institute of Physics (AIP)
  • Cambridge University Press
  • 1985-1989  (254)
  • 1989  (254)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (254)
  • American Institute of Physics (AIP)
  • Cambridge University Press
Years
  • 1985-1989  (254)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Two-dimensional proton NMR studies on poly(VPGVG) and its cyclic conformational correlate, cyclo(VPGVG)3 (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 819-833 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two-dimensional nuclear Overhauser enhancement (2D NOESY) data are reported for the polypentapeptide of elastin, poly(VPGVG), and the cyclopentadecapeptide, cyclo(VPGVG)3. In both, the repeating type II Pro2-Gly3 β-turn can be derived from the NOE data, providing confirmation of many previous studies. In addition, other through-space connectivities are detailed that also compare favorably with previously determined crystal and solution structures for cyclo(VPGVG)3. Also, near identical data for the cyclopentadecapeptide and the polypentapeptide demonstrate the cyclic conformation-linear (helical) conformational correlate relationship between the two molecules. The 2D NOESY experiment is seen to be an effective means of establishing the presence or absence of a conformational relationship between a cyclic repeating sequence and its higher molecular weight linear counterpart. This is an approach of substantial practical value when developing the conformation of sequential polypeptides and when attempting to identify the presence of the conformation of a repeating peptide sequence within a more complex primary structure.Having established the basic conformational relationship between a cyclic conformation and its linear helical counterpart, cross peaks present in the linear helical structure that are not present in the cyclic conformational correlate can provide information on the interactions between adjacent turns of the helix. In this connection, a ValγCH3 ↔ ProβCH2 interaction is reported that can be the basis for determining the number of pentamers per turn of helix once it is determined whether it is dominantly the Val1 or Val4γCH3 that is interacting with the Pro2βCH2.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280404
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  • 2
    Electronic Resource
    Electronic Resource
    Low temperature deposition of a CaF2 insulator layer on GaAs (1989)
    Weinheim : Wiley-Blackwell
    Advanced Materials 1 (1989), S. 399-400 
    Details
    ISSN: 0935-9648
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19890011109
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  • 3
    Electronic Resource
    Electronic Resource
    Test methodology for the determination of optimum fusion welding conditions of polyethylene (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 147-162 
    Details
    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: The fusion welding behavior of a medium density polyethylene resin has been studied for a wide range of heating rates using a recently developed test methodology. With this method, the thermal and physical phenomena occurring at the interface of two thin polyethylene pieces assembled by fusion can be studied. It consists of a thermal welding phase and a phase of mechanical separation of the welded assembly. For the mechanical phase, an adaptation of the T-peel test was used. These conditions make it possible to determine the thermal welding parameters (temperature, time) for optimal mechanical quality of the joint, according to a criterion established by optimization of the peel test used. The variations in minimum temperature required for an optimum weld, as a function of heating rate, can be simulated with a numerical model based on the concept of macromolecular interdiffusion. Consistent with the experimental behavior, the numerical model involves two parameters characteristic of the diffusion behavior of the polyethylene resin. Thus, these parameters characterize the weldability of the polyethylene resin under study.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380114
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  • 4
    Electronic Resource
    Electronic Resource
    Zur übermolekularen Struktur hochmoduliger scherkristallisierter Polyethylen-FädenHerrn Professor Dr. Dr. h. c. Hermann Klare zum 80. Geburtstag gewidmet (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 308-314 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The supermolecular structures of polyethylene filaments prepared by crystallization from solution in extensional flow at different crystallization temperatures as well as of annealed and zone-drawn samples have been characterized by means of X-ray diffraction methods. The lattice distortions in the crystallites of such samples are quantitatively determined for the first time. The results show that a direct correlation between the crystallite dimensions and the amount of lattice distortions on the one hand and the axial Young's modulus on the other hand can be excluded. Based on X-ray, mechanical and shrinkage investigations, some parameters of the structure of the non-crystalline regions are estimated. A structure model for the high-modulus polyethylene filaments is discussed.
    Notes: Die übermolekulare Struktur scherkristallisierter PE-Fäden unterschiedlicher Kristallisationstemperatur sowie getemperter und zonengereckter Proben wird mittels Röntgenbeugung charakterisiert. Erstmalig an derartigen Fäden werden die Gitterstörungen in den Kristalliten quantitativ angegeben. Die Ergebnisse zeigen, daß ein direkter Zusammenhang zwischen den Kristallitgrößen und dem Ausmaß der Gitterstörungen einerseits und dem axialen E-Modulandereseits ausgeschlossen werden kann. Auf Basis von Röntgen-, Modul- und Schrumpfmessungen werden Abschätzungen zum Aufbau der ungeordneten Bereiche durchgeführt und daraus Modellvorstellungen zur Struktur hochmoduliger PE-Fäden mitgeteilt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400504
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  • 5
    Electronic Resource
    Electronic Resource
    Selective agonists for receptors of substance P and related neurokinins (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 81-90 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neurokinins and their receptors are a complex system consisting of at least three endogenous agents - substance P (SP), neurokinin A (NKA), and neurokinin B (NKB) - and their corresponding receptor types, respectively, NK-1, NK-2, and NK-3. Investigations on receptors have been made using sensitive and fairly selective pharmacological preparations (the dog carotid artery for the NK-1, the rabbit pulmonary artery devoid of endothelium for the NK-2, and the rat portal vein for the NK-3 receptor), and some natural peptides of mammalian and nonmammalian origin. Because of the nonselectivity of the natural peptides, analogues of the neurokinins have been found that act on one receptor only and show therefore high selectivity. The selective agonists [Sar9, Met(O2)11]SP, [Nle10]NKA (4-10), and [MePhe7]-NKB have been used successfully for (a) characterizing the three neurokinin receptors, (b) identifying isolated organs whose responses to neurokinins depend on the activation of a single (monoreceptor systems) or of more than one (multireceptor systems) receptor, and (c) elucidating some of the physiological function of the three receptor types. It is suggested that NK-1 mediate peripheral vasodilatation and exocrine secretions, NK-2 stimulate bronchial muscles and facilitate the release of catecholamines, and NK-3 promote the release of acetylcholine in peripheral organs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280111
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  • 6
    Electronic Resource
    Electronic Resource
    Anionic syntheses of terminally functionalized ethylene oligomers (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 4205-4226 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthetic procedures for preparation of terminally functionalized linear ethylene oligomers are described. The preferred synthetic method is anionic oligomerization of ethylene with n-butyllithium-tetramethylethylenediamine and electrophilic substitution of the living oligomer so-formed. Conditions and procedures for subsequent chemistry to elaborate the end groups of these oligomers are described. These procedures afford strictly linear ethylene oligomers which contain a wide variety of end groups and which range in molecular weight from 1000 to 4500 (Mn). The product oligomers were characterized spectroscopically as toluene-d8 solutions at 110°C using multinuclear NMR, FT-IR, fluorescence, and UV-visible spectroscopies as appropriate. Alternative stepwise approaches to such oligomers are also discussed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271226
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  • 7
    Electronic Resource
    Electronic Resource
    Copolymerization of α-methylstyrene and N-phenylmaleimide (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3227-3236 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the copolymerization of α-methylstyrene (α-MeSt) and N-phenylmaleimide (NPMI), the resulting copolymers were found to have a high alternating structure regardless of the ratio of comonomers in the feed. The monomer reactivity ratios were r1 = 0.21 (NPMI) and r2 = 0.03 (α-MeSt) (Kelen-Tüdös method), the equilibrium constant of CT complex K was 0.02 L mol-1, and the energy of activation EA was 73 kJ mol-1. From the equation Rp = Rp(f) + Rp(CT) proposed by Shirota and coworkers, Rp(f) and Rp(CT) were calculated, and it was found that in toluene the copolymerization proceeds predominantly by the addition of free monomers. Copolymers prepared at an equimolar ratio of comonomers in the feed have a glass transition temperature Tg of 539 K (DSC method).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271004
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly(t-butyl methacrylate-b-isoprene-b-t-butyl methacrylate) block copolymers by anionic techniques (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 4001-4012 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(t-butyl methacrylate-b-isoprene-b-t-butyl methacrylate) block copolymers have been synthesized in a controlled manner by anionic techniques. The block copolymers demonstrated predictable chemical composition and stereochemistry, and narrow molecular weight distributions. The addition of a polar solvent was required after complete conversion of the diene block in order to preserve the high 1,4 microstructure of the diene phase and to facilitate the efficient crossover to the poly(t-butyl methacrylate) lithium enolate. Thermomechanical analysis (TMA) of the triblock copolymers demonstrated a microphase separated morphology. The glass transition temperatures of the diene phase and acrylic phase were approximately -70 and 120°C, respectively. Cast films of the block copolymers from polar and nonpolar solvents were optically clear and elastic.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271211
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation-induced graft polymerization of metal-containing monomers (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 1935-1956 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Graft polymerization of acrylates and acrylamide complexes of Mn(II), Cr(III), Fe(III), Co(II), Ni(II), and Cu(II) from alcohol solutions onto a polyethylene powder preirradiated in air up to total doses of 10-300 kJ/kg was studied. Graft copolymers with a metal content of as high as 1.7 mass% were obtained. The addition of a σ- or a coordinate-bound metal atom to the monomer molecule (acrylic acid, acrylamide) was shown to decelerate the process of thermal homopolymerization by 4 to 8 times, significantly reduce the reaction order in respect with monomer concentration in solution, and in most cases produce no effect on the polymer chain termination mechanism. The grafting of metal-containing monomers was found not to alter the structure of the monomer unit, valent state, and coordination of the metal atom, either. The graft polymerization of the monomers from solution is distinguished by a weak effect of the radical reaction inhibitors. The effective activation energies for the grafting of the metal-containing monomers lie within 42-60 kJ/mol.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270615
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  • 10
    Electronic Resource
    Electronic Resource
    High resolution electron microscopy of the high-Tc Superconductor Bi2+xSr2Ca1-xCu2O8+δ (1989)
    Weinheim : Wiley-Blackwell
    Advanced Materials 1 (1989), S. 196-199 
    Details
    ISSN: 0935-9648
    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: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19890010605
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