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  • Articles  (446)
  • Polymer and Materials Science  (385)
  • Life and Medical Sciences  (61)
  • ASTROPHYSICS
  • 1980-1984  (283)
  • 1970-1974  (163)
  • 1940-1944
  • 1980  (283)
  • 1970  (163)
  • 11
    Electronic Resource
    Electronic Resource
    Thermal transitions in mixtures of polydeoxyribodinucleotides (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1105-1117 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oligo d(C-A) and oligo d(T-G) of known average lengths, prepared by a combination of chemical and enzymatic procedures, have been mixed in 0.02 M and 0.07 M Na+, and absorbance has been studied as a function of increasing temperature. The transitions have been analyzed for the temperature of maximum slope Tm, the breadth of the transition, the value of the slope at Tm, and the maximum hyperchromicity. Linear expressions have been found relating the inverse of the length in nucleotide units (n-1) of the shorter oligomer, irrespective of its identity, to Tm and also to the transition breadth. From a difference in slope between the Tm versus n-1 expressions for the two molarities, the entropy and enthalpy of melting have been calculated as a function of n-1.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090911
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  • 12
    Electronic Resource
    Electronic Resource
    13C-1H magnetic double-resonance study of fetal enamel matrix proteins (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 741-750 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Recently developed 13C-1H nuclear magnetic double-resonance techniques have been used to study proteins in the intact fetal enamel matrix. Enamel protein chains undergoing rapid, almost isotropic motion were detected in scalar decoupled 13C-nmr spectra, while motionally restricted enamel protein chains were principally observed in proton-enhanced spectra. The latter spectra were obtained using a matched Hartmann-Hahn contact to transfer polarization from protons to carbons (cross-polarization). Both mobile and motionally restricted enamel protein chains were observed in dipolar decoupled 13C-nmr spectra. A comparison of integrated intensities obtained from the scalar decoupled and dipolar decoupled spectra showed that 70% of the fetal enamel protein chains exhibit rapid, nearly isotropic molecular motion (τ ≲ 10-6 sec), while the remaining 30% are rigid or undergo only anisotropic molecular motion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1980.360190403
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  • 13
    Electronic Resource
    Electronic Resource
    Effects of pH and ionic strength on the structure of collagen fibrils (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 965-975 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The roles of pH and ionic strength on the structure and stability of collagen fibrils have been investigated by means of x-ray and neutron diffraction techniques. High-angle x-ray diffraction shows that a salt concentration of 0.5M KCl is sufficient to reduce the osmotic swelling and related disordering in the pH range 1-3. The relative intensities of the low-angle meridional x-ray and neutron diffraction Bragg reflections vary with pH. Difference Fourier syntheses between pH 7 and 1.6 data indicate, for both x-ray and neutron diffraction, a reduced scattering contribution from the telopeptides at low pH. Lyotropic relaxation is a crucial step in the appearance at low pH of a doubling of the 668-Å axial periodicity (D) of collagen fibrils. These results suggest that electrostatic interactions are essential for the structural stability of the telopeptide regions and of the 1D and 3D intermolecular staggers between collagen molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1980.360190503
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  • 14
    Electronic Resource
    Electronic Resource
    Functionalization of polymer supports for polymerization catalysts by graft polymerization method (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 349-357 
    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 specific features of the gas-phase radiation-induced and plasma-initiated graft polymerization of certain monomers possessing the functionality needed for immobilization of transition metal compounds were studied. The radiation yields of allyl monomers grafted to polyethylene, polypropylene, and poly(vinyl chloride) (5-25 molecules/100 eV) were found to be close to the radiation yields of the polymerization of these monomers in a liquid state. The kinetics of methyl methacrylate and acrylic acid postgrafting to polyethylene pretreated with helium discharge plasma were also studied. The graft-initiating effect of PE powder treated with plasma for 5-10 min was found to be comparable with that of γ-irradiation in a dose 0.5-4 Mrad. The results of immobilization of transition metal compounds [TiCl4, VCI4, VO(OC2H5)3, Ti(OC4H9)4, etc.] on carriers prepared by the method of polymer support functionalization by grafting are described. The extent of completion of the immobilization reaction is found to vary from 0.1 to 0.96 and to depend both on the nature of the transition metal and on the specificity of the grafted fragments.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250302
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  • 15
    Electronic Resource
    Electronic Resource
    A similarity criterion of the optimal process in melt spinning (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1165-1178 
    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: Experimental and simulation studies of optimization of the melt spinning process were carried out for nylon 6 fibers. The experiment and process simulation demonstrated that one criterion that can be applied in scaling up an optimized melt spinning process is to achieve the similar real time history of temperature and deformation rate in the spinway. Some aspects of the experiments and process simulation are discussed, together with the results of real time history analysis for a case of nylon 6 spinning.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250619
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  • 16
    Electronic Resource
    Electronic Resource
    Interpretive nonlinear viscoelasticity: Dynamic properties of nylon 6, nylon 66, and nylon 12 fibers (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 2063-2104 
    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: Nonlinear response of nylon 6, nylon 66, and nylon 12 fibers to sinusoidal straining under relatively large strain amplitude is analyzed in terms of the changes in properties during the straining, i.e., the change in modulus, change in internal friction and change in structure which involves energy release or absorption in straining. Modulus generally increases with strain but it decreases with increase of strain amplitude, the effect of strain amplitude being largest with nylon 6 and smallest with nylon 66. Mechanical loss increase with the increase of strain amplitudes in nonlinear manner, and the magnitude of change is largest with nylon 66 and smallest with nylon 6. During the extension phase, structural change occurring in nylon 6 is predominantly an increase in order or orientation while that with nylon 66 is crack opening or cavitation. Various aspects of the experiments and analysis of the data are described in detail.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250920
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  • 17
    Electronic Resource
    Electronic Resource
    Glass-rubber transition behavior and compatibility of polymer pairs: Poly(ethyl acrylate) and poly(methyl methacrylate) (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 73-78 
    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: A series of interpenetrating polymer networks were prepared containing PMMA and PEA as their two components. Corresponding telomer mixtures and random copolymers were also prepared for comparison purposes. The glass-rubber transition studies were made via shear modulus and dilatometric measurements. The results indicate one very broad transition for the IPN's rather than two transitions expected for incompatible polymer pairs. An interpretation based on the compatibility or near-compatibility of the PEA/PMMA pair is offered.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140108
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  • 18
    Electronic Resource
    Electronic Resource
    Radiation-convertible polymers from norbornenyl derivatives. Crosslinking with ionizing radiation (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 1659-1670 
    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: Vinyl polymers with pendant norbornenyl (bicyclo[2.2.1]heptenyl) groups crosslink rapidly on exposure to ionizing radiation. Analysis (according to Charlesby-Pinner theory) of extraction data from an ethylene-vinyl acetate copolymer and the corresponding ethylene-vinyl norbornenecarboxylate copolymer shows that the unsaturated polymer crosslinks by a chain reaction. At low doses, the kinetic chain length is about 4. Pendant norbornenyl groups accelerate crosslinking of a vinyl alcohol-vinyl acetate-vinyl chloride copolymer and convert poly(vinyl alcohols) and cellulose acetate from degrading to crosslinking polymers. A novel application of the Charlesby-Pinner plot strongly suggests linear dependence of the extent of crosslinking on the norbornenyl group concentration in a series of modified poly(vinyl alcohols). The greater effectiveness of pendant norbornenyl groups, compared to cyclohexenyl groups, demonstrates the importance of the reactivity of the double bond.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140701
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  • 19
    Electronic Resource
    Electronic Resource
    On the presence of crystallinity in hydrogenated polybutadienes (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 2416-2420 
    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
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140922
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  • 20
    Electronic Resource
    Electronic Resource
    Trans-gauche rotational isomers in partially oriented poly(ethylene terephthalate) fibersIssued as NRCC #18317. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1505-1507 
    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
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250723
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