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  • 1
    Electronic Resource
    Electronic Resource
    A new synthetic elastomer based on a chlorophosphonated polyolefin (1961)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 157-162 
    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: A new synthetic elastomer has been obtained based on an ethylene-propylene copolymer prepared using an organometallic catalyst system. Reactive sites (phosphonyl dichloride groups) are placed on the copolymer chain by treating the polymer with phosphorus trichloride and oxygen. After hydrolysis or alcoholysis of the phosphonyl dichloride groups to phosphonic acid or phosphonic acid esters, vulcanization may be carried out by reaction with metallic oxides, particularly lead oxide. Vulcanizates of the polyolefin elastomer have outstanding resistance to heat, ozone, and oxygen, and have excellent electrical properties. This combination suggests the use of this material in high temperature electrical applications.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1961.070051405
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  • 2
    Electronic Resource
    Electronic Resource
    Polyimides from diisocyanates, dianhydrides, and tetracarboxylic acids (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2961-2980 
    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: High molecular weight polyimide resins have been prepared by the reaction of diisocyanates and a mixture of dianhydrides and their acids in the presence of a tertiary amine catalyst. The polyimides thus formed can be made into tough flexible films similar to those polyimides prepared by the conventional method of reacting a dianhydride with a diamine. The preparation of high molecular weight polymer is affected by the purity of reagents, the anhydride-acid ratio, temperature, and moisture. Evidence from model compound studies is presented regarding the nature of the reaction mechanism.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070191103
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  • 3
    Electronic Resource
    Electronic Resource
    Polyimides from diisocyanates, dianhydrides, and their dialkyl esters (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 1983-1990 
    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: High molecular weight polyimide polymers have been prepared by the reaction of dissocyanates and a mixture of dianhydrides and their dialkyl esters in aprotic solvents. No catalyst is necessary, but high polymer formation is affected by the anhydride/ester ratio and temperature. Dianhydrides such as PMDA, BTDA, TMA, and their esters have been used successfully. Mixtures of these materials have also been used. Tough, flexible films can be obtained from these polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220719
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  • 4
    Electronic Resource
    Electronic Resource
    Transient diffusion effects in the study of early platelet adhesion (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 145-160 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: In the study of interactions of blood with artificial surfaces, it is common practice to wet these surfaces with a saline solution before exposing them to blood. The effect of this procedure on subsequent adhesion of blood platelets has been investigated both theoretically and experimentally, with a spinning disc apparatus. A large part of the observed delay in the initiation of platelet adhesion when using this apparatus is attributed to the time involved in displacing the prewetting fluid and bringing platelets near the surface. This observation is relevant to speculations of other researchers about the time course of adhesion-related reactions at the surface-proper. Other theoretical solutions are developed for the transient Leveque problem, which relates to a uniform shear-flow near a surface, and for a stagnation point apparatus. These solutions are compared with delay effects noticed in experimental data published by others.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100113
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  • 5
    Electronic Resource
    Electronic Resource
    Structural dependence of the electrical conductivity of polyethylene terephthalatePaper presented at the 30th Conference on Electrical Insulation, National Academy of Sciences-National Research Council, October 23, 1961, Pocono Manor, Pa. (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 62 (1962), S. 331-346 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The direct current conductivity of three different forms of polyethylene terephthalate was studied over a wide temperature and voltage range to determine the structural dependence of the conduction process. From the films in the amorphous, crystallized, and oriented and crystallized forms it was determined that crystallization reduces the conductivity by more than one order of magnitude. Orientation results in a sixfold decrease in conductivity. The conductivity does not change over a wide range of molecular weight or carboxyl end group concentration. As shown from model polymers and copolymers, disruption of chain symmetry and molecular packing, introduction of side chains, or any other modification which reduces the crystallinity and order, results in greater conductivity. The structural dependence of conductivity, the temperature dependence, and the current-voltage relationships of polyethylene terephthalate are consistent with a proposed ionic mechanism for the conduction process.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1962.1206217406
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  • 6
    Electronic Resource
    Electronic Resource
    A new synthetic elastomer based on a chlorophosphonated polyolefin. II. Effect of polyolefin structure on vulcanizate properties (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 55 (1961), S. 799-810 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The paper describes the effect of ethylene-propylene copolymer structure on the properties of vulcanized, chlorophosphonated ethylene-propylene copolymer. The crystallinity of copolymer has a marked effect on vulcanizate properties. The more crystalline the copolymer, the higher hysteresis values and permanent set are for the vulcanizate. The catalyst used for the copolymerization of ethylene and propylene affects crystallinity markedly, titanium trichloride as a catalyst component giving a more crystalline copolymer than does the use of vanadium salts. Copolymer molecular weight has an effect on vulcanizate tensile strength but no effect on heat stability, elongation, and hysteresis loss.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205516232
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  • 7
    Electronic Resource
    Electronic Resource
    N,N′-(disubstitutedmethylene)bisacrylamides: Preparation and polymerizationIn honor of C. S. Marvel on the occasion of his 75th birthday. (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 1967-1980 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparative methods for the previously unreported N,N′-(disubstitutedmethylene)-bisacrylamides are presented. The solubility and thermal stability of these new bisamides are compared to the well known N,N′-methylenebisacrylamide. N,N′-Isopropyl-idenebisacrylamide, one of these new compounds, readily copolymerizes with a variety of vinyl monomers. It forms high molecular weight copolymers by the conjugate polyaddition of alkanedithiols or piperazine.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150080806
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