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  • 1
    Electronic Resource
    Electronic Resource
    Fracture behavior in nylon 6 fibers (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1415-1445 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A reaction rate model of fracture in polymer fibers is described. This model assumes that bond rupture is governed by absolute reaction rate theory with a stress-aided activation energy. It is demonstrated that the key in obtaining good agreement between the model and experiment lies in taking proper account of the variation of stress on the tie-chain molecules. The more taut chains rupture first, and the load is redistributed among the remaining unruptured tie chains. The effect of varying the temperature both in the model and in experiments on fracture in fibers is explored. Good agreement between predictions of the model and experiment is possible only with an undeterstanding of the distribution in stress on the tie chains. The distribution in stress on the chains was experimentally determined by monitoring the kinetics of bond rupture with electron paramagnetic resonance (EPR) spectroscopy. Temperature is found to have two effects on macroscopic strength. (1) The thermal energy aids the atomic stress in breaking the atomic bonds; as a consequence the rate of bond rupture of a family of bonds under a given molecular stress is increased. In this respect temperature might be viewed as decreasing the “strength” of a bond. (2) Temperature also serves to “loosen” the molecular structure and in this way modify the distribution in stress on the tie chains. To explain bond rupture and macroscopic fracture behavior quantitatively, account must be taken of both effects.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100802
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  • 2
    Electronic Resource
    Electronic Resource
    Coupling of acrylic polymers and collagen by use of a water-soluble carbodiimide. I. Optimization of reaction conditions (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 3459-3472 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A means of coupling synthetic polymers of biomedical interest with collagen under mild conditions was investigated as a part of preliminary studies in the development of a biomedical adhesive. The coupling agent, 1-cyclohexyl-3-[2-morpholinyl-(4)-ethyl]carbodiimide, provides a covalent bond between the acrylic polymer and collagen. The variables affecting the establishment of this bond in solution are concentration of the carboxylic group on the acrylic polymer, concentration of the acid-soluble collagen, concentration of the coupling agent, pH, and time of reaction. Optimum values of these variables have been obtained experimentally.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170171105
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  • 3
    Electronic Resource
    Electronic Resource
    Coupling of acrylic polymers and collagen by use of a water-soluble carbodiimide. II. Investigations of the coupling mechanism (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 3473-3483 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The coupling mechanism involved in the coupling of acrylic polymers and collagen by a water-soluble carbodiimide was investigated. By the use of a series of homopolymers of α-amino acids, support was given to the postulate that a major proportion of the coupling takes place in the amino functional group. In light of the results presented the reaction is sterically controlled and the steric, stoichiometric, and kinetic aspects of the reaction are discussed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170171106
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  • 4
    Electronic Resource
    Electronic Resource
    A reinvestigation of the chemical reactivity of N-perfluoroacylaziridines (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 1089-1101 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It has been found that polymerization of perfluoroacylaziridine (1) occurs in the presence of acid. The polymers formed in the presence of acid have much higher uniformity of the unit structure and are of similar molecular weight to those obtained from anionic, or nucleophile-initiated, polymerization of aziridine (1). The polymers formed from polymerization of aziridine (1) in the presence of acid provide an accessible route to linear unbranched polyethylenimine.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170170414
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of films exhibiting a balanced temperature dependence to permeation by aqueous solutions - a study of lower consolute behavior (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 2551-2570 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Temperature dependence of solute transport through aqueously swollen polymeric films and membranes can be altered to show even apparent negative activation energies by the use of polymers exhibiting a lower consolute behavior in solution. The principles by which we constructed a host of such polymers are discussed. A solubility rule is presented which predicts that solutes in water will show a lower critical solution temperature if the proper hydrophilic-hydrophobic balance is achieved.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170131113
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  • 6
    Electronic Resource
    Electronic Resource
    The mass spectra of five diacetyl[3]ferrocenophanes (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 1279-1281 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric study of five diacetyl[3]ferrocenophanes has been made. The molecular ion was the base peak in these five compounds. Fragment ions with relative intensities greater than 10 percent occurred only in those compounds having an acetyl group in the alpha position to the trimethylene bridge.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210061112
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of polymers containing 1-phenyl-2-tetrazoline-5-thione groups (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2403-2405 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160927
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  • 8
    Electronic Resource
    Electronic Resource
    Acidity and stability of sulfonyl carbamates and ureas (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 3059-3061 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150091025
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