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  • Polymer and Materials Science  (5)
  • 1975-1979  (5)
  • 1978  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization of glycine/β-benzyl-L-aspartate copolymer in the course of polymerization (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1231-1237 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to examine the structure and growth mechanism of copolymer crystals formed during polymerization, the heterogeneous copolymerization of glycine N-carboxy anhydride and β-benzyl-L-aspartate N-carboxy anhydride, initiated by butylamine, was studied in acetonitrile. In all the copolymerization systems, the crystal growth took place through formation of the cross-β structure, i.e., the introduction of glycine residues into the poly(β-benzyl-L-aspartate) chain during this particular copolymerization broke the α-helix of poly(β-benzyl-L-aspartate). The growth mechanism of the copolymer crystals was compared with that for poly(β-benzyl-L-aspartate) crystals reported previously.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790511
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization of polypeptides in the course of polymerization, 7.Part 6: cf. 6. Crystallization of poly(γ-methyl-L-glutamate), poly(γ-benzyl-L-glutamate) and poly(β-benzyl-L-aspartate) (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 373-385 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Heterogeneous polymerizations of γ-methyl-L-glutamate N-carboxy anhydride (NCA), γ-benzyl-L-glutmate NCA, and β-benzyl-L-aspartate NCA were carried out using butylamine as initiator in acetonitrile at 30°C. The oligomer chains formed in the beginning of the polymerization crystallized into the antiparallel β-form and thereafter the α-helical chains grew from the active sites of the β-chains. The polymerization of γ-methyl-L-gultamate NCA proceeded to 100% conversion and accordingly gave rise to high molecular weight poly(γ-methyl-L-glutamate). The polymerizations of γ-benzyl-L-glutamate NCA and β-benzyl-L-aspartate NCA stopped at 54% and 16%, resp. The levelling-off of the conversion at such low values, in spite of the α-helical chain growth, may be due to the occlusion of the active chain ends of the resultant poly(γ-benzyl-L-glutamate) and poly(β-benzyl-L-aspartate) into the crystals. It was concluded that the interlamellar crystallization was induced by the intermolecular interaction between the benzyl groups of the polymer side chains, giving rise to the occlusion of the active growing chain ends into the interstices of the crystal formed during the polymerization.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790212
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  • 3
    Electronic Resource
    Electronic Resource
    Chain conformation of polystyrene in bulk by small-angle X-ray scattering (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 889-895 
    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: Small-angle x-ray scattering from solid solutions of different molecular weight fractions of partially brominated polystyrene in polystyrene has been studied. The results of this study indicate that polymer chains in bulk have a radius of gyration proportional to the square root of molecular weight, which is consistent with the random coil model. However, these radii are approximately 20% larger than the unperturbed radii deduced by light scattering in dilute solutions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220402
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  • 4
    Electronic Resource
    Electronic Resource
    Polycycloalkylene-siloxane polymers: Synthesis and thermal study (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 483-490 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on dicyclopentadiene and silacyclopentene, two linear polycycloalkylene-siloxane polymer systems have been synthesized and the thermal stability of the raw polymers evaluated by differential scanning calorimetry and thermal gravimetric analysis. The DSC data in nitrogen indicate that both polymer systems have excellent thermal stability. In air, these polymers begin to oxidize at approximately 150°C, with catastrophic oxidation occurring at about 400°C.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160219
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and property comparisons of random and alternating hybrid fluorocarbon-fluorosilicone copolymers (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 1929-1941 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a number of random and alternating copolymers of a fluorosiloxane and a hybrid fluorocarbon-fluorosiloxane are described, along with property comparisons. The random copolymers were prepared by silanol-chlorosilane condensation, while the alternating copolymer preparation involved the use of the novel silanol - silyl-N-methylacetamido condensation reaction, which was used to produce a high polymer, M̄n = 260,000. The physical properties of the two classes of polymers which were compared include: glass transition temperatures, reversion resistance, and thermal and oxidative weight loss. From these comparisons, it was possible to gauge the relative effects of backbone architecture, as well as monomer ratios, upon copolymer properties. Comparison of the thermogravimetric analysis (TGA) of both the random and alternating LS/FCS copolymer systems with the parent LS and FCS homopolymers indicates that the copolymer generally show little variation among themselves, but better thermal characteristics than either of the parents.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160812
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