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  • Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Copolymers in dilute solution. I. Preliminary results for styrene-methyl methacrylateWork supported in part by Office of Ordnance Research. (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1005-1018 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dilute solution properties of copolymers are briefly discussed in relation to those of the parent homopolymers. It is shown that copolymer molecules are usually more expanded in solution than would be expected from the averaged behavior of the pure polymers, because of repulsive interactions between the unlike monomer units. A thermodynamic parameter χAB characterizing these interactions can be derived from measurements of the dilute solution properties of copolymers. In favorable cases this parameter can be independently evaluated from studies of ternary systems composed of the two parent homopolymers and a solvent, thus allowing prediction of the behavior of the copolymer. Light scattering and viscosity measurements on fractions of approximately equimolal copolymers of styrene and methyl methacrylate are presented and analyzed. The values of χAB deduced from the results in two solvents agree satisfactorily with each other, but are somewhat larger than those earlier obtained from measurements on ternary systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1996.905
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymers in dilute solution. I. Preliminary results for styrene-methyl methacrylateWork supported in part by Office of Ordnance Research. (1955)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 16 (1955), S. 517-530 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dilute solution properties of copolymers are briefly discussed in relation to those of the parent homopolymers. It is shown that copolymer molecules are usually more expanded in solution than would be expected from the averaged behavior of the pure polymers, because of repulsive interactions between the unlike monomer units. A thermodynamic parameter χAB characterizing these interactions can be derived from measurements of the dilute solution properties of copolymers. In favorable cases this parameter can be independently evaluated from studies of ternary systems composed of the two parent homopolymers and a solvent, thus allowing prediction of the behavior of the copolymer. Light scattering and viscosity measurements on fractions of approximately equimolal copolymers of styrene and methyl methacrylate are presented and analyzed. The values of χAB deduced from the results in two solvents agree satisfactorily with each other, but are somewhat larger than those earlier obtained from measurements on ternary systems.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1955.120168236
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Helix-coil transition in heterogeneous chains. II. DNA model (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 205-221 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Melting curves are calculated for infinitely long DNA-like random copolymers composed of AT and GC pairs of nucleotides. The entropy of random coil rings formed on melting is explicitly included through use of the Jacobson-Stockmayer ring-weighting factors. Transition curves are calculated for values of the cooperativity parameter σ in the range 10-2 ≤ σ ≤ 10-4. Ninety percent of the melting occurs in ca. 0.2°C for σ ≤ 10-3 regardless of the mole fraction of GC. We conclude that observed breadths of thermal denaturation curves for native DNAs result from a superposition of essentially all-or-none melting of various regions of the molecule. It is argued that refined approximations to the ring-weighting factors are probably not important when compared with the effects produced by long-range base sequence correlations which are known to occur in native DNA.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090206
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    Paper (German National Licenses)
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