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  • 1
    Electronic Resource
    Electronic Resource
    Partial molal volumes of polymers in aqueous solutions from partial molal volume group contributions (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 121-126 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It is shown that the partial molal volumes (pmv) of the repeat units of nonionic polymers in aqueous solutions calculated from pmv group contributions, obtained from pmv data for small molecules and salts in aqueous solutions, agree in most instances to within ± 1 cm3/mole with the experimental values. The pmv of ionic polymers calculated from pmv group contributions have been found to be always larger than the experimental values. The difference gives a lower bound of the cooperative electrostrictive effect of neighboring charged sites of the polymer chain on surrounding water molecules.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180110
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic studies in relation to the helix-coil transition in aqueous solutions of poly-L-lysine (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 2635-2638 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360101226
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic absorption studies of poly-benzyl-L-aspartate in mixed solvents, in relation to the helix-coil transition (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 79-87 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultrasonic absorption measurements were carried out on solutions of polybenzyl-L-aspartate (PBLA) in chloroform-dichloroacetic acid (DCA) and in 1,2-dichloroethane (DCE)-DCA, in the range 3.9-155 MHZ. The helix-coil transition of PBLA produces an increase of absorption which is larger in CHCl3-DCA than in DCE-DCA solutions. The influence of the solvent on the excess ultrasonic absorption suggests that solvation processes may be involved in these changes of absorption. The plots of the absorption vs. the volume fraction of DCA do not show any absorption maximum. This indicates that the ultrasonic absorption is not sensitive to the helix-coil equilibrium of PBLA in the frequency range investigated. A maximum value of 109 S-1 has been obtained for the rate constant of growth of a helix region.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120108
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