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  • Articles: DFG German National Licenses  (3)
  • Physics  (2)
  • complex formation  (1)
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  • Articles: DFG German National Licenses  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The conformational effect of form I helical poly(L-proline) and form II helical poly(L-proline) to the complex formation with helical poly(L-glutamic acid) through hydrogen bonding (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 3377-3385 
    Details
    ISSN: 0887-624X
    Keywords: poly(L-proline) ; hydrogen bonding ; complex formation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex formation between helical poly-L-glutamic acid (PLGA) and helical poly-L-proline (PLP) was studied in a methanol-water (2 : 1) cosolvent and a propanol-water cosolvent (9 : 1). Reduced viscosity, circular dichroism, pH, and molar absorptivity were measured. The experimental results exhibit that the interpolymer complex was formed between helical PLGA and helical PLP through hydrogen bonding. When the complex was formed the unit mole ratio of PLGA : PLP(II) is 2 : 1 and PLGA : PLP(I) is 1.5 : 1, the ability of complex formation of PLP (II) with PLGA is better than that of PLP(I). On complexation the conformations of PLGA and PLP change and this change is more enhanced in the PLGA-PLP(II) than the PLGA-PLP(I) complex; its cause is studied. © 1993 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080311326
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dilute solution properties of branched polymers (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 1119-1124 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For calculating the ratio of the intrinsic viscosities of branched and linear polymers of the same molecular weight, [η]B/[η]L, a new theory taking into account the excluded volume effect is presented. By using the modified Flory equation, the excluded volume effect of branched polymers is predicted with the aid of the first-order perturbation theory. The linear expansion factor αs is converted to the hydrodynamic expansion factor αη by using the Kurata-Yamakawa theory. Our calculated results, i.e., [η]B/[η]L and 〈s2〉B/〈s2〉L, agree well with experiment for various type branched polymers, i.e., randomly branched and comb-shaped polymers of poly(vinyl acetate).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230416
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular dimensions of polypeptides in helicogenic solvents (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 215-221 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dependence of the molecular dimension of polypeptides in helicogenic solvents on molecular weight was calculated by using the Zimm-Bragg-Nagai theory in collaboration with the broken-rod model, in which the excluded volume effect was taken into account by setting the equivalent chain to be a nonintersecting chain. Our calculated results for PBLG in helicogenic solvents were compared with experiment with good agreement. The flexibility of the helices of PCBL and PELG as broken rods corresponded to that of PBLG without excluded volume effect (i.e., the broken rod of a self-intersecting chain) in a comparison of their experimental data with our calculated results for PBLG of self-intersecting and nonintersecting chains. Over a wide range of molecular weights M our theory explains the dependence of the length per monomeric residue h on M, even for short chains in which h 〉 1.5 Å.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230121
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    Paper (German National Licenses)
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