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  • 1
    Electronic Resource
    Electronic Resource
    Dilute solution properties of tactic poly(2-hydroxyethyl methacrylate) (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 3555-3561 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isotactic and syndiotactic poly(2-hydroxyethyl methacrylate) (PHEMA) have been prepared. Intrinsic viscosity-molecular weight relationships were established for the isotactic and syndiotactic PHEMA in N,N-dimethylformamide (DMF) at 25°C by solution viscometry and light scattering. The unperturbed dimensions and interaction parameters were examined in DMF, water, methanol, ethanol, and water-methanol (1:7 by volume) mixture for isotactic PHEMA and in DMF, methanol, and water-methanol (1:7 by volume) mixture for syndiotactic PHEMA using the Stockmayer-Fixman representation. The results suggest that the compact random coil structure for isotactic PHEMA occurs in water solvent and the isotactic PHEMA is more highly extended in polar solvents.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.170221166
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational properties of isotactic poly(2-hyroxyethyl methacrylate) in the mixed water-alcohol solvents (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 467-474 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational properties of isotactic poly(2-hydroxyethyl methacrylate) (PHEMA) have been studied in mixtures of water and several aliphatic alcohols by viscometry and fluorometry. The highest fluorescence intensity of auramine has been detected in aqueous isotactic PHEMA solution compared with several aliphatic alcohol systems. Upon aliphatic alcohol addition, there was the decrease of fluorescence intensity of auramine. As the number of aliphatic group of alcohol increases, the decrease of fluorescence intensity of auramine has been pronounced. And the sharp increases of the reduced viscosity of isotactic PHEMA in water-alcohol solvents were observed in the lower region of alcohol volume percentage with the increasing number of aliphatic group of alcohol. Nevertheless, the sharp increase of the reduced viscosity of isotactic PHEMA in ethyleneglycol-water solvent was obtained even at a low-volume percentage region of ethyleneglycol at which compact structures exist. Therefore, we consider that the increase of viscosity at this region is due to the hydrophilic side group of polymer-solvent interaction, forming hydrogen bonds. The experimental results suggest that compact structures of isotactic PHEMA in aqueous solution are caused by hydrophobic interactions by methyl group of polymer backbone, and the hydrophobic interaction by adding alcohols. Finally, our study brings the fact that the solvating sites of alcohols on the isotactic PHEMA molecule are strongly influenced by the number of hydroxyl and aliphatic group in alcohols.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250203
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of ureas on the viscometric behavior of water-soluble isotactic poly(2-hydroxyethyl methacrylate) (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 237-244 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isotactic poly(2-hydroxyethyl methacrylate) (PHEMA) is soluble and has the compact random coil structure in water solution. The effect of six ureas (thiourea, urea, methylurea, ethylurea, 1,3-dimethylurea, and tetramethylurea) on the viscometric behavior of aqueous solutions of isotactic PHEMA as a function of urea concentrations at 25°C has been investigated. The compact random coil structure is found to disappear as ureas are added. The result is discussed in terms of water structure breaking and making effect of solutes, and hydrophobic interactions. In addition, experiments were performed with aqueous isotactic PHEMA solutions at four different temperatures. Isotactic PHEMA in pure water has the most compact conformation at 20°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270120
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    Paper (German National Licenses)
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