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  • 11
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hydrophilic polymers were prepared by radiation cast-polymerization of methoxypolyethyleneglycole methacrylate monomers for biomedical applications, and the relationship between physical characterization and molecular structure was studied. As the number, n, of oxyethylene units, -(OCH2CH2) n -, in the monomers increased, the hydration ability of the polymers increased markedly until n = 4 and after that increased moderately. The mechanical properties, such as tensile and tear strength decreased, and the elongation at break increased to a maximum and then decreased with increasing n. This appeared to be a characteristic of the polymers of methoxypolyethyleneglycole methacrylate monomers. The mechanical properties of the copolymers resulting from the copolymerization of methoxypolyethyleneglycole methacrylate with hydroxyhexyl methacrylate monomer were also studied.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 1616-1621 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polymeric materials having a porous structure were prepared by radiation polymerization of 2-hydroxyethyl methacrylate-water system at various temperatures, and its nature was studied. The materials prepared at low irradiation temperatures below about −20°C had a cylindrical (continuous) pore structure, and those at high irradiation temperatures 0°C had a noncontinuous pore structure. The pore size varied with radiation polymerization conditions such as monomer concentration, irradiation temperature etc. The orientation of the pore in the materials prepared at low irradiation temperatures was observed.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 24 (1989), S. 1809-1813 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Porous polymer composite columns having porous structure were prepared by radiation cast-polymerization of hydrophilic monomers at low temperature and their characteristics were studied. The porosity of the polymer increased with decreasing monomer concentration. The elution time of water in the polymer column increased with increasing monomer concentration and with decreasing irradiation temperature. The elution time was dependent on the degree of hydration of the polymer. The polymer with a degree of hydration of 0.2 to 0.4 gave the minimum elution time. The elution time decreased with the addition of porous inorganic substances.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 18 (1983), S. 1335-1340 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hydrophilic polymeric membranes were prepared by radiation cast-copolymerization of ethyl acrylate with various diacrylates and dimethacrylates. The hydration and mechanical properties of the copolymers were studied as a function of copolymerization composition. The degree of hydration, tensile strength, tear strength, elongation at break, and Young's modulus increased with decreasing concentration of the ethyl acrylate component. In a certain copolymerization composition, the hydrophilic polymeric membranes which resemble the mechanical property of the biomedical materials were obtained.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 20 (1985), S. 1509-1513 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Biocatalytic materials having a porous structure have been prepared by radiation polymerization at low temperatures using hydrophilic 2-hydroxyethyl methacrylate monomer andα-glucosidase. The biocatalytic (enzyme) activity of the materials was examined by enzyme reaction. The enzyme activity was affected by the pore size and surface area, and the optimum pore diameter giving a high enzyme activity was 20 to 40μm. The enzyme activity was also affected by irradiation temperature and addition concentration of crosslinking monomer. The heat and pH stability of the materials were higher than those of the native enzyme.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 21 (1986), S. 3179-3182 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The interaction of proteins such as humanγ-globulin with the surface of polymers was studied. The adsorption of theγ-globulin was affected by the hydrophilicity (degree of hydration) of the polymers, in which optimum hydrophilicity appeared to exist for the adsorption of theγ-globulin. This feature was also observed in the adsorption of theγ-globulin on copolymers having various hydrophilic properties. The surface of the polymers was modified by radiation graft polymerization and the addition of a surfactant, and its effect on the interaction with theγ-globulin was studied.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 0887-624X
    Keywords: acryloyl-L-proline methyl ester (A-ProOMe) ; methacryloyl-L-proline methyl ester (MA-ProOMe) ; porous gel membranes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermoresponsive porous gel membranes were synthesized by a simultaneously occurring process consisting of radiation-induced polymerization and crosslinking in aqueous solutions at various concentrations of acryloyl-L-proline methyl ester(A-ProOMe) without a crosslinker. Permeation of p-nitrophenol (PNP) through a thermoresponsive porous gel membrane obtained at a monomer concentration of 80% (w/w) drastically reduced around 14°C, the lower critical solution temperature (LCST) of linear poly(A-ProOMe) in water, from 0.60 × 10-3 cm/min at 10°C to no permeation at 18°C, accompanied by changes in both size and shape of pores associated with gel shrinkage. Moreover, it was found that porous gel membranes with a porosity of approximately 60% had a greater PNP permeability constant through porous gel membranes with mutually connected pores obtained at a monomer concentration of 50% (w/w) than individually supported pores obtained at a monomer concentration of 70% (w/w). © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1495-1500, 1998
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 27 (1989), S. 437-442 
    ISSN: 0887-6258
    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
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  • 19
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 177-184 
    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: The adsorption of human γ-globulin on polymer surfaces having various chemical and physical structures was studied. The γ-globulin adsorption on the crosslinked, rigid polymers of polyethyleneglycol dimethacrylate was considerably affected by the length of oxyethylene chains, in which the hydrophilicity of the polymers increased as the oxyethylene chains lengthened. The γ-globulin adsorption on the rigid polymers of tetraethyleneglycol dimethacrylate (or diacrylate) was lower than other soft polymers such as hydrogel, owing to the presence of oxyethylene chains. The polymer having a porous structure appeared to be a high adsorption material for the γ-globulin and the degree of the adsorption varied with pore size.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2167-2175 
    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: The influence of the hydrratin ability of monomer on the immobilization of microbial cells by radiation polymerization was studied using various acrylate and diacrylate monomers. The heats of mixing of the monomers in water were determined, and the hydratin abilities of monomer and polymer were evaluated by heat of mising and water content. The shape of the immobilized cell composites varied with the hydratin ability of monomer. The enzymatic activity of the immobilized cell composites varied with the number of ethyleneglycol or methylene units in the monomers. In the immobilization using acrylate monomers, the increase of the hydration ability of the monomer introduced a spongelike composite to the formation of the immobilized cells, and, in diacrylate monomers, the increase of the hydration ability of the monomer introduced a flakelike composite to the formation of the immobilized cells, by which enzymatic activity increased.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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