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  • 1
    Digitale Medien
    Digitale Medien
    The synthesis and XPS characterization of iodine containing plasma polymers (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 923-929 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Plasma polymers derived from iodobenzene and four copolymers with benzene of varying monomer ratios have been synthesized. Samples were analyzed for qualitative and quantitative information using x-ray photoelectron spectroscopy. The optimum conditions whereby a higher iodine content is obtained in the plasma polymer have been achieved. The results indicate that the use of a copolymerization approach is better. These plasma polymers were subsequently exposed to an oxygen plasma and it was found that oxidation and etching of the surfaces of the plasma polymers does occur. The extent of iodine loss via oxygen plasma etching appears dependent on the character of the plasma polymer.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1990.080280417
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  • 2
    Digitale Medien
    Digitale Medien
    Alginate-chitosan coacervation in production of artificial seeds (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 42 (1993), S. 449-454 
    Details
    ISSN: 0006-3592
    Schlagwort(e): artificial seed ; sodium alginate ; chitosan ; complex coacervation ; encapsulation ; embryoid viability ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Survival of secondary embryoids of winter oilseed rape (Brassica napus ssp. oleifera cv. Primor) has been used as an assay for the development of artificial seeds involving complex coacervation of alginate (polyanion) with chitosan (polycation). Germination frequency of 100% was achieved for encapsulated embryoids when alginate formed the inner matrix and chitosan the outer layer. When the matrix makeup was reversed, there was no germination of embryoids. The artificial seeds produced were hardened in dilute alkaline solutions of NaOH and Ca(OH)2. An optimum setting time could be selected based on a quantitative measurement of resistance of hardened capsules to compression and the germination frequency of the encapsulated embryoids. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260420407
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  • 3
    Digitale Medien
    Digitale Medien
    Interaction of collagen with polypyrrole in the production of hybrid materials (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 53-59 
    Details
    ISSN: 0959-8103
    Schlagwort(e): collagen ; pyrrole ; polypyrrole ; hybrid materials ; biomaterials ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A series of collagen-polypyrrole hybrid materials have been synthesized by the chemical polymerization of pyrrole using FeCl3 as initiator in the presence of soluble collagen. The black color of the resulting materials indicates the presence of polypyrrole while collagen was verified by amino acid analysis of the hybrids. Collagen incorporation into the hybrid was found to be a function of pyrrole concentration used in the polymerization. When the concentrationof pyrrole was high, the collagen loading was low and vice versa. This inverse relationship was also found in the hybrids' electrical conductivity. A 26% collagen content in the hybrid gave a conductivity of 1.4 S cm-1 while a 4% collagen gave a higher value of 62.4 S cm-1. Thermogravimetric data suggest that the two polymers exist in the hybrid as a blend. The nature of the interaction of the components in the hybrid is believed to be strong since collagen could not be extracted despite denaturation with sodium dodecylsulfate.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pi.1994.210350105
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