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  • 1
    Electronic Resource
    Electronic Resource
    Feasibility of methylmethacrylate polymerization for bone cement by suspension polymerization in a gel phase (1994)
    Springer
    Journal of materials science 5 (1994), S. 587-591 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: A thermo-kinetic model for a new suspension polymerization process to produce bone cement powder is developed. Polymerization is accomplished in a batch process in which the suspending phase is a gelled solution of water and agarose, which immobilizes the polymerizing particles all along the reaction. This “static” process is meant to produce polymethylmethacrylate particles of high purity, given that no suspending agent is needed, and of desired size. Owing to the absence of agitation, temperature profiles are of primary concern to ensure gel stability and desired molecular weight distributions. A reliable model is therefore required for the description of the basic thermal and kinetic phenomena and for reactor scale-up. The model predicts time and space profiles of temperature, conversion and polymer distributions. A good agreement with experimental data indicates that the model can be used with confidence in design and control studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120335
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dehydro-thermally cross-linked collagen-poly(vinyl alcohol) blends: mechanical, biological and surface properties (1996)
    Springer
    Journal of materials science 7 (1996), S. 297-300 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: The mechanical, biological and surface properties of films, based on blends of soluble collagen and poly(vinyl alcohol), were investigated. Films prepared by casting were cross-linked by a dehydro-thermal treatment. The mechanical behaviour of the materials was studied by dynamic-mechanical thermal analysis. The biological properties of the films were evaluated by performing cytotoxicity and cytocompatibility in vitro tests. Surface characterization was carried out by X-ray electron spectroscopy. The results obtained indicate that these materials behave as two-phase systems and a remarkable enrichment of collagen in the surface with respect to the bulk was observed. Cytocompatibility tests show that the blending of the two polymers creates a better substrate for cell growth in comparison with pure components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058570
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A new process for the production of bone cement by gelled suspension polymerization of MMA (1994)
    Springer
    Journal of materials science 5 (1994), S. 858-861 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract A new suspension polymerization process, utilizing a water-agarose gel as suspending phase, is described. In the early stage of the process, the monomer is dispersed in the water-agarose solution by adequate stirring, then the solution gelifies and polymerization starts. By this technique, PMMA powders adequate for bone cement production were obtained. Several tests were performed on the polymer obtained in order to determine its basic physicochemical properties: viscometric tests, GPC tests, DSC tests, granulometric distribution analysis and SEM analysis. The measured properties show that the material obtained can be satisfactorily compared with the existing commercial powders for bone cements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172025
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    Paper (German National Licenses)
    Fulltext
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