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  • Articles  (29)
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  • Articles  (29)
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  • 11
    facet.materialart.
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    Influence of copolymer composition of polylactide implants on cranial bone regeneration (2006)
    Elsevier
    Details
    Publication Date: 2006-01-01
    Print ISSN: 0142-9612
    Electronic ISSN: 1878-5905
    Topics: Biology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Medicine
    Published by Elsevier
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  • 12
    facet.materialart.
    Unknown
    Effect of thermal treatment on sterility, molecular and mechanical properties of various polylactides 2. Poly(?-lactide) and poly(?-lactide) (1997)
    Elsevier
    Details
    Publication Date: 1997-02-01
    Print ISSN: 0142-9612
    Electronic ISSN: 1878-5905
    Topics: Biology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Medicine
    Published by Elsevier
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  • 13
    Electronic Resource
    Electronic Resource
    Degradable, microporous vascular prosthesis from segmented polyurethane (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 854-858 
    Details
    ISSN: 1435-1536
    Keywords: Polyurethane ; medical application ; vascular prosthesis ; degradation ; tissue regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small caliber (1.5 mm I. D.) vascular prostheses have been prepared from fractionated segmented polyurethane. The microporous and compliant prosthesis when implanted in the abdominal aorta of the rat, induced the growth of a neo-conduit, with a cellular structure similar to that of the natural artery. The process of growth of the neo-artery was accompanied by a progressive degradation of the prosthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410635
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  • 14
    Electronic Resource
    Electronic Resource
    Long-term soft tissue reaction to various polylactides and their in vivo degradation (1996)
    Springer
    Journal of materials science 7 (1996), S. 713-721 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Cylindrical pins made from poly(L-lactide), poly(L/D-lactide) 95/5% and poly(L/DL-lactide) 95/5% were implanted in the subcutaneous tissue of sheep. The tissue reaction to the implanted materials and their in vivo degradation was investigated at 1,3,6 and 12 months. The capsule formed around the polylactide implants consisted of fibroblasts, fibrocytes, phagocytes, a few foreign body giant cells and polymorphonuclear cells. For all three polylactides used, the cellular response was most intensive during the first 6 months of implantation and significantly subsided at 1 year. The thickness of the capsule was 200 μm at 1 month, increased to 200–600 μm at 6 months, and decreased to 100 to 200 μm at 1 year, depending on the material used. The tissue reaction was more intense for poly(L/D-lactide) than for poly(L/DL-lactide) and poly(L-lactide). The drop in molecular weight of the implants was highest after 1 month of implantation (70 to 95%). Irrespective of the extensive reduction of the molecular weight at 1 month, none of the polymers used was completely resorbed at 1 year. The most advanced resorption was observed for poly(L/D-lactide). Despite molecular weight reduction, the poly(L-lactide) implants had maintained 70% of their initial bending strength and 95% of their shear strength at 3 months. The poly (L/D-lactide) and poly(L/DL-lactide) had maintained only 26 to 27% of their initial bending strength and 26 to 31% of the initial shear strength, respectively. The crystallinity of all the materials increased after implantation as compared with nonimplanted materials. The overall crystallinity increase and the final crystallinity reached by the materials at 1 year was, however, lowest for poly(L/DL-lactide) as compared with the other two polylactides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00121406
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  • 15
    Electronic Resource
    Electronic Resource
    Selected topics in biomedical polyurethanes. A review (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 757-785 
    Details
    ISSN: 1435-1536
    Keywords: Biomedicalpolyurethanes ; chemistry ; structure-propertyrelations ; tissue-materialinteraction ; surfaceproperties ; biomedicaluse ; compatibilityproperties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Published literature on biomedical polyurethanes is reviewed. Selected topics concerning chemistry, structure-property relations, tissue-material interactions, surface properties, applications, processing, and sterilization, etc., are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410115
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  • 16
    Electronic Resource
    Electronic Resource
    Liquid-induced crystallization and annealing of polyester-urethane elastomers (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 323-331 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wurde die kristalline Struktur erforscht, die beim Erwärmen von segmentierten Urethanelastomeren entstanden ist. Diese Urethanelastomeren wurden vorher in mit polymeren wasserstoffbildenden Flüssigkeiten gequollen. Die Elastomere wurden bei bestimmten unveränderlichen Molverhältnis der Kettenverlängerer zum Makroglykol und bei verändertem Molverhältnis der Diisocyanate gebildet. Als Flüssigkeiten, welche die Wasserstoffbrücken bilden, wurden benutzt: Metakresol/Äthanol, Phenol/Wasser, Phenol/Äthanol, Phenol/Chloroform, DMF/Wasser, DMF/Äthanol. Als Vergleichsflüssigkeiten, die keine Wasserstoffbrücken bilden, wurden reines Chloroform und Hexadekan verwendet. Das im gequollenen Zustand aufgeheizte Polymere hatte eine sphärolitische Textur. Die Art der sphärolitischen Textur war von der Art der Wasserstoffbrücken bildenden Flüssigkeiten abhängig. Dagegen hatte der Anteil des Diisocyanates im Polymer keinen Einfluß. Beim Entstehen dieser Sphärolite wurden bestehende Wasserstoffbrücken des behandelten Original-polymers zerstört und gleichzeitig neue Brücken gebildet.
    Notes: Summary The crystalline structure formed at elevated temperature during annealing of the polyester-urethane elastomers swollen in the hydrogen-bonding liquids has been investigated. The elastomers were prepared using a constant mole ratio of chain extender and macroglycol and variable mole ratio of diisocyanate. The hydrogen-bonding liquids were solutions of meta-cresol/ethanol, phenol/water, phenol/ethanol, phenol/chloroform, DMF/water, DMF/ethanol. As the blank, nonhydrogen-bonding liquids a pure chloroform and hexadecane were used. The polymer annealed in the swollen state displayed the spherulitic texture. This spherulitic structure varied considerably with the swelling agent used, but did not depend on the diisocyanate contents in the polymer. Formation of these spherulites was accompanied with disruption and reformation of the hydrogen bonds which existed in the original polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01544325
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  • 17
    Electronic Resource
    Electronic Resource
    Polyurethane microporous membranes as pericardial substitutes (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 971-977 
    Details
    ISSN: 1435-1536
    Keywords: Polyurethanes ; polyhydroxybutyrate ; medical application ; pericardial substitute ; adhesion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Pericardial substitutes were prepared from stable and degradable segmented polyurethanes and/or polyurethane/polyhydroxybutyrate composites. Polyurethane membranes implanted as pericardial substitute in the rabbit, did not activate adhesion and epicardial reaction over 3 months. Polyurethane/polyhydroxybutyrate membranes induced minimal adhesion or epicardial reaction, yet stimulated the growth of epithelium on the polymeric substrate and reduced the incidence of infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412399
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  • 18
    Electronic Resource
    Electronic Resource
    Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 11 (polyundecaneamide) (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 811-819 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Untersucht wurden die thermischen Eigenschaften und kristallinen Strukturen des 11-Polyamid nach langfristiger Temperung mit Temperaturen nahe dem Schmelzpunkt. Getempertes 11-Polyamid bildete lamellenartige Sphärolithe und kristallisiert in alpha-Modifikation. Die Dicke der Lamellen vergrößert sich mit der Temperungszeit von 50 Å bei einer Temperungszeit von 20 Stdn. bis auf 165 Å bei einer Zeit von 2000 Stdn. Schmelzpunkt und Schmelzwärme dieser getemperten Proben erhöhen sich entsprechend von 190 °C und 10 cal/g auf 211 °C und 20 cal/g. Die extrapolierte Schmelzwärme der kristallinen Phase von 11-Polyamid beträgt 47 cal/g.
    Notes: Summary The effect of prolonged annealing at a low super-cooling on the thermal properties and crystalline structure of nylon 11 has been investigated. Annealed nylon 11 formed the lamellar spherulites of the alpha-crystalline modification. Thickness of the lamellae increased with time of annealing from 50 to 165 Å for the samples annealed for 20 and 2000 hours respectively. Corresponding values of the melting temperature and the heat of melting increased from 190 °C and 10 cal/g to 211 °C and 20 cal/g. The extrapolated heat of melting of the crystalline phase of nylon 11 is 47 cal/g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01383352
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  • 19
    Electronic Resource
    Electronic Resource
    Resorbable materials of poly(L-lactide) (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 477-484 
    Details
    ISSN: 1435-1536
    Keywords: Polylactide ; porous biomaterials ; medical application ; biodegradable surgical implants ; reservoirs for drug delivery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Poly(L-lactide) PLLA materials with various porosity in the range of 5 to 300 Μm were produced by crystallization of the polymer in presence of low molecular weight additives from solution in good solvents, followed by the diluent extraction. For the concentration of diluent in PLLA in the range of 10 to 50 per cent by weight, the pore size increased with increasing concentration of additive, while the additive was easily extracted from the polymer. For the concentration of additive in PLLA in the range of 60 to 80 per cent by weight, the pore size increased or/and decreased with increasing concentration of the additive, while the latter was hardly extractable from the polymer. Porous, resorbable tubes or rods of various diameter well accepted by living organism were produced by this method. Tracheal prostheses, pins or porous reservoirs made from PLLA or modified porous PLLA could be some of many potential application of these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419831
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  • 20
    Electronic Resource
    Electronic Resource
    Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 12 (polylaurolactam) (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1130-1136 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Thermal and crystalline behaviour of nylon 12 annealed at low supercooling for 10–2500 hours were studied by DSC, SAXS, WAXS and electron microscopy. The melting temperature and the heat of melting increased on annealing time and temperature from 174 °C and 10 cal/g to 187 °C and 23 cal/g, and at the same time the long period was enhanced from 80 to 160 Å. Long time annealing caused a partial transformation of theγ-crystal structure to theα-crystalline modification. Annealed nylon 12 consisted typical folded chain spherulites of increased latteral dimensions. The extrapolated heat of meltingΔH m * of the crystalline phase of nylon 12 in theγ-form is 50 cal/g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382456
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