ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effect of tricalcium phosphate, hydroxyethyl methacrylate, and ethylene glycol dimethacrylate on the mechanical properties of acrylic bone cement (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 245 (1997), S. 49-62 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß einer Beimischung von Tricalciumphosphat (TCP), Hydroxyethylmethacrylat (HEMA) und Ethylenglycoldimethacrylat (EGDMA) auf die Eigenschaften eines chirurgischen Knochenzements wurde untersucht. Die in Zugversuchen entstandenen Bruchflächen wurden mittels Rasterelektronenmikroskopie charakterisiert. Der Einfluß der Additive auf den Temperaturanstieg während der Polymerisation wurde geprüft. Zug-, Biege- und Druckfestigkeit des ausgehärteten Zements nahmen mit zunehmendem TCP-Gehalt ab, der Elastizitätsmodul stieg dagegen an. Die Zugfestigkeit nahm mit steigendem HEMA-Gehalt geringfügig zu und blieb oberhalb 15 Gew.-% HEMA konstant. Zug-, Biege- und Druckfestigkeit zeigten bei einem EGDMA-Gehalt von 2 Gew.-% (in HEMA) ein Maximum. HEMA und EGDMA beschleunigten die Polymerisation, wogegen TCP retardierend wirkte.
    Notes: The effects of the addition of tricalcium phosphate (TCP), hydroxyethyl methacrylate (HEMA), and ethylene glycol dimethacrylate (EGDMA) on the properties of standard surgical Simplex-P radiopaque bone cement have been investigated. The fracture surface after tensile test was studied by scanning electron microscopy. The influence of these components on the temperature rise during polymerization was investigated. It was found that the tensile strength, the bending strength, and the compressive strength decreased with increasing TCP content, whereas the inverse was observed for the Young's modulus. The tensile strength slightly increased with increasing HEMA content and then it levelled off when the HEMA content was higher than 15 wt.-%. It seemed that there were maximum tensile, bending and compressive strengths when 2 wt.-% EGDMA (in HEMA) was added. Polymerization occurred more rapidly when HEMA and EGDMA were added, whereas the inverse result was found with TCP.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052450105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Organic-inorganic hybrid sol-gel materials, 2. Application for dental composites (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 251 (1997), S. 61-72 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Drie organisch-anorganische Hybridmaterialien wurden nach dem Sol-Gel-Verfahren durch kovalenten Einbau von Poly(styrol-co-methylmethacrylat)(Poly(St-co-MMA))-, Polymethylmethacrylat(PMMA)- und Polystyrol(PS)-Struktureinheiten in ein SiO2-Netzwerk hergestellt und als Füllstoffe (bis zu 60 Gew.-%) in Dentalharzen verwendet. Der Einfluß der Füllstoffe auf einige mechanische Eigenschaften der Harze wurde untersucht. Die Härte der gefüllten Dentalharze nahm mit steigendem Füllstoffgehalt zu, wogegen die Biegefestigkeit abnahm. Die Druckfestigkeit der gefüllten Harze war besser als die des ungefüllten Harzes, nahm jedoch mit steigendem Füllstoffgehalt ab.
    Notes: By incorporating poly(methyl methacrylate) (PMMA), polystyrene (PS), and poly(styrene-co-methyl methacrylate) (poly(St-co-MMA)) structure units covalently into the SiO2 glass network via a sol-gel approach, three organic-inorganic hybrid materials (PMMA-SiO2, PS - SiO2, and poly(St-co-MMA) - SiO2) have been prepared. The three hybrid sol-gel materials were used as filler (up to 60 wt.-%) for dental composite resins. The effect of the three filler materials on several mechanical properties of the dental composite resins was investigated. The hardness of the filled dental composites increased with increasing filler content, whereas the bending strength decreased. The compressive strength of the composites was improved, compared with the unfilled resin, but decreased with inreasing filler content.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052510106
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Model reactions of pyridinecarboxylic acids with glycidyl phenyl ether (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 999-1011 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The reactions of 3-pyridinecarboxylic acid (nicotinic acid, NA) and 4-pyridinecarboxylic acid (isonicotinic acid, ISNA) with 2,3-epoxypropyl phenyl either (glycidyl phenyl ether, GPE) were studied by means of high performance liquid chromatography (HPLC). It is found that both reactions involve two-step mechanisms and have induction periods. Two products, pyridinium salt and ester, are obtained in each study. The formation of pyridinium salt is the cause of the occurrence of the induction period. After the induction period, the kinetics of the reaction is second order. Pyridinium ions do not form complexes with carboxylate ions of pyridinecarboxylates but form activated complexes with the hydrogen-bonded complexes of pyridinecarboxylic acids and GPE to activate the esterification reactions. The mechanisms of the reactions are discussed in detail.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910502
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Study of heterocyclic polymers, 2.Part 1: cf.1. Model reactions of 2-pyridinecarboxylic acid with glycidyl phenyl ether (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 3121-3130 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The reaction of 2-pyridinecarboxylic acid (picolinic acid, PA) with 2,3-epoxypropyl phenyl ether (glycidyl phenyl ether, GPE) was studied by means of high performance liquid chromatography (HPLC). It was found that the reaction between PA and GPE is quite different from that between nicotinic acid (NA) or isonicotinic acid (ISNA) and GPE, and does not obey the kinetics of second or other order; hence the rate constant of the reaction cannot be obtained. The reaction may be described by a three-step mechanism. PA reacts first with GPE to yield N-(2-hydroxy-3-phenoxypropyl)pyridinium-2-carboxylate (PA-1). PA-1 is then decarboxylated to form an ylide. The ylide reacts immediately with PA to yield N-(2-hydroxy-3-phenoxypropyl)pyridinium picolinate (NPP). NPP subsequently catalyzes the reaction between PA and GPE, with 2-hydroxy-3-phenoxypropyl picolinate (PA-2) as a product. Because the concentration of NPP increases with time, the rate of reaction between PA and GPE is increasing with time. The mechanism of the reaction is discussed in detail.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911231
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Study of heterocyclic polymers, 3Part 2: cf.1.. Synthesis and properties of the ampholytic heteroccylic polyelectrolyte poly[n-(2-hydroxy-3-methacryloyloxypropyl)-pyridinium-3-carboxylate] (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 999-1008 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A non-betaine type of ampholytic heterocyclic polyelectrolyte (AHP), poly[N-(2-hydroxy-3-methacryloyloxypropyl)pyridinium-3-carboxylate] [poly(NHMPPC)], was synthesized by freeradical polymerization. The turbidimetric, viscometric and potentiometric properties of the polymer were studied in aqueous solution. It exhibits good salt tolerance in CaCl2 up to 100°C and a viscositiy behavior in aqueous alkali salt and hydrochloride solutions different from that of usual polyelectrolytes. The potentiometric behavior revealed that the polymer does not undergo a conformational transition during acidification and that the electrostatic repulsion along the chain is low. The polymer main chain forms compact hydrophobic areas in concentrated HCl solution, whereas in concentrated NaCl solution it extends to a more straight form.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920422
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Organic-inorganic hybrid sol-gel materials, 1. Preparation and characterization (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 251 (1997), S. 49-60 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Drei organisch-anorganische Hybridmaterialien wurden nach dem Sol-Gel-Verfahren durch kovalenten Einbau von Poly(styrol-co-methylmethacrylat)(Poly(St-co-MMA))-, Polymethylmethacrylat(PMMA)- und Polystyrol(PS)-Struktureinheiten in ein SiO2-Netzwerk hergestellt. Die radikalische Polymerisation von Styrol und/oder Methylmethacrylat mit 3-(Trimethoxysilyl)propylmethacrylat (MSMA) lieferte die drei Polymervorstufen Poly(St-co-MMA-co-MSMA) (Molverhältnis St/MMA/ MSMA = 30/48/22), Poly(MMA-co-MSMA) (Molverhaltnis MMAMSMA = 76/24) und Poly(St-co-MSMA) (Molverhaltnis St/MSMA = 69/31) mit Glasubergangstem-peraturen bei 67°C, 68°C bzw. 61°C. Diese Copolymeren wurden mittels 1H-NMR-und FTIR-Spektroskopie, GPC, Elementaranalyse, DSC und TGA untersucht. Nach Hydrolyse wurden die Copolymeren mit Tetraethylorthosilikat (TEOS) in Tetrahy- drofuran bei Raumtemperatur zu monlithischem Poly(St-co-MMA-co-MSMA)- SO2, Poly(MMA-co-MSMA)-Si02 bzw. Poly(St-co-MSMA)-Si02 mit Silikatge- halten zwischen 16 und 84 Gew.-% cokondensiert. Die thermischen Eigenschaften dieser Hybridmaterialien wurden mittels DSC und TGA untersucht.
    Notes: Three organic-inorganic hybrid materials have been prepared by incorporating poly(styrene-co-methyl methacrylate) (poly(St-co-MMA)), poly(methyl methacrylate) (PMMA), and polystyrene (PS) structure units covalently into the SiO2 glass network via the sol-gel approach. The polymer precursors were synthesized by freeradical copolymerization of styrene and/or methyl methacrylate with 3-(trimethoxysilyl)propyl methacrylate (MSMA) to obtain the poly(St-co-MMA-co-MSMA) copolymer (molar ratio St/MMA/MSMA = 30/48/22), poly(MMA-co-MSMA) copolymer (molar ratio MMA/MSMA = 76/24), and poly(St-co-MSMA) copolymer (molar ratio St/MSMA = 69/31) with glass transition temperatures at about 67°C, 68°C, and 61°C, respectively. The characteristics and properties of the copolymers were characterized by 1H NMR, Fourier-transform infrared spectroscopy (FTIR), gel-permeation chromatography (GPC), elemental analysis, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The copolymers were then hydrolysed and co-condensated with tetraethyl orthosilicate (TEOS) in tetrahydrofuran at room temperature to afford monolithic poly(St-co-MMA)—SiO2, PMMA—SiO2, and PS-SiO2 hybrid sol-gel materials having SiO2 contents of 16-84 wt.-%. The thermal properties of the hybrid materials were characterized by TGA and DSC.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052510105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Mechanical properties of acrylic bone cement containing PMMA-SiO2 hybrid sol-gel material (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 38 (1997), S. 143-154 
    Details
    ISSN: 0021-9304
    Keywords: sol-gel ; PMMA-SiO2 hybrid material ; bone cement ; tricalcium phosphate ; hydroxyethyl methacrylate ; ethylene glycol dimethacrylate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: An organic-inorganic hybrid material, poly(methyl methacrylate) (PMMA)-SiO2 (SiO2 content of 72 wt%), was prepared by incorporating PMMA structure units covalently into an SiO2 glass network via the sol-gel approach. The hybrid sol-gel material PMMA-SiO2 was subsequently used as the solid powder component of bone cement and its mechanical properties were evaluated. The effects of the addition of tricalcium phosphate (TCP), hydroxyethyl methacrylate (HEMA), and ethylene glycol dimethacrylate (EGDMA) on the properties of the sol-gel hybrid bone cement were also investigated. The influence of these components on the temperature rise during polymerization was discussed. It was found that the new bone cement containing PMMA-SiO2, hybrid sol-gel material had higher modulus than that of Simplex®-P bone cement. The addition of TCP in the new bone cement increased the Young's modulus and the polymerization time; the inverse was observed for the tensile, bending, and compressive strengths, and the polymerization temperature. The addition of HEMA and EGDMA in the new bone cement had the opposite effect of TCP. The comparison between the new sol-gel bone cement and the commercial Simplex P bone cement was discussed. © 1997 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 38: 143-154, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    The effect of trimellitic acid on the thermal properties of polyester coating powder (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 20 (1982), S. 611-614 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.130201201
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    facet.materialart.
    Unknown
    Model reaction of epoxy-containing siloxane (1996)
    Elsevier
    Details
    Publication Date: 1996-12-01
    Print ISSN: 0022-3093
    Electronic ISSN: 1873-4812
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Cationic Polymerization of cis-2,3-Tetramethylene-1,4,6-trioxaspiro[4,4]nonane Photosensitized by Anthracene (2010)
    American Chemical Society
    Details
    Publication Date: 2010-10-04
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...