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  • 1
    Electronic Resource
    Electronic Resource
    Complexation of polymeric drugs based on polyacrylic chains with aminosalicylic acid side groups (1997)
    Springer
    Journal of materials science 8 (1997), S. 743-746 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Polymeric drugs and ionomers can exhibit properties associated with the polymeric nature, such as adhesion, or coating of different substrates by polymeric active films, and can be applied successfully in the field of biomaterials. In this sense, complexation with calcium ions of two polyacrylic systems derived from 4-aminosalicylic acid (poly (4-HMA)), and 5-aminosalicylic acid, (poly (5-HMA)), have been studied by Fourier transform–infrared spectroscopy and thermogravimetric analysis. Both techniques support the ability of these polymers to form complexes with calcium ions as polycarboxylates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018504410878
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical properties of a modified acrylic bone cement with etoxytriethyleneglycol monomethacrylate (1995)
    Springer
    Journal of materials science 6 (1995), S. 793-798 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: With the aim of improving some of the disadvantages of the acrylic bone cements, an acrylic bone cement based on polymethyl methacrylate has been modified by substituting different quantities, up to 20%, of the monomer methyl methacrylate (MMA) with the same amount of ethoxytriethyleneglycol monomethacrylate (TEG). The addition of this new monomer decreased noticeably the maximum temperature and increased both setting and working times. Mechanical testing revealed that the introduction of TEG gave rise to a less fragile bone cement by increasing slightly the total deformation without any change in the rest of the tensile parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134319
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between the morphology of PMMA particles and properties of acrylic bone cements (1996)
    Springer
    Journal of materials science 7 (1996), S. 375-379 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Bone cements are mainly based on acrylie polymers, poly (methyl methacrylate) (PMMA) being the most representative. The curing process (cold curing) is the result of the free radical polymerization of a mixture of beads of PMMA and methyl methacrylate (MMA), initiated by benzoyl peroxide (BPO) and activated by the presence of a tertiary amine, the most classical being N,N-dimethyl-4-toluidine (DMT). In this work the results on the effect of the size and size distribution of PMMA beads and the concentration of DMT and BPO on the setting parameters, the residual monomer content and the mechanical properties (tension and compression) of the cured systems are presented. The use of relatively larger diameter PMMA beads improves the characteristic parameters of the curing process (decreasing the peak temperature and increasing the setting time), without detrimental effects on the mechanical properties of the cured cement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154553
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  • 4
    Electronic Resource
    Electronic Resource
    Natriuresis after water loading in rats bearing transplants of pars intermedia (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 682-683 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary After water loading, rats bearing ocular grafts of the pars intermedia of the pituitary showed that the content of sodium increased in urine, whereas potassium excretion and diuresis did not vary significatively. These results suggest that in the rat the pars intermedia is involved in the regulation of the electrolyte metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946574
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  • 5
    Electronic Resource
    Electronic Resource
    Radical polymerization in the presence of complexing agents. II. Copolymerization of methyl methacrylate-allyl methacrylate in the presence of zinc chloride (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 62 (1977), S. 91-99 
    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: Die radikalische Copolymerisation von Methylmethacrylat (MMA) und Allylmethacrylat (AMA) wurde studiert. Die Reaktionen wurden mit Azoisobutyronitril (AIBN) in Anwesenheit von ZnCl2 initiiert. Mit zunehmender ZnCl2-Konzentration nimmt die Copolymerisationsgeschwindigkeit zu, und die Copolymerisationsparameter bleiben nicht konstant. MMA und AMA bilden EDA-Komplexe mit ZnCl2. Diese Komplexbildung erklärt unsere Ergebnisse.
    Notes: Radical copolymerization of methyl methacrylate (MMA)-allyl methacrylate (AMA) in the presence of zinc chloride, using azoisobutyronitrile (AIBN) as initiator has been carried out. The copolymerization rate increases with the concentration of ZnCl2 and the reactivity ratios are modified by the concentration of ZnCl2 which is explained by the different tendency towards the formation of complexes between MMA and AMA with ZnCl2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050620108
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  • 6
    Electronic Resource
    Electronic Resource
    Microstructure and tacticity in radical copolymerization IIcf. Part I, Angew. Makromol. Chem. 78 (1979) 129. Stereochemical configuration of styrene-methyl methacrylate copolymers synthesized in solution (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 86 (1980), S. 1-16 
    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: Die Zusammensetzung und stereochemische Konfiguration von Methylmethacrylat- Styrol-Copolymeren, die in Benzol, Chlorbenzol und Benzonitril hergstellt wurden, wurde mit Hilfe der 1H-NMR Spektroskopie bestimmt. Die Fraktionen, deren Triaden eine zentrale Methylmethacrylateinheit in den Copolymeren haben, wurden aufgrund der schon früher berichteten Zuordnung der Methoxysignale berechnet. Aufgrund der gefundenen Ergebnisse beeinflußt die Änderung der Polarität des Lösungsmittels nicht nur die kinetischen Parameter, sondern auch die Zusammensetzung und die stereochemische Konfiguration der Sequenzen in den Copolymeren.
    Notes: The composition and stereochemical configuration of methyl methacrylate-styrene copolymers obtained in benzene, chlorobenzene and benzonitrile has been evaluated by 1H-NMR spectroscopy. The methyl methacrylate centered triad fractions in the copolymers have been calculated on the basis of the previously reported methoxy signal assignments. The results obtained are discussed taking into consideration the variation in the polarity of solvents; they make it possible to state that the presence of solvents not only affects the kinetic parameters but also changes the composition and the stereochemical configuration of monomer sequences in the copolymers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050860101
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure and tacticity in radical copolymerization IIIcf. Part II, Angew. Makromol. Chem. 86 (1980) 1. Stereochemical configuration of styrene-methyl methacrylate copolymers synthesized by suspension polymerization (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 86 (1980), S. 17-31 
    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: Die Zusammensetzung und stereochemische Konfiguration von Styrol-Methylmethacrylat Copolymeren, die durch Polymerisation bis zu vollständigem Umsatz hergestellt worden sind, wurden mit Hilfe der 1H-NMR-Spektroskopie ermittelt. Die erhaltenen Ergebnisse wurden mit jenen verglichen, die bei der Copolymerisation in Substanz bei niedrigem Umsatz gefunden wurden. Daraus ist zu erkennen, daß bis zu einem gewissen Ausmaß die Gesamtzusammensetzung und noch stärker der Gehalt an taktischen Sequenzen der Copolymeren vom Umsatz abhängen.
    Notes: The composition and stereochemical configuration of styrene-methyl methacrylate copolymers synthesized by total conversion polymerization have been evaluated by 1H-NMR spectroscopy. The results obtained are discussed and compared with those obtained at low conversion bulk copolymerization. They make it possible to state that the conversion affects to some extent the overall composition of the copolymers and more drastically, the content of tactic sequences in the copolymers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050860102
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure and tacticity in radical copolymerization I. (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 78 (1979), S. 129-143 
    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: Die NMR-Spektren von Styrol-Methylmethacrylat-Copolymeren zeigen eine Reihe von Peaks im 2,0-3,6δ Resonanzbereich, die charakteristisch für die Methoxygruppe sind. Diese Peaks erklären sich durch die Abschirmung der Methoxy-Protonen in Abhängigkeit von Zahl und Konfiguration der benachbarten Styroleinheiten in der Polymerkette. Die Intensitäten der Methoxysignale werden mit statistischen Untersuchungen der Monomersequenzverteilung verglichen.
    Notes: The NMR spectra of styrene-methyl methacrylate copolymers were found to exhibit a multiplicity in the 2.0-3.6δ region characteristic for methoxy protons. The methoxy pattern is explained by taking into account the degree of shielding of methoxy protons, in relation to both number and configuration of the neighbouring styrene units along the chain. The relative areas of the methoxy peaks are compared with results of the statistical analysis of monomer sequence probabilities.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050780110
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  • 9
    Electronic Resource
    Electronic Resource
    Radical polymerization in the presence of complexing agents. III. Effect of low concentrations of ZnCl2 on the radical polymerization of methyl methacrylate (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 1101-1108 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of complexes between ZnCl2 and methyl methacrylate (MMA) or between ZnCl2 and AIBN was tested at two different polymerization temperatures, taking into account the Haeringer and Riess treatment. For any concentration of ZnCl2 between 0.01 and 0.1 mole/liter the formation of ZnCl2-MMA complexes is favored, whereas AIBN-ZnCl2 complexes are hardly showed. The effect of zinc chloride on the stereostructure of poly(methyl methacrylate) was also investigated at both temperatures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190507
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  • 10
    Electronic Resource
    Electronic Resource
    Radical polymerization in the presence of complexing agents. VI. Effect of low concentrations of ZnCl2 on the overall rate of copolymerization of methyl methacrylate with ethyl acrylate (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2749-2754 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Overall rates for the free-radical copolymerization of methyl methacrylate with ethyl acrylate in the presence of low concentrations of ZnCl2 have been determined at 50°C. The rate of copolymerization Rp depends on both the ZnCl2 concentration and the monomer feed composition. Relative copolymerization rates Rp/R0p where R0p is the rate of copolymerization in the absence of complexing agent in the reaction mixture, show a minimum for intermediate feed compositions, independently of the ZnCl2 concentration. On the basis of the results obtained, a conventional copolymerization mechanism is proposed for this system in which free and complexed species of both acrylic monomers participate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210912
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