Results 261 to 270 of about 53,659 (312)
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Contact dermatitis to methyl methacrylate
Contact Dermatitis, 19842 cases of contact dermatitis to methyl methacrylate monomer are presented. The patients are nurses who mixed bone cement at orthopedic operations. During the procedure, they used 2 pairs of gloves (latex). Butyl rubber gloves are recommended for methyl methacrylate monomer to avoid sensitization and/or cumulative irritant contact dermatitis on the ...
Vibeke Kassis, Erik Darre, Peter Vedel
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Fractography of poly(methyl methacrylates)
Journal of Biomedical Materials Research, 1975AbstractFor convenience in clinical manipulation, it is the practice to fabricate PMMA prostheses from mixtures of powder and monomer. When the monomer is subsequently polymerized an unusual 2‐phase polymeric material results in which grains of PMMA are dispersed in a matrix of the same polymer.The mechanical properties of the 2‐phase materials are ...
D. T. Turner, Robert P. Kusy
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European Polymer Journal, 1977
Abstract The temperature dependence of chemical shifts in 1 H-NMR spectra of solutions of methyl methacrylate (MMA) in various solvents revealed specific interaction of MMA molecules with dimethylformamide (DMF). In the system MMA-poly (methyl methacrylate) (PMMA)-DMF, PMMA acts as a further component interacting with MMA.
Jiří Spěváček +3 more
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Abstract The temperature dependence of chemical shifts in 1 H-NMR spectra of solutions of methyl methacrylate (MMA) in various solvents revealed specific interaction of MMA molecules with dimethylformamide (DMF). In the system MMA-poly (methyl methacrylate) (PMMA)-DMF, PMMA acts as a further component interacting with MMA.
Jiří Spěváček +3 more
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On the fate of methyl methacrylate in blood
Journal of Biomedical Materials Research, 1977AbstractThe fate of methyl methacrylate in fresh human blood was investigated in vitro by using gas chromatography. It was found that methyl methacrylate is present in cells in concentrations twice as large as in plasma, but it disappears exponentially with time at a rate that is at least 10 times faster than that in cells.
Arie M. Rijke, R. A. Johnson, E. R. Oser
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Radical polymerization of methyl methacrylate in the presence of isotactic poly(methyl methacrylate)
Journal of Polymer Science Part A-1: Polymer Chemistry, 1972AbstractMethyl methacrylate (MMA) was polymerized by radical initiation at 25°C in DMF in the presence of preformed isotactic PMMA (iMA) with about 90% isotactic triads and different M̄v's, viz., iMA‐1: 7.2 × 105; iMA‐2, 5.0 × 105; iMA‐3, 3.5 × 105; iMA‐4, 1.25 × 105; and iMA‐5, 1.15 × 105. The MMA:iMA ratio was 6:1.
Y. Y. Tan, Ger Challa, R. Buter
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Macromolecules, 1984
Etude des proprietes dynamiques et statiques du polymere forme en fonction de la masse moleculaire du second coefficient du viriel du rayon de giration, du coefficient de diffusion translationnelle et de l'equivalent correspondant du rayon ...
Day Chyuan Lee, Ben Chu
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Etude des proprietes dynamiques et statiques du polymere forme en fonction de la masse moleculaire du second coefficient du viriel du rayon de giration, du coefficient de diffusion translationnelle et de l'equivalent correspondant du rayon ...
Day Chyuan Lee, Ben Chu
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Journal of Polymer Science: Polymer Symposia, 1976
AbstractWe have re‐examined the copolymerization of methyl methacrylate (MMA) and styrene in the presence of triethylaluminium at 273°K under visible light following recent claims that it was an alternating system. We applied gel‐permeation chromatography to establish that the polymers had monomodal distributions and could be regarded as coherent ...
C. Mair +4 more
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AbstractWe have re‐examined the copolymerization of methyl methacrylate (MMA) and styrene in the presence of triethylaluminium at 273°K under visible light following recent claims that it was an alternating system. We applied gel‐permeation chromatography to establish that the polymers had monomodal distributions and could be regarded as coherent ...
C. Mair +4 more
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Methyl Methacrylate Restrictions
JAMA: The Journal of the American Medical Association, 1974To the Editor.— I believe that a protest must be made regarding the position and actions taken by the Food and Drug Administration (FDA) in relationship to the use of methyl methacrylate. I think there is justification for the FDA to evaluate new and experimental drugs and to control these drugs in relationship to the toxicity and possible harm that ...
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Clinica Chimica Acta, 1976
1. The rate of disappearance of methyl methacrylate in blood has been determined using an isotope dilution technique. 2. At a concentration of 10(-4) mol dm(-3), methyl methacrylate disappears with pseudo first order kinetics. 3. The half-life of methyl methacrylate in blood at 37 degrees C lies in the range 20--40 min. 4.
P. Hoyle +6 more
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1. The rate of disappearance of methyl methacrylate in blood has been determined using an isotope dilution technique. 2. At a concentration of 10(-4) mol dm(-3), methyl methacrylate disappears with pseudo first order kinetics. 3. The half-life of methyl methacrylate in blood at 37 degrees C lies in the range 20--40 min. 4.
P. Hoyle +6 more
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Methyl methacrylate in poly(methyl methacrylate)—validation of direct injection gas chromatography
Journal of Chromatography A, 2004Gas chromatography (GC) was investigated for the determination of residual methyl methacrylate (MMA) in heat-processed poly(methyl methacrylate) (PMMA) denture base material emphasizing recovery and validation. Standard solutions of MMA and emulsion-polymerized PMMA in dichloromethane were analysed, before and after distillation by a room-temperature ...
Christie Y.K. Lung, Brian W. Darvell
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