Results 231 to 240 of about 516,228 (283)
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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 ...
R P, Kusy, D T, Turner
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The initiation of polymerization of methyl methacrylate by the poly(methyl methacrylate) anion
Journal of Polymer Science, 1960AbstractAddition of methyl methacrylate monomer to poly(methyl methacrylate) which has been polymerized with fluorenyllithium or sodium‐naphthalene in tetrahydrofuran at −78°C. produces high conversion of monomer to polymer. By a comparison of the number‐average molecular weights before and after the addition of the second monomer, it is demonstrated ...
Roger K. Graham +2 more
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Hepatotoxicity by methyl methacrylate
Clinics and Research in Hepatology and Gastroenterology, 2021Cristiano, Brauner +2 more
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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 ...
V, Kassis, P, Vedel, E, Darre
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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.
A M, Rijke, R A, Johnson, E R, Oser
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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.
J. 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.
J. Spěváček +3 more
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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.
J A, Corkill +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.
J A, Corkill +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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Polarographic determination of methyl methacrylate
Talanta, 1967The permanganate oxidation of methyl methacrylate in weakly acidic solution yields methyl pyruvate. Hydroxylamine hydrochloride is used for destroying the excess of permanganate. At the same time it is consumed for oximation of the pyruvate, and the resulting oxime is determined polarographically. The reaction scheme of permanganate oxidation of methyl
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Green Solvents for Polymerization of Methyl Methacrylate to Poly(Methyl Methacrylate)
2012Solvents are often volatile organic compounds (VOCs) and are therefore a major environmental concern as they are able to form low-level ozone and smog. Due to the increase in environmental awareness, it is a matter of great concern for scientists to decrease the consumption of VOCs.
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