Results 261 to 270 of about 46,542 (308)

Poly(methyl methacrylate) membranes

Journal of Applied Polymer Science, 1978
AbstractUniform and symmetric membranes were formed from poly(methyl methacrylate) (PMMA) by making use of the stereocomplex phenomenon which characteristically occurs in the solution of a mixture of isotactic PMMA and syndiotactic PMMA. The water permeability of the membrane was very high compared to a commercially available cellulosic membrane ...
Yoshitada Sakai, Hiroshi Tanzawa
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Poly(methyl methacrylate)

2009
Abstract Special Properties Optically clear (92% transmission, theoretical limit for normal incidence, in the visible region) through the visible wavelength range; very little ultra-violet absorption until 260 nm. Major Applications Replacement for glass. Good mechanical properties. Can be used in various biomedical applications.
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Methyl methacrylate in poly(methyl methacrylate)—validation of direct injection gas chromatography

Journal of Chromatography A, 2004
Gas 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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The limits of linear viscoelasticity in poly(methyl methacrylate) and poly(ethyl methacrylate)

Journal of Applied Polymer Science, 1975
AbstractThe limit of linear viscoelasticity is determined for poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA) in uniaxial tension creep over the temperature range of 20° to Tg −10°C. The time span covered is from 10 to 1000 sec. The linear limit is defined as the point at which the creep compliance deviates by more than 1% from its
Hans Bertilsson, Jan‐Fredrik Jansson
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13C NMR spectra of poly(methyl methacrylate) and poly(ethyl methacrylate)

Journal of Molecular Structure, 1984
Abstract Assignments are proposed for the CHCl 3 solution 13 C NMR spectra of isotactic, syndiotactic and D 5 -chain deuterated poly(methyl methacrylate) and poly(ethyl methacrylate). A possible conformational explanation is offerred to account for the doubling of the isotactic poly(methyl methacrylate) backbone methylene and α-methyl carbon ...
Anton Neppel, Ian S. Butler
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Characterization of poly(methyl methacrylate) during the thermal polymerization of methyl methacrylate

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 ...
Ben Chu, Day Chyuan Lee
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Photodegradation of poly(methyl methacrylate)

Journal of Polymer Science Part A-1: Polymer Chemistry, 1966
AbstractThe vacuum photodegradation at 30°C. of poly(methyl methacrylate) and copolymers with acrylaldehyde, methacrylaldehyde, and methyl acrylate has been studied. The polymers were examined in the form of expanded films as produced by a freeze‐drying technique. At least one molecule of carbon monoxide is evolved for each chain scission.
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Green Solvents for Polymerization of Methyl Methacrylate to Poly(Methyl Methacrylate)

2012
Solvents 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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Radical polymerization of methyl methacrylate in the presence of isotactic poly(methyl methacrylate)

Journal of Polymer Science Part A-1: Polymer Chemistry, 1972
AbstractMethyl 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.
R. Buter, Y. Y. Tan, G. Challa
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In Vitro Studies of Poly(methyl Methacrylate) Adjuvants

Journal of Pharmaceutical Sciences, 1976
Poly(methyl methacrylate) adjuvants, prepared by polymerizing monomeric methyl methacrylate in the presence of influenza virions or by addition of the virions to previously polymerized poly(methyl methacrylate) particles, were studied by means of the hemagglutination test, antibody binding, and electron microscopy.
J, Kreuter, P P, Speiser
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