Results 271 to 280 of about 53,659 (312)

Dendrimer/methyl methacrylate co-polymers: residual methyl methacrylate and degree of conversion

Journal of Biomaterials Science, Polymer Edition, 2005
Dendrimer/methyl methacrylate co-polymers were studied for use in dental composites. The aim was to determine the effects of methyl methacrylate concentration in the resin mixture and polymerization method on the degree of conversion and residual monomer content of the copolymers.
Pekka K. Vallittu, Mikael Skrifvars, Eeva Viljanen   +2 more
openaire   +3 more sources

The structure of poly(methyl methacrylate)

Journal of Polymer Science: Polymer Letters Edition, 1978
n this short communication the authors discuss the molecular structure of isotactic PMMA in the light of recently published statement by Japanese researchers that this structure consists of two essentially trans-chains forming a double helix. A brief argument against this state is concluded with an opinion that the structure of isotactic PMMA should be
V. M. Coiro, A. M. Liquori, DE SANTIS, Pasquale, L. Mazzarella   +3 more
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Microstructure of copolymers of methyl methacrylate with ethyl methacrylate

European Polymer Journal, 1988
Abstract The reactivity ratios for the copolymerization of methyl and ethyl methacrylates were calculated by the method of Kelen and Tudos. The triad sequence distributions were then determined by means of a computer program due to Harwood. The calculated distributions agree well with those found by 13 C- 1 H-NMR spectroscopy.
G.S. Kapur, Ajaib Singh Brar, S.K. Dubey
openaire   +2 more sources

Copolymerization of methyl methacrylate and urethane methacrylate—II

European Polymer Journal, 1992
Abstract A methacrylate monomer (MAUN) having a pendant urethane linkage was prepared by reacting tolylene diisocyanate (TDI), 2-naphthol and 2-hydroxyethyl methacrylate (HEMA). Photopolymerization in the absence of photosensitizer in the temperature range 32 to 62° was investigated using differential photocalorimetry.
Alok Kumar Tyagi, Indra K. Varma, Veena Choudhary   +2 more
openaire   +2 more sources

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 Copolymerization of Fluoroalkyl Methacrylates with Methyl Methacrylate

Russian Journal of Applied Chemistry, 2005
Lauryl peroxide initiated radical copolymerization of 1,1,3-trihydroperfluoropropyl methacrylate and 1,1,5-trihydroperfluoroamyl methacrylate with methyl methacrylate was studied. The kinetic parameters of copolymerization for these systems were determined at low degrees of conversion.
A. A. Fedoseeva, E. N. Goncharov, V. I. Mel’nichenko, A. N. Shendrik, K. I. Man’ko, O. P. Bovkunenko   +5 more
openaire   +2 more sources

Hepatotoxicity by methyl methacrylate

Clinics and Research in Hepatology and Gastroenterology, 2021
Cristiano Brauner, Dvora Joveleviths, Mário Reis Álvares-da-Silva   +2 more
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Stereoregular Copolymers of Methacrylic Acid and of Methyl Methacrylate

Journal of Macromolecular Science: Part A - Chemistry, 1971
Abstract Different techniques and mechanisms of hydrolysis of isotactic, syndiotactic, and atactic PMMA are compared for over-all rates and reaction yields. A combined hydrolysis using a mixture of hydriodic and acetic acid gave the best results, and included the conservation of tacticity and size of the acid-ester copolymers obtained.
Eric Selegny, Philippe Segain
openaire   +2 more sources

Hydrolysis of methacrylic acid–methyl methacrylate copolymers

Journal of Polymer Science, 1959
AbstractSeveral copolymers of methacrylic acid and methyl methacrylate have been prepared with acid contents of 28.8, 50, 60, 66, 72, 83, and 86.5%; they have been hydrolyzed in acidic medium at 110°C. at different neutralization ratios r = [HA]/[A‐].
W. De Loecker, G. Smets
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Polarographic determination of methyl methacrylate

Talanta, 1967
The 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
openaire   +3 more sources