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Pseudoheterogeneous polymerization of methyl methacrylate initiated by sodium bisulfite in presence of glassy powder of PbOSiO2 by A. B. Moustafa; A. S. Badran is a Materials Science article available to read on EtoBox.

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## Abstract The aqueous polymerization of methyl methacrylate with sodium bisulfite as initiator was catalyzed by PbOSiO~2~, PbO (70 mole %)SiO~2~ (30 mole %) with a particle size < 200 mesh had the highest catalytic effect. The average molecular weight obtained in the presence of amorphous PbOSiO~2~ glass was higher than that obtained in the presence of crystalline PbO—SiO~2~ glass powder. In this system mild shaking increased the rate of polymerization. Silicon dioxide catalyzed the rate of polymerization to a higher extent than PbO, which had a slightly higher catalytic effect than lead silicate powder. The average molecular weight formed in the presence of PbO was higher than that formed in the presence of lead silicate, which in turn was higher than that formed in the presence of silicon dioxide. Increasing the initiator concentration decreased the average molecular weight. Mild shaking decreased the average molecular weight obtained when polymerization was carried out in air but increased it in a nitrogen atmosphere. Methanol decreased the conversion percentage of monomer to polymer and the average molecular weight due to its transfer reaction.

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Author

A. B. Moustafa; A. S. Badran

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley (ISSN 0360-6376)

Published

1979

Language

EN

Field

Materials Science (Physical Sciences)