Abstract
Methyl methacrylate containing finely divided silica was polymerized using various methods, the reaction being followed by measurement of the reaction exotherm. Silica was found to accelerate the polymerization in all cases. This increase in rate cannot be adequately explained by the viscosity effect alone, although some contribution from this cannot be ruled out. The accelerating effect most probably arises from stabilization of the growing polymer radicals on the silica, thus reducing the rate of radical termination reactions. Inclusion of MMA in the silica was detected but the effect is small; unequivocal evidence of grafting was not obtained. Catalytic effects due to the silica, leading possibly to an increase in the rate of propagation, are regarded as less likely but they cannot be excluded.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
