Methyl methacrylate polymerization in the presence of C60 (C70) and molecular characteristics of fullerene-containing poly(methyl methacrylate) |
| |
| Authors: | M A Lopatin N P Evlampieva T I Lopatina Yu L Kuznetsova P N Lavrenko |
| |
| Institution: | (1) Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhnii Novgorod, Russia;(2) Fock Research Institute of Physics, St. Petersburg State University, ul. Ul’yanovskaya 1, St. Petersburg, 198504, Russia;(3) Lobachevskii Nizhegorodskii State University, Nizhnii Novgorod, Russia;(4) Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia |
| |
| Abstract: | Kinetics was studied of bulk polymerization of methyl methacrylate initiated by dicyclohexyl peroxydicarbonate in the presence of tri-n-butylborane and fullerene C60 (or C70) at variable ratio initiator: fullerene. The deceleration of the polymerization in the first stage of the reaction (below 10% conversion) was established by dilatometric method that depended on the fullerene concentration and the mode of its addition to the monomer. It was shown that at similar ratios initiator: fullerene the C60 inhibited the polymerization process considerably stronger than C70. The gel-permeation chromatography revealed the widening of the molecular weight distribution of the poly(methyl methacrylates) containing C60 or C70 compared to its analog synthesized under the same conditions without fullerene. It was established that in the fullerene-containing poly(methyl methacrylates) all the framework nanospecies are linked by covalent bonds and are mostly accumulated in the low-molecular fractions. The effect of the covalently bound fullerene on the molecular characteristics of polymers were investigated by translational isothermal diffusion, high-speed sedimentation, and viscometry |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
