화학공학소재연구정보센터
Journal of Polymer Science Part B: Polymer Physics, Vol.48, No.12, 1336-1348, 2010
Spectroscopic and Photopolymerization Studies of Benzyl Methacrylate/Poly(benzyl methacrylate) Two-Component System
The influence of the viscosity of a two-component system on its molecular dynamics (on the basis of hypersonic wave velocity and attenuation coefficient) and photopolymerization kinetics was studied. The system investigated represented the solution of poly(benzyl methacrylate), PBzMA (MW = 70000) in its monomer, benzyl methacrylate (BzMA). The viscosity of the system was varied by adding various amounts of the polymer to the monomer (10-50 wt %). The molecular dynamics in the neat BzMA was studied by the proton Nuclear Magnetic Resonance (NMR) spin-lattice relaxation time measurements and the wide-line H-1 NMR spectroscopy in a wide range of temperature. Information on the local dynamics in liquid BzMA above its melting temperature was gained from the high-resolution H-1 and C-13 NMR spectra. The hypersonic wave velocity and the attenuation coefficient were investigated in the appropriate temperature range related to a viscoelastic relaxation process by the Brillouin light scattering method. The kinetic measurements have demonstrated that the photopolymerization rate rapidly increases and the monomer conversion decreases with increasing polymer-to-monomer ratio; this effect has been noted in the whole range of polymer concentration and reaction temperature studied. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1336-1348, 2010