AbstractPolymerizations of 2,4,6‐tribromophenyl methacrylate (1a),p‐tolyl methacrylate (1b),p‐cyclohexylphenyl methacrylate (1c), andp‐methoxyphenyl methacrylate (1d) were carried out up to conversions higher than 99%. The kinetics of the process was followed by the refractometric technique using a He‐Ne laser as light source. The influence of the concentration of initiator on the appearing of the gel effect was examined, taking the polymerization of1aas a