Suspension polymerization as you are well aware relies on effectively polymerizing a monomer within an aqueous phase to provide a range of discrete particle (sized) distributions.  With respect to MW, unless a living methodology is employed, the PDI of the suspension system will be at least 1.6+ and Mn ~ 100K+ may be obtainable under the following suggested set of conditions: 1.0% PVP stabilizer and 1.5% benzoyl peroxide initiator.  Clearly, however, the mechanics of the addition of the stabilizer, temperature profile, and time of reaction all play interactive roles in the final bead development and correlated Mn.  I suggest contacting Machado (a fellow Researchgater) whose work in this area may be of utility in giving you an opportunity to develop your own formulation for what you wish to achieve.  Please see accompanying link.

Article METHYL METHACRYLATE SUSPENSION POLYMERIZATION: STRATEGIES ON...

Dr. Lucian has given the answer. I like to add you can try AIBN also. If you want  water soluble catalyst, use potassium persulphate or ammonium persulfate below or near 60 degreeC.

Thanks for all answer...

Thank you