24 595 5 854 231 62 15 689 4 844 690 73 20 310 2 878 725 5______________________________________ as can be seen sample 1 which contains the copolymer additive has a higher flexural strength than a sample filled with atomite or that of an unfilled sample effect of the allyl content of the copolymers on the heat distortion temperature of molded polyester resins in which they are used the copolymers were prepared by solution polymerization in toluene a three neck round bottom flask equipped with nitrogen bleed reflux condenser and thermometer was immersed in an oil bath maintained at 71 u00b0 c three separate polymerizations were performed using the following charges ______________________________________ 1 2 3 ______________________________________toluene ml 3400 3400 3400allyl methacrylate ama g 57 283 3methyl methacrylate mma g 566 6 510 283 3t butyl peroxypivalate g 141 65 141 65 141 65______________________________________ used as a 75 solution in mineral spirits lupersol 11m75 lucidol division pennwalt corporation each polymerization was continued for 41 2 hours under continuous passage of nitrogen the maximum exotherms were around 90 u00b0 c at the end of the polymerization the toluene solution of the polymer was concentrated on a rotary evaporator before precipitation from heptane the precipitated polymers were vacuum dried overnight ______________________________________ocf e 701 160 gcopolymer 40 gatomite 160 g2 5 dimethyl 2 5 bis 2 ethyl hexanoyl 1 6 gperoxy hexane______________________________________ using this basic formulations for each of the copolymers bars 5 34 u00d7 0 5 34.