the synthesis of optical resin is to melt diene a at 80-90 ℃, add ditert-butyl peroxide or dicumyl peroxide with a mass ratio of 0.1%, mix and evenly inject into a mold, solidify at 75-80 ℃ for 5h,100 ℃ for 2h,140 ℃ for 2h, naturally cool down, and demold to obtain transparent samples.
The synthesis of diene A, styrene copolymer and 90% diene A content copolymer is the same as the above diene A homopolymerization method. The copolymer in other proportions is synthesized by dissolving the expected amount of diene A and azodiisobutyronitrile with a mass ratio of 0.1%-0.2% in styrene, filtering, prepolymerizing to a certain viscosity at 85-90 ℃, injecting into a mold, curing at 45-50 ℃ for 10h, curing at 75-80 ℃, transparent sample is obtained after demoulding.