Copolymerizations of Diallyl Terephthalate with Isophthalate and Allyl Benzoatet

Abstract

Diallyl isophthalate (DAI) and diallyl terephthalate (DAI) were copolymerized with allyl benzoate (ABz) in bulk at 60°C, using benzoyl peroxide as an initiator.
In both copolymerization systems the rate of polymerization and the degree of polymerization of the copolymers tended to decrease with an increase in the mole fraction of ABz in the feed.
In the copolymerization of DAI with ABz the residual unsaturation of the copolymer was nearly constant, regardless of the feed molar ratio, while in the copolymerization of DAT with ABz it tended to increase with increasing the mole fraction of ABz in the feed.
The apparent monomer reactivity ratios obtained on the basis of the general copolymer composition equation were as follows: M₁, r₁, r₂; DAI, 0.69, 1.02; DAT, 0.77, 0.89.
On the other hand, for the copolymerization of DAI with ABz the following monomer reactivity ratios(MRR) were also estimated on the basis of the cyclocopolymerization mechanirn: 7-1=0.77 (MRR of the uncyclized radical), rc=0.52 (MRR of the cyclized radical), r₂=1.00(MRR of the ABz radical).
These results were discussed in connection with the results of the copolymerization of diallyl phthalate with ABz⁵.