Abstract
Free radical-initiated copolymerization of diethyl isopropenyl phosphate (DEIPA) with vinyl acetate (VAc) and acrylonitrile (AN) was studied. The monomer reactivity ratios for the monomer pairs, determined at $60^{\cric}C$ using benzoyl peroxide as an initiator, are: ${\gamma}_1$(VAc) = 1.56, ${\gamma}_2$(DEIPA) = 0.44: ${\gamma}_1$(AN) = 15.2, ${\gamma}_2$(DEIPA) = 0.031. The values of the Alfrey-Price constants, Q and e, for DEIPA were calculated to be 0.015 and 0.39, respectively, from the VAc system, and 0.014 and 0.34, respectively, from AN/DEIPA pair. These results indicate that ${\alpha}$-methyl substituent of vinyl phosphate monomer decreases the general reactivity in free radical copolymerization. The intrinsic viscosity and number-average molecular weight of copolymers decreased as their content of DEIPA units increased, indicating a high degree of chain transfer caused by DEIPA, as previously learned in DEVPA system.
자유 라디칼 개시제에 의한 인산디에틸이소프로페닐(DEIPA)과 초산비닐(VAc) 및 아크릴로니트릴(An)의 혼성중합 연구를 행하여 단위체 반응성비를 얻었다. 개시제로는 과산화벤조일을 사용하였으며 중합온도는 $60^{\cric}C$이었다. 단위체 반응성비는${\gamma}_1$(VAc) = 1.56, ${\gamma}_2$(DEIPA) = 0.44: ${\gamma}_1$(AN) = 15.2, ${\gamma}_2$(DEIPA) = 0.031이었다. 이 값으로부터 DEIPA의 Alfrey-Price 상수 Q=0.015, e=0.39 및 Q=0.014, e=0.34를 얻었으며${\alpha}$ 위치에 있는 메틸기가 반응성을 감소시킴을 알았다. 공중합체중 DEIPA의 함량이 증가함에 따라 공중합체의 고유점성도 및 수평균 분자량이 감소함도 알았다.
