4-Methyl-1-vinylnaphthalene (4-MeV₁N) was synthesized by the dehydrochlorination of 4-methyl-1-(1-naphthylethyl)chloride, which had been prepared from 1-methylnaphthalene through the formation of intermediates, 4-methyl-1-acetonaphthone and 4-methyl-1-(1-naphthyl) ethanol. Cationic homopolymerization of 4-MeV₁N was carried out with titanium tetrachloride as a catalyst in dichloromethane at four different temperatures, ranging from -70℃ to 0℃. The conversion and the intrinsic viscosity were increased as the temperature decreased. The observed glass transition temperature of the homopolymer was 148℃. Copolymerization of 4-MeV₁N and styrene was also carried out at -50℃ under the same experimental condition. The copolymer composition was determined by UV spectroscopy. The reactivity ratios of 4-MeV₁N and styrene were estimated as r_l(4-MeV₁N)=4.00 and r₂(St)=1.75, respectively, by the Kelen-T d s method.

4-Methyl-1-vinylnaphthalene(4-MeV₁N)은 4-methyl-1-(1-naphthylethyl)chloride (4-MeN₁EC)를 탈염소화 반응시켜 합성하였다. 4-MeN₁EC는 1-methylnaphthalene을 출발물질로 하여 4-methyl-1-acetonaphthone, 4-methyl-1-(1-naphthyl)ethanol을 합성하고 4-methyl-1-(1-naphthyl)ethanol과 PCI₅를 반응시켜 합성하였다. -7O℃, -5O℃, -25℃ 및 0℃에서 TiCl₄를 개시제로 하여 4-MeV₁N의 양이 온중합에 대한 전환률 그리고 pol(4-methyl-1-vinylnaphthalene)의 고유점도와 T_g를 구하였다. 4-MeV₁N의 전환률과 얻어진 중합체의 고유점도 값은 온도가 증가할수록 감소하였으며 중합체의 T_g값은 148℃이었다. 또한, -50℃에서 TiC1₄를 사용하여 CH₂Cl₂에서 4-MeV₁N과 styrene의 양이온 공중합반응에 대한 단량체반응성을 구하였다. 공중합체 조성은 UV spectroscopy를 사용하여 구하였으며, Kelen-T d s식에 의해 구한 단량체 반응성비 값은 r_l(4-MeV₁N)=4.00이고 r₂(styrene) = 1.75이었다.

Keywords: