In order to synthesize polymer particle containing inorganic material, styrene and nbutylmethacrylate were copolymerized with alumina by dispersion polymerization. The weight ratio of styrene to n-butylmethacrylate was 3：1. A poly(N-vinyl pyrrolidon) was added as stabilizer. 2,2′-Azobis(isobutyronitrile) and 3-methacryloxypropyl trimethoxysilane were used as initiator and coupling agent, respectively. The weight ratio of 70：30 of isopropanol to distilled water was used as dispersion medium. According to the TEM measurement, we could confirm that alumina was dispersed into the polymer particle. The increase of concentration of alumina resulted in enhancement of particle size, but decreased its distribution. By the XRD method, it was found that the increase of alumina concentration showed the increase of intensity in peak and the increased 2θ value. From the TGA measurement, the increase of alumina concentration caused high heat resistance of the polymer. With respect to the type of initiator, the longer half life of initiator, the smaller particle size. We also found that the increase of particle stabilizer concentration made the decreased of particle size due to the accelerated generation of polymer particle in the early stage of reaction.

분산중합법에 의해 고분자 미립자를 합성하기 위해 스티렌과 n-butylmethacrylate가 알루미나와 함께 중합 되었다. 스티렌과 n-butylmethacrylate의 비는 3：1이었고, 입자안정제는 poly(N-vinyl pyrrolidon), 중합 개시 제로는 2,2′-azobis(isobutyronitrile)를 커플링제는 3-methacryloxypropyl trimethoxysilane을, 분산매로 이소프로판올과 이온교환수를 70：30의 비로 사용하였다. TEM 사진을 통해 알루미나가 고분자 미립자에 분산되어 있음을 확인하였고 알루미나의 농도가 증가함에 따라 평균 입자경이 증가하였으며 입자경 분포는 감소되는 경향을 보였다. XRD 측정에 의해 알루미나의 농도 증가는 피크 강도와 2θ 값의 증가를 보였으며 TGA 측정으로 알루미나의 농도의 증가는 고분자 미립자의 내열성을 증가시킴을 알 수 있었다. 사용한 개시제의 반감기가 길수록 입자경은 감소하였고 입자안정제의 농도가 증가할수록 반응초기의 핵생성이 증가하여 입자경이 또한 감소함을 알 수 있었다.

Keywords: dispersion polymerization; particle size; styrene; n-butylmethacrylate; alumina