AN을 친수성 공단량체로 하고, KPS를 개시제로 하여 St/BD의 무유화제 유화중합을 해 본 결과, 전환율 50% 이하에서 Rp의 [AN]^n 및 [KPS]^n에 대한 의존성은 각각 n=1.617-1.050 및 n=0.83-0.96을 보였으며, 입자수 밀도(Np)의 [AN]^n 및 [KPS]^n 의존성은 n=1.533 및 n=0.733이었다. 그리고 pH=5 , 총단량체 (g)/물(g)=0.5일 때 전환율이 가장 높았으며, 얻어진 SBR은 상용 SBR에 비해 가류속도가 훨씬 빠르고, tensile strength, 300% modulus, elongation 등 기본 물성에서 열세였다.

The soap-free emulsion polymerization was carried out for Styrene/Butadiene system with Acrylonitrile as hydrophilic comonomer and KPS as initiator. Under the condition of below 50% conversion, the dependence of Rp on [AN]^n and [KPS]^n was found to be n= 1.617-1.050 and n=0.83-0.96 for [AN] and [KPS], respectively. The effect of [AN]^n and [KPS]^n on particle number density (Np) was determined to be n= 1.533 and n=0.733, respectively. The highest conversion was obtained under the conditions of pH=5 and ratio of total monomer (g) to water (g) =0.5. The mechanical properties of SBR obtained in this experiment were shown to be inferior to commercial SBR in terms of tensile strength, 300% modulus and elongation. It was found that cure rate of SBR prepared in this experiment was faster than that of commercial SBR.