Styrene/Butadiene/Acrylonitrile계 무유화제 유화중합

정희실; 신영조

Journal of the Korean Industrial and Engineering Chemistry, Vol.4, No.2, 284-290, June, 1993

Export Citation

Styrene/Butadiene/Acrylonitrile계 무유화제 유화중합

Soap-Free Emulsion Polymerization of Styrene/Butadiene/Acrylonitrile System

정희실, 신영조

초록

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.

[References]

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[1] Matsumto T, Ochi A, Kobunshi Kagaku, 22, 481 (1965)

[2] Kotera A, Furusawa K, Takeda Y, Kolloid Z.A. Polym., 269, 677 (1970)

[3] Goodwin JW, Hearn J, Ho CC, Ottewill RH, Br. Polym. J., 5, 347 (1973)

[4] Juang MSD, Krieger IM, J. Polym. Sci. A: Polym. Chem., 14, 2089 (1976)

[5] Liu LJ, Krieger IM, J. Polym. Sci. A: Polym. Chem., 19, 3031 (1981)

[6] Kawaguchi H, Ohtsuka Y, Sugi Y, J. Appl. Polym. Sci., 26, 1637 (1981)

[7] Park LS, Lim YJ, Chang JG, Polym.(Korea), 13(8), 683 (1989)

[8] Chung HS, Ahn JJ, Lee CS, Shin YJ, Polym.(Korea), 17(2), 121 (1993)

[9] Perrin DD, Armarego WLF, "Purification of Laboratory Chemicals," 3rd ed. (1985)

[10] ASTM D1646

[11] ASTM D15

[12] ASTM D2240

[13] JSR Manual

[14] Fitch RM, Prenosil MP, Sprick KJ, J. Polym. Sci. C: Polym. Lett., 27, 95 (1969)

[15] Goodall AR, Wilkinson MC, Hearn J, J. Polym. Sci. A: Polym. Chem., 15, 2193 (1977)