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Strene / Butadiene / Acrylonitrile 계 무유화제 유화중합
정희실,신영조 ( Huey Sil Chung,Young Jo Shin ) 한국공업화학회 1993 공업화학 Vol.4 No.2
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.
Styrene - Butadiene 무유화제 유화공중합에서의 아크릴계 친수성 공단량체의 영향
신영조,김병규,정희실,이창성 한국고무학회 1993 엘라스토머 및 콤포지트 Vol.28 No.4
A number of hydrophilic acrylic comonomers were incorporated into styrene-butadiene soap-free emulsion polymerization. It was found that reaction rate decreased according to : AN$gt;AA$gt;MMA$gt;EA$gt;IA$gt;AAM$gt;MA$gt;HEMA. It was also observed that reaction rate increased with decreasing H-bonding factor contribution to the solubility parameter of the hydrophilic comonomer. The SBR latexes were very monodisperse with the particle size distribution of 1.03∼1.12. Since growth rate is proportional to polymerization time, the difference in conversion rates between various comonomers was resulted from the particle number density of SBR latexes for the various hydrophilic comonomers. It was also found that the colloidal stability of the latexes was excellent because no external emulsifier was incorporated.