α,w-Vinyl poly (dimethyl-methylphenyl)siloxane prepolymer (VPMPS) was prepared by the equilibrium polymerization of octamethylcyclotetrasiloxane (D4), 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane (D3Me,Ph), and 1,1,3,3-tetramethyl-1,3-divinyldisiloxane (MVS). And also, α,w-hydrogen poly(dimethyl-methyl)siloxane prepolymer (HPDMS) as end blocker was prepared from octamethylcyclotetrasiloxane (D4), 1,3,5-trimethylcyclotrisiloxane (D3 Me,H), and 1,1,3,3-tetramethyldisiloxane (MS). Nickel ferrite nanoparticles having spinel magnetic material was prepared by the sol-gel method using PAA as a chelating agent. Poly(organosiloxane) rubber nanocomposite containing silica and nickel ferrite ultrafine powder modified with 1,3-divinyltetramethyldisilazane (VMS) was prepared by compounding VPMPS, HPDMS, and catalyst in high speed dissolver. The mechanical properties, heat dissipating away characteristics, and volume resistivities for POX-30 and POX-50 were measured.

Octamethylcyclotetrasiloxane(D4)과 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane(D3Me,Ph)을 1,1,3,3-tetramethyl-1,3-divinyldisiloxane(MVS)과 평형중합시켜 실리콘의 Si원자에 dimethyl 및 methylphenyl기가 도입된 α, w-hydrogen poly(dimethyl-methyl) siloxane prepolymer(HPDMS)를 제조하였다. Poly(acrylic acid)(PAA)을 chelating agent로 하여 nickel(II)nitrate와 iron(III) nitrate를 솔-젤 방법으로 PAA 금속염을 제조하고 이들을 소결시켜 nickel ferrite 나노 입자를 제조하였다. 제조한 nickel ferrite 는 XRD 패턴으로 확인하고 입자의 크기를 TEM으로 측정하였다. 1,3-Divinyltetramethyldisila-zane(VMS)으로 표면처리한 나노 실리카, nickel ferrite, VPMPS, HPDMS 및 촉매를 고속 교반기에 가하고 130 ℃에서 컴파운딩하여 poly(organosiloxane) rubber nanocomposites를 제조하였다. Nickel ferrite 함유한 nanocomposite, POX-30과 POX-50을 각각 제조하였으며 이들의 기계적 및 열전도 특성 그리고 체적 저항을 측정하였다.

Keywords: equilibrium polymerization; poly(organosiloxane) rubber; nickel ferrite; 1,3-divinyltetramethyldisilazane