• Elastomers and Composites
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• 제44권3호
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• pp.260-268
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• 2009

Clay의 표면을 bis[(3-triethoxysilylpropyl)tetra sulfide (TSS)으로 처리하면 clay 표면의 소수성이 증가 될 뿐만 아니라 high temperature vulcanization 형 silicone rubber(HTV)와 화학적 반응이 가능하기 때문에 clay와 silicone rubber 사이의 상용성이 향상될 수 있을 것으로 예상되어 TSS를 이용하여 Na-MMT와 Fe-MMT의 silicate 층 표면에 tetra sulfide 그룹을 도입시킨 Na-$MMTS_4$와 Fe-$MMTS_4$를 각각 제작하였다. 이들 clay를 HTV silicone rubber와 compounding하여 silicone rubber/clay composites를 제작하였으며, clay의 종류 및 표면개질에 따른 silicone rubber 복합체의 열적안정성 및 기계적 물성을 평가하였다.

• Elastomers and Composites
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• 제54권2호
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• pp.142-148
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• 2019

In this study, the effects of filler particle size and shape on the physical properties of silicone rubber composites were investigated using inorganic fillers (Minusil 5, Celite 219, and Nyad 400) except silica, which was already present as a reinforcing filler of silicone rubber. Fillers with small particle sizes are known to facilitate the formation of the bound rubber by increasing the contact area with the polymer. However, in this experiment, the bound rubber content of Celite 219-added silicone composite was higher than that of Minusil 5-added silicone composite. This was attributed to the porous structure of Celite 219, which led to an increase in the internal surface area of the filler. When the inorganic fillers were added, both thermal decomposition temperature and thermal stability were improved. The bound rubber formed between the silicone rubber and inorganic filler affected the degree of crosslinking of the silicone composite. It is well-known that as the size of the reinforcing filler decreases, the reinforcing effect increases. However, in this experiment, the hardness of the composite material filled with Celite 219 was the highest compared to the other three composites. Furthermore, the highest value of 2.19 MPa was observed for 100% modulus, and the fracture elongation was the lowest at 469%. This was a result of excellent interaction between Celite 219 filler and silicone rubber.

• 대한전기학회논문지
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• 제41권6호
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• pp.640-651
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• 1992

This paper describes the electric properties of mica reinforced silicone composites with the parameter of curing condition of silicone resin, application amount of silane coupling agent to the mica paper and the mica wt% to the composite. Heat-resistant silicone resin and mica paper made of mica flakes are used to prepared the mica/silicone composite as matrix and filler, respectively. To improve the dielectric properties and interfacial adhesion between matrix and filler, silane coupling agent is applied on the mica paper. As for matrix, tan$\delta$ value of 30$0^{\circ}C$ heat-treated silicone resin is the lowest under 1%. The optimal wt% of coupling agent is 0.3% to the weight of mica paper. 80 wt% of mica as filler to the mica/silicone composite shows the best electric properties. And the mica reinforced silicone composite shows good high-frequency and mechanical tensile stress properties.

• Elastomers and Composites
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• 제38권3호
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• pp.227-234
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• 2003

배합고무에 각종 표면처리제로 처리한 수산화 알루미늄을 무게비 100:20, 100:40, 100:60, 100:80 및 100:100으로 배합하여 고압애자용 실리콘 복합체(HVI SC)를 제조하였다. 배합 공정에서 지방산, 아크릴 실란 및 비닐 실란등의 표면처리제로 수산화 알루미늄을 표면처리하였다. 수산화알루미늄의 첨가량 및 표면처리제의 종류에 따른 기계적 특성 및 전기적 특성을 연구하였다. 수산화 알루미늄의 첨가량이 증가하면서 인장강도, 신장율 및 인열강도는 감소하였으며, 비닐 실란으로 표면처리한 수산화 알루미늄을 첨가한 HVI SC의 인장강도 및 탄성율은 지방산 및 아크릴 실란을 사용한 HVI SC 보다 우수하였다. 또한 비닐 실란을 사용한 HVI SC의 체적저항, 절연파괴강도 및 내트래킹 특성이 지방산 및 아크릴 실란을 사용한 HVI SC 보다 우수하였다. 표면처리제의 종류에 따른 실리콘 복합체의 고분자 충전작용은 결합고무 함량으로 검토하였다. 실험의 결과로는 비닐 실란을 표면처리제로 사용한 실리콘 복합체의 결합고무 함량이 다른 표면처리제를 사용한 것 보다 높았다 표면처리제의 종류에 따른 실리콘 복합체의 가교밀도는 Rheometer로 측정하였다 비닐 실란을 표면처리한 수산화 알루미늄을 충진한 실리콘복합체의 최대토크가 다른 표면처리제를 사용한 것들 중에 가장 높았다.

• Transactions on Electrical and Electronic Materials
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• 제7권3호
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• pp.134-140
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• 2006

The effect of surface treatment of fillers on the mechanical, electrical properties, and tracking performance of silicone rubber insulators have been investigated. For base polymer, $\alpha,\;\omega$) vinyl poly(dimethyl-methylphenyl) siloxane(VPMPS) containing dimethyl siloxane and methylphenyl siloxane was prepared by the equilibrium polymerization. High voltage silicone rubber composites(HVSRC) were prepared from VPMPS, nano-silica, and alumina trihydrate (ATH) modified by various coupling agents. Bound rubber of uncured silicone rubber, cross-linking density of the vulcanizate as well as the mechanical, electrical properties, and tracking performance were measured.

• Elastomers and Composites
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• 제46권2호
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• pp.164-170
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• 2011

본 연구에서는 실리콘 고무의 내열 및 내화 특성과 같은 열적 특성을 향상시키기 위해 실리콘 고무와 친환경 재료인 펄라이트를 기계적인 방법으로 혼합하여 실리콘 고무/펄라이트 복합체를 제조하였다. 다양한 분석 방법을 통하여 실리콘 고무/펄라이트 복합체의 특성은 펄라이트의 함량에 의존한다는 것을 확인하였다. 열중량 분석에서 순수한 실리콘 고무보다 실리콘 고무/펄라이트 복합체가 더 높은 온도에서 분해가 시작됨을 확인하였다. 가스 토치 시험을 통하여 펄라이트가 첨가된 복합 재료의 후면 온도가 순수한 실리콘 고무에 비하여 현저히 낮음을 알 수 있었고, RABT(Richtlinien fur die Ausstatung und den Betrieb won Stra${\beta}$entunneln) 조건에 따른 내화로 시험 그리고 탄화로 시험에서 펄라이트의 함량이 5 wt% 와 10 wt%인 복합체가 뛰어난 열적 안정성을 나타내었다. 주사전자현미경 (SEM)으로 실리콘 고무 내에서 펄라이트의 분산정도를 관찰하였다. 또한 한계산소지수(LOI)는 펄라이트의 함량에 따라 증가함을 확인하였다.

• Elastomers and Composites
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• 제51권4호
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• pp.269-274
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• 2016

Two different reactive silicone oligomers, hydroxylpropyl terminated PDMS (PDMS-L) and 1-(2,3-dihydroxy-propoxy)propyl terminated PDMS (PDMS-B), were synthesized through hydrosilylation reaction under Karstedt's catalyst. Using the reactive silicone oligomers, two different silicone-modified gel-coat series were prepared to investigate their thermal and mechanical properties as well as surface characteristics according to reactive silicone oligomer contents. In case of thermal stabilities and mechanical properties, the gel-coat series containing PDMS-B showed higher values than that of the gel-coat series containing the PDMS-L. The contact angle for the gel-coat containing both silicone oligomers/was increased with reactive silicone oligomer contents but there was similar surface tension between PDMS-L and PDMS-B.

• Elastomers and Composites
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• 제56권4호
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• pp.209-216
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• 2021

In this study, we observed the mechanical properties, thermal stability, and low temperature sealing performance of fluorosilicone elastic composites. When the blend ratio of Phenyl vinyl methyl silicone (PVMQ) was increased, the tensile strength, modulus at 100%, and compression set were decreased. The thermal stability of fluorosilicone elastic composites showed a similar tendency. These were caused by poorer green strength of PVMQ than Fluorosilicone rubber (FVMQ). The change in the tensile strength and elongation at -40℃ showed a decreasing tendency with increasing PVMQ blend ratio. By increasing the PVMQ blend ratio, low-temperature performance was improved. The Dynamic mechanical analysis (DMA) results showed that T_g was decreased and low-temperature performance was improved with increasing PVMQ blend ratio. However tanδ was decreased becaused of the poor green strength and elasticity of PVMQ. From a hysteresis loss at -40℃, the hysteresis loss value was increased and fluorosilicone elastic composites showed the decreasing tendency of elasticity with increasing PVMQ blend ratio. From the TR test, TR10 was decreased with increasing PVMQ blend ratio. FS-4 (45% PVMQ blended composites) showed a TR10 of -68.0℃ that was 5℃ lower than that of FS-1 (100% FVMQ). The gas leakage temperature was decreased with increasing PVMQ blend ratio. The gas leakage temperature of FS-4 was -69.2℃ that was 5℃ lower than that of FS-1. Caused by the polymer chain started to transfer from a glassy state to a rubbery state and had a mobility of chain under T_g, the gas leakage temperature showed a lower value than T_g. The sealing performance at low temperature was dominated by T_g that directly affected the mobility of the polymer chain.

• Elastomers and Composites
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• 제18권1호
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• pp.21-29
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• 1983

• Elastomers and Composites
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• 제7권2호
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• pp.156-159
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• 1972