• Title, Summary, Keyword: silicone

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Interfacial Adhesion Enhancement Process of Local Stiffness-variant Stretchable Substrates for Stretchable Electronic Packages (신축성 전자패키지용 강성도 국부변환 신축기판의 계면접착력 향상공정)

  • Park, Donghyeun;Oh, Tae Sung
    • Journal of the Microelectronics and Packaging Society
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    • v.25 no.4
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    • pp.111-118
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    • 2018
  • In order to develop a local stiffness-variant stretchable substrate with the soft PDMS/hard PDMS/FPCB configuration consisting of two stiffness-different polydimethylsiloxane (PDMS) parts and flexible printed circuit board, a FPCB was bonded to PDMS using the acrylic-silicone double-sided tape and the interfacial adhesion of the PDMS/FPCB was evaluated. The pull strength of the FPCB, which was bonded to the fully cured PDMS using the silicone adhesive of the double-sided tape, was 259 kPa and the delamination during the pull test occurred at the interface between the PDMS and the silicone adhesive. On the contrary, the bonding process, for which the FPCB was bonded using the silicone adhesive to the PDMS partially cured for 15~20 minutes at $60^{\circ}C$ and then the PDMS was fully cured for 12 hours at $60^{\circ}C$, exhibited the remarkably enhanced pull strength of 1,007~1,094 kPa. With the above mentioned bonding process, the delamination during the pull test was observed at the interface between the FPCB and the acrylic adhesive of the acrylic-silicone double sided tape.

Effects of Alumina Powder on the Properties of Mica Sheet Impregnated with Silicone Rubber Resin (알루미나 분말의 첨가에 따른 실리콘고무수지 함침 마이카시트의 특성)

  • Park Hyo-Yul;Kang Dong-Pil;Ahn Myeong-Sang;Myung In-Hye
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.12
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    • pp.561-566
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    • 2005
  • This paper describes electrical resistivity, dielectric strength, thermal conductivity, thermal stability and tensile strength of mica sheet impregnated with silicone rubber resin or silicone rubber resin containing alumina powder. The mica sheet impregnated with silicone rubber resin had higher electrical resistivity, dielectric strength and tensile strength than those of virgin mica sheet. Electrical resistivity of mica sheet impregnated with silicone rubber resin containing alumina increased with increasing the amount of alumina. However, dielectric strength and tensile strength of mica sheet impregnated with silicone rubber resin containing alumina decreased with increasing the amount of alumina. The mica sheet impregnated with silicone rubber resin had lower thermal conductivity than that of virgin mica sheet. However, thermal conductivity of mica sheet impregnated with silicone rubber resin conatining alumina increased with increasing the amount of alumina. In the case of thermal stability, thermal degradation of virgin mica sheet and impregnated mica sheet with silicone rubber resin did not occur up to $1100^{\circ}C$ and $400^{\circ}C$, respectively.

The Effect of Silicone Sleeve and Taping on Balance and Strength in Anterior Cruciate Ligament Reconstruction Patients

  • Kwon, Hyo-Jeoung;Park, Dae-Sung;Jeong, Ju Ri;Jung, Kwang-Ik
    • The Journal of Korean Physical Therapy
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    • v.26 no.3
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    • pp.147-155
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    • 2014
  • Purpose: This study was to determine the effects of before and after application of silicone sleeve on balance and muscle strength in anterior cruciate ligament (ACL) reconstruction patients. Methods: 13 subjects who had one or more months after ACL surgery were involved. Dynamic balance, timed up and go (TUG), stair step, vertical jump, proprioception and isokinetic knee strength were measured while subjects under taped, untapped and silicone sleeve conditions. Results: For 30 seconds one-leg standing, there was a significant improvement under silicone sleeve on operated side with eyes open and both taping and silicone sleeve revealed similar effects with eyes closed (p<0.01). Application of silicone sleeve showed significant effects in proprioceptive function on the operated side compared to both taping and none (p<0.05). For stair step test, TUG and vertical jump was a tendency to improve after application of silicone sleeve, but no significant different. Muscle strength on operated side of quadriceps and hamstring was significantly improved compared with none or taping(p<0.05). Conclusion: Silicone sleeve application for ACL reconstruction patients was effective immediately on improving strength and balance. Therefore, depending on the intended use and the disease is considered appropriate use of silicone sleeve will be able to help prevention and functional movement.

Interference Effects on the Thickness of a Pulse Pressure Sensor Array Coated with Silicone (맥 센서 어레이(array)의 실리콘(silicone) 코팅 두께에 따른 센서 간 간섭효과)

  • Jun, Min-Ho;Jeon, Young Ju;Kim, Young-Min
    • Journal of Sensor Science and Technology
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    • v.25 no.1
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    • pp.35-40
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    • 2016
  • Pulse diagnosis is one of the representative diagnostic methods in Oriental medicine. In this study, a pulse pressure sensor array coated with silicone, which includes 6 piezo-resistive sensors and 1 thermistor, is fabricated for pulse measurement. It is necessary to coat the pulse sensor array with silicone to avoid the fracture or damage of pressure sensors when the sensor is in contact with the skin and a constant pressure is applied. However, the silicone coating on the pulse sensor array can cause signal interference among the sensors in the pulse sensor array. The interference number (IN), a calculation for expressing the degree of interference among channels, is changed according to the silicone thickness on the pulse sensor array. The IN is increased by a thick silicone coating, but the fabrication error, an important index for the mass production of the sensor array, is reduced by the thickness of the silicone coating. We propose that the thickness of the silicone on the pulse sensor array is an important consideration for the performance of the fabricated sensor and manufacturing repeatability.

Effects of Hydroxy Silicone Oil on Insulation Properties of Silicone Rubber(1) (Hydroxy Silicone Oil이 실리콘 고무의 절연특성에 미치는 영향(1))

  • 강동필;박효열;안명상;이웅재;이후범;오세호
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.11
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    • pp.1001-1007
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    • 2003
  • The silicone fluids have been generally used as processing agent in silicone rubber(SIR) compounding. The addition of hydroxy silicone (HS) fluids to SIR for insulator housing material is required to meet the good electrical performance and the good processability. In this study, SIR with HS fluids was evaluated to investigate how the kinds of them affect insulation properties. The contact angle of the virgin sample of 40-HS SIR was low and its recovery rate was also slow. The recovery rate of 50-HS SIR was the highest being decreased with the viscosity increase of HS fluids. The tracking resistances and the corona aging resistance of 70-HS SIR and 1,040-HS SIR were excellent Tracking resistance depended largely on heat resistance of silicone fluids. But arc resistance didn't depend merely on the kind of silicone fluids.

The Comparison of EPDM and Silicone in Housing Materials of Polymeric Suspension Insulators (EPDM 및 실리콘 재질의 폴리머현수애자의 특성 비교)

  • Lee, Byung-Sung;Lee, Jae-Bong;Song, Il-Keun;Han, Sang-Ok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.6-10
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    • 2003
  • In our country, the housing materials of polymeric outdoor insulators have mainly been used EPDM or silicone rubber. EPDM housing materials had been widely used in the field for the first time. The reason why silicone has the high cost of production. But recently, most of the manufacturers that newly developed polymeric insulators make its choice of silicone housing. EPDM showed a good resistance to tracking. We compared the various characteristics for EPDM and silicone insulators that have similar type and design. Silicone insulators have more performance in flashover voltage test and leakage current measurement because of a good water repellent than EPDM ones. Also, the property of EPDM compared with silicone insulators greatly decreased after aging test in combined acceleration ageing facilities for 1000 hours.

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The Electrical Properties of High Voltage Silicone Rubber (고전압용 실리콘고무의 전기적 특성)

  • 김성필;송정우;이종필;이수원;김왕곤;홍진웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.779-782
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    • 2000
  • Silicone rubbers are first silicone polymers and has named silicone from existence of Si-O bond similar to Keton. Silicon in organic compound has been called silicone, and linear or network polymers. Silicone rubbers have been used as an power insulator because they are well weather proof, ozone proof and have excellent electric characteristics, thermal stability, cold resistance and low surface energy. Especially, it is known that they have very excellent characteristics at 200[$^{\circ}C$]. For this study, we made silicone rubbers as specimens and we measured dielectric loss tangent due to applied voltage at temperature range 25[$^{\circ}C$] to 180[$^{\circ}C$] and frequency range 20[Hz] to 1${\times}$10$\^$6/[Hz] to examine dielectric properties. We measured dielectric loss tangent to study the insulation performance of silicone rubbers.

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The Preparation of Non-Silicone Oil Based Adhesion Promoted Silicone Sealant (비실리콘 오일을 BASE로 한 접착력 강화 실리콘 실란트의 제조 개발)

  • Han, Gil-Soo;Jeong, Kyoung-Han;Chun, Yong-Jin
    • Proceedings of the KAIS Fall Conference
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    • pp.309-312
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    • 2008
  • We have prepared the silicone sealant using non silicone oil without silicone oil for solvent and using adhesion promotor against various substrate. We are replaced the silicone oil by the mineral oil and the normal adhesion promotor by mixed adhesion promotor at the multi purpose silicone sealant.

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The Analysis of Characteristics of Silicone Rubber in Insulating Oil (절연유에 의한 Silicone Rubber의 특성 변화 분석)

  • Kim, H.J.;Kim, H.J.;Lee, C.M.;Han, J.H.
    • Proceedings of the KIEE Conference
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    • pp.1216-1217
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    • 2008
  • A description is given of impregnated silicone rubber used in accessories for application on outdoor termination (EB-A). We examines the effects of swelling and mechanical/electrical characteristics for impregnated silicone rubber to develop slip on type sleeve of silicone material. There are semi-conductive silicone rubber and insulation silicone rubber. This examination is monitored as a function of the viscosity and temperature of oil during 30hr. We measure elongation at breakdown and AC breakdown strength and volume resistivities of the oil-impregnated silicone rubbers. The measured values are compared to initial value as function of stress relief cone.

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Weatherability Comparison with Changing Mixing Ratios of Mill-Base and Let-Down Silicone/Acrylic Resins (안료분산 및 희석용 실리콘/아크릴수지의 배합비에 따른 고내후성 물성비교)

  • Park, Hong-Soo;Kim, Song-Hyoung;Hahm, Hyun-Sik
    • Journal of the Korean Applied Science and Technology
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    • v.24 no.3
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    • pp.253-263
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    • 2007
  • Three different weather-resistant coatings were fabricated with the various weight ratios of a mill-base silicone/acrylic resin to let-down silicone /acrylic resin at 2:8, 3:7, and 4:6 respectively. The prepared coatings were tested to investigate the effect of composition of weather-resistant coatings on the physical properties. The thermal stability, salt spray exposure, and weather-resistance were improved with the increased silicone content. It was concluded that the optimum retio of mill-base silicone/acrylic resin to let-down silicone/acrylic resin would be 2:8 and the coating with 30 wt% of silicone content would have high weather-resistance.