• Elastomers and Composites
• /
• 제23권3호
• /
• pp.253-261
• /
• 1988

• Elastomers and Composites
• /
• 제28권2호
• /
• pp.125-132
• /
• 1993

• Carbon letters
• /
• 제8권2호
• /
• pp.115-119
• /
• 2007

Properties of carbon blacks and carbon black/SBR rubber composites filled by surface modified carbon blacks were examined. Although the specific surface area of carbon blacks increased after the surface modifications with heat, acid, and base, there were no obvious changes in resistivity. The composites filled by heat treated carbon blacks showed a higher tensile strength and elongation than those filled by raw blacks. The acid and base treated carbon blacks filled composites also showed higher tensile strength but similar elongation values with those filled by raw blacks. With increasing loading ratio, both tensile strength and elongation increased, and appeared a maximum value at 30-40 phr. Modulus at 300% strain remained increasing with further loading of carbon blacks. At the same loading, the heat treated black filled composites showed similar modulus values with composites filled by raw blacks but for base and acid treated black filled composites much higher values were obtained. After the surface modification, the functional groups which played an important role in reinforcement action were changed.

• Elastomers and Composites
• /
• 제48권1호
• /
• pp.76-84
• /
• 2013

압저항 효과(piezoresistive effect)는 가해진 외부 압력이나 힘에 의해 전기적 저항이 변하는 것을 말한다. 이러한 압저항 효과는 압력, 진동, 가속 등을 탐지하는 센서에 많이 이용되고 있다. 압저항 효과를 갖는 재료가 많지만 그 중에서도 특히, 전도성 충전제를 첨가한 고무 복합체는 충전제의 종류, 입자 크기, 입자 모양, 입자 종횡비(aspect ratio), 그리고 입자의 양 등을 조절하여 다양한 압력 범위에서의 압저항 효과를 발현할 수 있고, 고무를 기질로 사용함으로써 복합체에 탄성과 유연성을 줄 수 있기 때문에 많은 관심을 받고 있다. 본 논문에서는 압저항 효과의 기본원리 및 다양한 고무 복합체의 압저항 효과에 대해 알아본다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 추계학술대회논문집A
• /
• pp.238-243
• /
• 2000

The effect of the temperature, the fatigue and the test speed on DEN(double edged notch) specimen which was made by the pp-rubber composites during fracture was stuied. DEN specimen was made on PP-rubber composites through the injection molding. With increasing temperature the fracture strength is linearly decrease and the fracture energy is first increase by $0^{\circ}C$ and after that decrease. In the same temperature the fracture strength during increasing the notch radius is hardly increase. The fracture behaviour at low and high test speed is different entirely. At high test speed plastic region is small and fracture behaviour was seen to brittle fracture tendency. The deformation mechanism of polypropylene-rubber composites during fracture was studied by SEM fractography. A strong plastic deformation of the matrix material ahead of the notch/crack occured. The deformation seem to be enhanced by a thermal blunting of the notch/crack.

• Elastomers and Composites
• /
• 제47권2호
• /
• pp.148-155
• /
• 2012

EPDM, IIR, 그리고 BIIR 복합체를 열노화시켜 가교밀도 변화를 조사하였다. 노화 시간이 증가하거나 노화온도가 올라갈수록 EPDM 복합체의 가교밀도는 증가하였으나, 고온에서 장기간 노화된 IIR과 BIIR 복합체의 가교밀도는 감소하는 경향을 보였다. EPDM 복합체의 가교밀도 변화에 대한 활성화 에너지는 BIIR 복합체보다 높았다. 실험결과는 알릴 수소의 수, 아연 복합체의 활성화, 입체 가리움 효과, 그리고 고무 사슬의 산화로 설명하였다.

• Elastomers and Composites
• /
• 제57권3호
• /
• pp.107-113
• /
• 2022

The effects of fillers [talc, calcium carbonate, glass fiber, and EBR (ethylene-butene rubber)] on the shrinkage and mechanical properties of injection-molded polypropylene composites were investigated. The shrinkage correlated with the shape of the filler particles: at the same amount added, glass fibers with a large aspect ratio had the greatest effect on the shrinkage of polypropylene composites, followed by flake-shaped talc and granular calcium carbonate. It was confirmed that the addition of EBR rubber as an impact strength modifier reduced shrinkage proportionally to the added content. In addition, the addition of glass fiber resulted in the greatest increases in tensile and flexural strengths.

• Transactions on Electrical and Electronic Materials
• /
• 제7권3호
• /
• pp.134-140
• /
• 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
• /
• 제31권5호
• /
• pp.347-352
• /
• 1996

A natural rubber was blended with a butadiene rubber with different ratios. A natural rubber, along with three different blends, its ratio varying from 10 to 15 to 20 weight %, were prepared and tested. It was found that inclusion of the butadiene rubber increased cure time, compared to the natural rubber. It is speculated that increased free volume due to the inclusion of butadiene rubber contributed to this effect. Furthermore, inclusion of butadiene rubber led to increase hardness of a sphere, and as a result, the extent of rebound increased sharply.

• Elastomers and Composites
• /
• 제50권1호
• /
• pp.24-29
• /
• 2015

In this study, we investigated the effects of a crosslinking agent and a compatibilizer on the mechanical and rheological properties of waste PP and waste ground rubber tire (WGRT) composites. In order to simulate a commercial TPV, the component of waste PP and WGRT was fixed at 30 and 70 wt%, respectively. With the simple addition of SEBS-g-MA into the waste PP/WGRT composites, the tensile strength of the composite was decreased, whereas both the elongation at break and impact strength were significantly increased because of rubbery characteristics of SEBS-g-MA. In order to further improve the properties of the composites, the waste PP/WGRT/SEBS-g-MA composites was revulcanized with dicumyl peroxide (DCP). As expected, mechanical properties of the revulcanized composites was generally improved. Especially, with 15 and 1 phr of SEBS-g-MA and DCP, elongation at break was highest value of about 183% because of the recross-linking of WGRT without chain scission of the main chain. It was found that complex viscosity of the revulcanized composite increased which might verify further vulcanization of the WGRT.