• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1581-1583
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• 1999

Epoxy Compound has been used as insulation material in cable accessories. During the applying voltage to cable, heat shock is induced to accessory by the temperature difference between atmosphere and conductor. In this study, crack resistance, thermal and mechanical properties were evaluated about conventional epoxy compound and rubber toughened epoxy compound. Because rubber absorbs the stress caused by heat shock, crack resistance of rubber toughened epoxy compound is high. In the case of low thermal expansion coefficient, the compound shows high crack resistance because of low volumetric change.

• Macromolecular Research
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• 제8권2호
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• pp.73-79
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• 2000

The influence of mastication of natural rubber (NR) on properties of carbon black-filled NR compounds was studied. Variations of viscosities of the masticated NR and the carbon black-filled NR compound by heating were also investigated. The viscosities of the compounds decreased by increasing the mastication time of the raw rubber. The viscosities of the masticated NR and the compounds increased by increasing the heating time. This was explained by the combination reaction between functional groups in the rubber. The viscosity increment of the masticated rubber and the compounds by heating became larger with increased mastication time. Cure rate of the compound became faster by increasing the mastication time. Modulus of the vulcanizate made of the rubber masticated for a long time was higher than that of the vulcanizate made of the rubber masticated for a short time while elongation at break of the former was shorter than that of the latter. This was explained by the content of bound rubber and chain length of the rubber molecules.

• 폴리머
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• 제38권4호
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• pp.411-416
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• 2014

극성을 띠고있어 응집되는 성향이 카본블랙에 비해 강한 실리카의 분산도는 고무 복합소재의 물성을 좌우하는 중요한 요소이다. Wolff는 입자간 상호계수(${\alpha}_F$)를 도입하여 충전제간의 구조발달을 최초로 표현하였다. 하지만, 양기능성 실란의 도입에 따라 형성되는 3차원 구조발달은 표현할 수 없었다. 후에 이를 보완하기 위하여 Wolff의 표현은 복합소재 내 ${\alpha}_F$를 포함하는 구조발달 상호계수 ${\alpha}_C$로 확장되어 표현되었지만, 실험적으로 이 표현을 증명한 연구는 없었다. 이 논문은 구조발달 상호계수인 ${\alpha}_C$를 ${\alpha}_F$(실리카-실리카간 구조발달 상호계수), ${\alpha}_{FP}$(실리카-실란-고무간 구조발달 상호계수), ${\alpha}_P$(고무-고무간 구조발달 상호계수)로 고려하여 단기능성 및 양기능성 실란으로 처리된 실리카가 함유된 복합소재를 실험에 의해 최초로 표현하였다. 구조가 다른 실란들(PTES, OTES, TESPD, TESPT)을 이용하여 구조발달 상호계수 ${\alpha}_C$를 구성하는 ${\alpha}_F$, ${\alpha}_{FP}$, ${\alpha}_P$의 수치들을 측정하고 계산하였다. TESPT가 첨가된 복합소재의 ${\alpha}_C$의 값은 1.64이며, 이를 구성하고 있는 ${\alpha}_F$, ${\alpha}_{FP}$, ${\alpha}_P$는 각각 0.99, 0.31, 0.34로 나타났다.

• Elastomers and Composites
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• 제45권3호
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• pp.223-229
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• 2010

가공기기의 기하학적 구조(geometry)가 실리카 분산에 대해 미치는 영향을 알아보기 위해서 롤밀(two roll mill)과 밀폐식 혼합기(internal mixer)를 사용하여 실리카가 충전된 부틸고무 가황물을 제조하여 가황특성, 인장특성 및 실리카 분산을 비교하였다. 가공 시, 롤밀을 사용하여 제조한 배합물은 밀폐식 혼합기를 사용하여 제조한 배합물보다 경화 속도($t_{90}$)는 약간 느렸으나, 긴 유도시간($ts_2$), 높은 최대 토크 값($T_{max}$)을 보였다. 또한 롤밀을 사용하여 제조한 배합물은 실리카 입자의 분산 및 기계적 물성의 특성에 있어서 밀폐식 혼합기를 사용했을시 보다 상대적으로 우수함을 보였다.

• Elastomers and Composites
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• 제38권1호
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• pp.72-80
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• 2003

자동차 Oil cooler용 호스를 구성하는 고무재료의 내열 및 난연성을 향상시키기 위하여 인산 에스테르계 화합물을 내열 및 난연제로 하여 제조한 염소화 폴리에틸렌(CPE) 배합고무의 가황 특성, 물리적 성질, 내열성, 난연성 및 변량효과를 조사하였다. 호스용 고무재료는 기존의 ethyleneacrylate rubber(EAR)보다 화학적 내식성과 내한성이 우수하면서도 가격이 저렴한 CPE 고무재료를 사용하였으며, 난연제는 비할로겐 축합 인산 에스테르계인 N,N'-bis-(diphenylphosphoro) diaminohexane(BDPDH)를 합성하여 CPE 고무재료와 $0{\sim}30 phr$ 범위에서 혼련하였다. 배합고무시편의 경도, 인장강도, 신율, 인장응력 및 열적 특성을 측정한 결과, CPE 배합고무의 유동성, 난연성, 내열성이 향상되었음을 확인하였으며, 고무재료 규격을 초과하지 않는 범위 내에서 최대의 내열 및 난연 효과를 주는 BDPDH의 배합량은 20 phr로 나타났다.

• Elastomers and Composites
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• 제33권1호
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• pp.17-26
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• 1998

Natural rubber was filled with 8 commercial carbon blacks covering range of rubber-grade products at different levels of filler loadings in order to investigate physical compound and vulcanizate properties. It was found that the curves of rubber property vs filler loading of both uncured compounds and vulcanizates can be superposed to one single master curve by introducing an effective volume fraction which is based on CDBP. The effective volume fraction, $V_{EFF}$ was utilized to explain the variation of the stiffness of all rubber compounds. The surface area-corrected effective volume fraction, V', was utilized to explain the formation of bound rubber, rebound and lambourn wear.

• Elastomers and Composites
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• 제32권5호
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• pp.318-324
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• 1997

Since the rigid and continuous networks of high-purity silica(white carbon) were relatively transparent to microwaves, high purity silica coupled with microwaves using a zirconia susceptor at room temperature and it was then heated to its melting temperature. The low-purity silica, contained small amount of impurities, yielded greater microwave absorption owing to easy motion of the interstitial alkali ions and it was then heated to its melting temperature. X-ray diffraction patterns of the low-purity silica were broader than those of the high-purity silica due to higher concentration of non-bridging bond and more deformed random network structure. In the vulcanization process of whitened or coloured rubber compound which is employing low-purity silica(white carbon) as a reinforcing filler, vulcanizate could be obtained effectively by microwave heating energy.

• Elastomers and Composites
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• 제56권4호
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• pp.234-242
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• 2021

The demand for truck bus radial (TBR) tires with enhanced fuel efficiency and wear resistance have grown in recent years. In addition, as the issue of particulate matter and air pollution increases, efforts are being made to reduce the generation of particulate matter. In this study, the properties of epoxidized natural rubber (ENR) containing a silica-friendly functional group were evaluated by considering it as a base rubber and varying the silica ratio in this binary filler system. The results showed that the wear resistance of the NR/BR blend compound decreased as the silica ratio increased. In contrast, the ENR/BR blend compound exhibited an increase in wear resistance as the silica ratio was increased. In particular, the ENR-50/BR blend compound showed the best wear resistance due to the presence of several epoxide groups. Furthermore, we observed that for tan 𝛿 at 60℃, higher epoxide content resulted in the higher T_g of the rubber, indicating a higher tan 𝛿 at 60℃. On the other hand, it was confirmed that increasing the silica ratio decreased the value of tan 𝛿 at 60℃ in all compounds. In addition, we measured the amount of wear particulate matters generated from the compound wear. These measurements confirmed that in the binary filler system, regardless of the filler type, the quantity of the generated wear particulate matters as the filler-rubber interaction increased. In conclusion, the silica filled ENR/BR blend compound exhibited the lowest generation of wear particulate matters.

• Elastomers and Composites
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• 제44권3호
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• pp.252-259
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• 2009

양기능성실란(TESPD)이 실리카가 함유된 SBR 복합 소재에 첨가되었을 시 그에 따른 가교특성, 가공정도, 물리적 특성들에 미치는 영향을 조사하였다. TESPD를 첨가한 SBR 복합 소재는 TESPD가 실리카와 고무를 화학적으로 결합하여 3차원적인 구조를 형성함으로해서 가교밀도가 증가하였고, 이에 따라 기계적 강도가 증가하였다. 이는 또한 TESPD를 첨가하지 않은 소재와 비교했을 시 가공성이 증가하였다.

• 고무기술
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• 제17권1_2호
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• pp.18-33
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• 2016