• Elastomers and Composites
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• 제30권3호
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• pp.207-217
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• 1995

The reinforcement of Inorganic filler silica treated with LBR-MDI In SBR vulcanizates were Investigated. The inorganic filler silica treated with MDI on unmodified surface and that of silica treated by MDI was retreated with LBR. The charateristics of vulcanization, physical properties, surface properites and dynamic properties were investigated after mixing those silica with SBR and unmodified silica with SBR. Rheometric studies of the vulcanization showed that S-series has fast scorch $time(t_{10})$ and an optimum cure $time(t_{90})$ in the SBR compounds. And it was turned out that SBR vulcanizates compounded with LBR treated silica was better than any other componnds in hardness, tensile strenght, 100 300% modula and elongation. We could confirm that urea bonding is formed from IR spectrum. We concluded that L-series shows the best reinforcement effect in SBR vulcanizates.

• Elastomers and Composites
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• 제52권1호
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• pp.35-47
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• 2017

A comprehensive survey of the available literature showed that in the last few decades, there has been a growing interest in the use of thermoplastic vulcanizates (TPVs). TPVs are the second largest group of soft thermoplastic elastomers (TPEs) after styrene-based block copolymers, and offer a wide range of potential and proven applications, including in mechanical rubber goods, under-the-hood applications in the automotive field, industrial hose applications, electrical applications, consumer goods, and soft touch applications. Over the last two decades, TPVs have shown a strong and steady market growth (~12% per year). Commercialized TPVs are commonly based on blends of ethylene propylene diene monomer (EPDM) rubber and polypropylene (PP), and to a lesser extent on combinations of butyl or nitrile rubber with PP. EPDM/PP TPVs are characterized by finely dispersed crosslinked EPDM rubber particles (particles size varying between 0.5 and $2.0{\mu}m$) distributed in a continuous thermoplastic PP matrix. If the rubber particles of such a blend are small enough and if they are vulcanized well enough, then the properties of the blend are generally improved. This review article introduces various topics and aspects relevant to EPDM/PP TPVs. The development of TPVs, the use of various types of crosslinking systems and co-agents as crosslinking agents for PP/EPDM blends, the morphology and rheology of TPVs, and their typical end-use applications are also reviewed.

• Elastomers and Composites
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• 제34권2호
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• pp.147-155
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• 1999

고무와 혼합된 왁스는 고무 표면으로 이동하여 방어막을 형성한다. 일반적으로 고무의 오존화를 방지하기 위해 오존노화방지제를 왁스와 함께 사용하고 있다. 다양한 종류의 왁스가 첨가된 천연고무 가류물을 이용하여 왁스막이 오존노화방지제의 이동에 미치는 영향을 연구하였다 오존노화방지제로 IPPD (N-isopropyl-N'-phenyl-p-phenylenediamine), HPPD (N-l,3-dimethylbutyl-N'-phenyl-p-phenylenediamine), SBPPD (N,N'-di(sec-butyl)-p-phenylenediamine), 그리고 DMPPD (N,N'-di(1,4-dimethylpentyl)-p-phenylenediamine)를 사용하였다. 노화방지제 이동 실험은 $60^{\circ}C$ 와 $80^{\circ}C$에서 10, 20, 30일간 실시하였다. 노화방지제의 이동속도는 고무가류물에 왁스가 없을 때가 있을 때보다 빨랐으며 분자량이 큰 왁스가 혼합되었을 때가 분자량이 작은 왁스가 혼합되었을 때보다 느렸다. DMPPD와 SBPPD의 이동속도가 HPPD와 IPPD의 이동속도보다 빨랐다.

• 한국환경과학회지
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• 제9권6호
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• pp.511-515
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• 2000

The purpose of this experiment is to prepare ethylene propylene diene terpolymer(EPDM)/ acrylonitrile butadiene rubber(NBR) blend which represents good environmental resistant properties including favorable oil and ozone resistance. With incorporation of EPDM, NBR and other ingredients, the rubber and chemical additives were mixed by mechanical method such as Banbury mixer and open 2-roll mill. Then rubber vulcanizates were manufactured by hot press and mechanical properties, oil and ozone resistance of the test specimens were measured. The oil resistance and ozone resistance of EPDM and NBR, respectively, is remarkably improved by blending EPDM with NBR. The optimum results of oil and zone resistant characteristics were obtained at EPDM/NBR(=25/75 wt%) composition ratio.

• Macromolecular Research
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• 제8권6호
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• pp.285-291
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• 2000

Influence of silane coupling agent, bis-(3-(triethoxisilyl)-propyl)-tetrassulfide, on cure characteristics and bound rubber content of filled styrene-butadiene rubber (SBR) compounds and on physical properties of the vulcanizates was studied. Carbon black-filled and silica-filled compounds were compared. Content of the bound rubber increased with increased content of the silane coupling agent and this trend was shown more clearly in the silica-filled compounds. Optimum cure time of the carbon black-filled compound increased with increase of the silane content, while that of the silica-filled one decreased. Cure rate of the carbon black-filled compound became slower as the silane content increased while that of the silica-filled one became faster. By increasing the silane content, the minimum torque decreased and the delta torque increased. Physical properties of the silica-filled vulcanizate were found to be improved by adding the silane coupling agent. However, for the carbon black-filled vulcanizates, the tensile strength and tear resistance decreased with increase of the silane content. The differences between the carbon black-filled and silica-filled compounds were explained by difference in the reactivities of the fillers with the silane.

• Elastomers and Composites
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• 제19권4호
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• pp.231-242
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• 1984

NR vulcanizate has its unigue characteristic of cushion, silence, vibration energy absorbtion etc. By reason of the above captioned characters, The vulcanizate has been widely applied to production of auto tires, belts and engine mounts, The purpose of this study is to examine the effect of rubber-filler attachments on the various dynamic properties of the NR vulcanizates. For this study, the elastic modulus and damping values are examined by means of the (RDS) the Good Rich Flexometer. The results of this study showed as follows. The damping values of the vulcaniz ates in the elastic region showed showed strong relations the damping values and the filler characteristics. The vulvanizates filled with carbon black had higher damping values than the vulcanizates loaded with inorganic filler. The Goodrich Flexometer test showed that build up for the silica filled NR vulcanizates was higher than those for which contained other fillers.

• Elastomers and Composites
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• 제29권1호
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• pp.18-29
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• 1994

The purpose of this study is to investigate reinforced effect between silica treated by coupling agents and rubber matrix under the configuration chemical bonds, and the effect of silica particles coated by organic polymers using aluminum chloride as the catalyst. In vulcanization characteristies were tested by Curastometer. The M-series vulcanizates were reached to the fastest optimum cure $time(t_{90})$ and R-series vulcanizates with the same formula had the shorted optimum cure times. Tensile characteristics measuring with a tensile tester revealed that the M-series vulcanizate was the best in the physical properties, such as tensile strength. In 100% modulus, however, the S-series vulcanizates appeared to be better than the other vulcanizates. Also, hardness showed the following order : S-series>R-series>M-series with the order of elongation R-series>M-series>S-series. In SEM test, shapes of chemical treated silicas were observed. The dispersion of filler in the SBR composite appeard uniformly. In RDS test for the dynamic characteristics, G' indicates that S-3 shows the highest value with the next order M-3>R-3, and the order of damping values are as followe: M-3>M-3>R-3.

• Elastomers and Composites
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• 제44권4호
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• pp.397-400
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• 2009

오존은 상온에서 폴리머 이중 결합의 산화작용을 활발하게 하여 표면 갈라짐을 유발시킨다. 왁스는 고무 표면으로 이동하여 물리적 방어막을 형성하여 오존의 작용을 방지한다. 비보강 NR, SBR, BR 가황물을 상온에서 6개월간 노화 시켜 노화 전후의 왁스의 분자량 분포 변화를 조사하였다. 상온 조건에서 고무 가황물에 있는 왁스의 이동과 증발 거동은 노화방지제로서의 왁스의 역할과 고무 제품의 외관 오염을 이해하는데 도움을 준다. NR 시험편에서 알칸의 상대 세기 분포는 노화 후 고분자량쪽으로 이동하였으나 SBR 시험편의 경우에는 노화 전후의 분자량 분포 모양에는 큰 차이가 없었다.

• Elastomers and Composites
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• 제41권3호
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• pp.164-171
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• 2006

실리카 또는 카본블랙으로 보강된 SBR 가황물의 응력 풀림 거동을 연구하였다. 1,2-단위체 함량이 18과 60 wt%인 두 가지 SBR을 사용하였으며 보강 시스템으로 카본블랙과 실리카에 실란 결합제가 없는 것 그리고 실리카에 실란 결합제가 있는 것 등 세 가지를 사용하였다. SBR 가황물의 응력 풀림 거동은 보강 시스템뿐만 아니라 SBR 종류에 따라서도 달라졌다. 실리카로 보강된 시료는 카본블랙으로 보강된 시료보다 잔류 변형률이 높았다. 실리카로 보강된 가황물의 잔류 변형률은 실란 커플링제를 첨가함으로써 크게 감소하였다. 카본블랙으로 보강된 가황물의 50% 최대 신장에서의 최대 하중은 실리카로 보강된 가황물의 경우보다 낮았다. 이와는 반대로 카본블랙으로 보강된 가황물의 200% 최대 신장에서의 최대 하중은 실리카로 보강된 가황물의 경우보다 높았다. 1,2-단위체 함량이 60 wt%인 시료의 최대 하중은 1,2-단위체 함량이 18 wt%인 시료의 경우보다 보강 시스템에 상관없이 높았다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1996년도 춘계학술발표회 논문집
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• pp.5-8
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• 1996