• 한국환경과학회지
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• 제10권1호
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• pp.73-77
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• 2001

This study examined blends of styrene butadiene rubber(SBR) and chloroprene rubber(CR) prepared from an open 2-roll mill following the conventional polymer blend method for a wide range of the blend composition. Rubber vulcanizates were manufactured by hot press and then mechanical properties, heat and ozone resistance of the specimens were examined. Due to the post cure during the aging test, hardness of vulcanizates was increased. It was found that the undesirable characteristics of heat and ozone resistance of pure SBR was significantly improved through the blending of SBR with CR.

• Elastomers and Composites
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• 제6권2호
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• pp.73-79
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• 1971

As a series of the studies of EPDM-Polymer blends, the experiments are concentrated to the investigation of the physical properties of the EPDM-SBR blends. The results are shown as follows: 1. Tensile strength decreased with increase in EPDM contents and the decreasing value was good results than NR blending. 2. It was found that the aging were much improved after blending and experiments data was good results than NR blending.

• Elastomers and Composites
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• 제22권1호
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• pp.11-19
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• 1987

A coil pyrolyzer and processor-controlled gas chromatograph were used for analysis of rubber for compounding ratio of the single and blend rubber vlucanizates. Variables such as sample size, pyrolysis temperature, time allowed for pyrolysis, the column packing material, its length and programmable temperature for gas chromatography were examined to obtain optimum condition for application to NR, BR and SBR blends. By application fixed conditions, three kinds of standard curves were finally obtained from thirty samples of blend vulcanizates which were prepared in the pilot plant, NIRI. It is possible to determine rubber composition and their ratio in NR, BR and SBR products by pyrolysis.

• Elastomers and Composites
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• 제6권2호
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• pp.47-63
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• 1971

We have studied the blending effects of Diene 33R and styrenebutadiene rubber at various blending ratios of 100/0, 70/30, 50/50, 30/70, 0/100, and of carbon black HAF and ISAF at various compounding ratios of 55 PHR, 65 PHR, 75 PHR for tyre tread rubber. As the results, it was found that ; 1. For tyre tread rubber, when the blending ratio, Diene NF 35R/SBR 1778, indicated 30/70, the physical properties we examined were most excellent. 2. Excellent result was obtained in case of carbon black compounding ratio of 65 PHR. The compounding of ISAF made better result than that of HAF for abrasion quantity, tearing strength, and tensile strength. 3. Heat buildup obtained from compounding carbon black HAF indicated low temperature than that from compounding carbon black ISAF. As the compounding amount of carbon black increased, the heat buildup improved. And as the blending amount of Diene NF 35R decreased, the heat buildup dropped. 4. Carbon black was more efficient to SBR than to Diene Rubber. 5. It is a shortage that elongation revealed low price.

• Elastomers and Composites
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• 제38권2호
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• pp.103-121
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• 2003

The application of powerful ultrasound to rubber recycling is a very recent field of study. An ultrasonic field creates high frequency extension-contraction stresses by acoustic cavitation. The breakdown of rubber network occurs primarily around pulsating cavities due to the highest level of strain produced by high-power ultrasound. Stronger reductions of cross-link density were observed at a higher pressure, indicating an important role of pressure during ultrasonic recycling. Visible bubbles were observed during ultrasonic treatment as a proof of acoustic cavitation. Shearing effect has a significant influence on improving the efficiency of ultrasonic treatment. After the ultrasonic treatment, the cross-link densities of NR/SBR blends were lower than those of NR and SBR due to the reduced degree of unsaturation and chemical reactions. Carbon black fillers increase the probability of bond scission during ultrasonic treatment, due to the restricted mobility. The mechanical properties of ground tire rubber (GRT)/HDPE blends were improved by ultrasonic treatment and dynamic revulcanization. Ultrasonic treatment of GRT in the presence of HDPE matrix was found to give better mechanical properties due to the chemical reactions between rubber and plastic phases.

• 접착 및 계면
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• 제2권4호
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• pp.32-38
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• 2001

본 실험에서는 공가류와 내오존성을 동시에 만족하는 고무 조성비의 영향에 대하여 검토하였다. 사용한 시편은 NR, SBR, BR, IIR 및 EPDM을 다양한 비율로 블렌딩 한 고무 조성물(시편 A), NR/BR/SBR로 구성된 불포화 고무 조성물(시편B)와 NR/IIR/EPDM로 구성된 포화 고무 조성물(시편C)이다. 시편A와 시편B, 시편A와 시편C를 각각 공가류시켜 PAD 접착 시편을 제작하여 박리강도를 측정하였다. 또한 시편A에 대해서 내오존성을 평가하였다. 시편 A의 불포화 고무 조성중(NR/BR Blend)에 BR보다 NR의 비율이 높을수록 시편B와 시편C와의 접착 강도가 높았고, 또다른 불포화 고무 조성(NR/SBR)에서는 NR보다 SBR 함량이 높을수록 접착 강도는 높았다. 또한 시편A의 조성중에서 NR/BR/IIR/EPDM 조성물 보다 NR/SBR/IIR/EPDM 조성물이 접착성이 우수하였다. 고무 조성중 불포화 고무가 많을수록 접착 강도는 우수하였으나, 내오존성은 다소 열세였다. 불포화 고무와 포화 고무의 비율이 60/40 정도 일 때 접착 강도와 내오존성이 모두 양호하였다.

• 대한화학회지
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• 제7권2호
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• pp.115-121
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• 1963

Aliphatic hydrocarbon gases from rubber pyrolysis have been identified by gas chromatography with tetraethyleneglycol dimethylether column. Rubbers used in this work are polyisoprene, SBR, NBR, polybutadiene, buthyl rubber, polychloroprene and polyurethane rubber. The chromatogram is characteristic for each polymer. Author proposes a method of identification of synthetic rubbers by gas chromatograph of pyrolyzed gas. Sample is pyrolyzed at $450^{\circ}C$ under nitrogen or more effectively helium and gaseous portion, which eliminated liquid condensate, is passed to the column. The appearance of exclusively large peak of isoprene, isobutylene and carbon dioxide shows the presence of polyisoprene, polyisobutylene and polyurethane, respectively. Large peak of butadiene will appear in case of polybutadiene, SBR and NBR, but SBR can be identified through the styrene peak in gas chromatogram of liquid pyrolyzate and NBR can be identified by the evolution of hydrogen cyanide during pyrolysis. Polychloroprene is identified by the evolution of hydrogen chloride. This method could be applied to the identification of copolymer or polymer blend.

• Elastomers and Composites
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• 제55권3호
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• pp.161-166
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• 2020

On the basis of the use of shoes, the outsole, which is mainly made of rubber, has various characteristics. The most important of these characteristics is abrasion resistance and friction. Generally, the abrasion resistance can be improved by adding more reinforcing filler such as silica to the rubber; however, the friction force drops. Owing to these problems, rubber having excellent abrasion resistance and rubber having excellent frictional force are blended. In this study, various characteristics, including wear resistance and friction, were evaluated by blending NBR/SBR or NBR/BR mixture with high wear resistance and CIIR with high friction. The CIIR was increased up to 60 phr, whereas the friction wear characteristics were rapidly changed in the NBR/CIIR blend ratio from 75:15 to 60:30.

• Elastomers and Composites
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• 제33권5호
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• pp.324-334
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• 1998

방수재로 사용하는 EVA 에멀젼 수지에 라텍스 형태의 아크릴 수지, 에폭시 수지, 우레탄 수지, SBR 수지를 $0{\sim}50%$ 혼합하여 점성, 건조특성, 경도 등을 실험하였다. 점도는 라텍스함량 20%까지는 현저하게 떨어졌고 그 이상에서는 유사한 점도를 나타내었는데 점도에 가장 영향을 미치는 것은 EVA 수지와의 상용성이었다. 가사시간은 혼합 후 $30{\sim}40분$ 이내인 것으로 나타났는데 가사시간에 가장 영향을 미치는 요인은 시멘트와의 반응성이었다. 지촉건조시간은 에폭시>SBR>우레탄>아크릴의 순서로 나타났는데 수지의 종류와 시멘트의 양에 따라 다른 특성을 나타내었다. 라텍스 혼합물의 경도는 연필경도 $4B{\sim}H$를 나타내었는데 시멘트를 충전했을 때 현저하게 높은 경도를 나타내었다.

• Elastomers and Composites
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• 제52권4호
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• pp.242-248
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• 2017

Wet masterbatch (WMB) technology is studied to develop high-content and highly disperse silica-filled compounds. This technology refers to the solidification of surface-modified silica with a rubber solution or latex. Until now, researchs based on styrene butadiene rubber (SBR)/silica WMB has been mainly performed. However, the blending of SBR/silica WMB and BR is not known and is currently under research and development. Therefore, in this study, the BR blending method suitable for emulsion (ESBR)/silica WMB is investigated by measuring their cure characteristics and the mechanical and dynamic viscoelastic properties. As a result, it was confirmed that the blending of ESBR/silica WMB and BR/silica dry masterbatch is most appropriate. However, it showed a disadvantage compared with the conventional mixing method, which was due to the surfactant remained and the sulfuric acid used as the coagulant.