• Title/Summary/Keyword: NR/BR blends

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Mechanical Properties of Organoclay filled NR/BR Blends (Organoclay로 보강된 NR/BR Blends의 기계적 특성)

  • Kim, W.;Kim, S.K.;Kim, S.K.;Chuug, K.H.;Byun, J.Y.
    • Elastomers and Composites
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    • v.39 no.1
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    • pp.51-60
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    • 2004
  • The cure, viscoelastic and mechanical characteristics of organoclay filled NR/BR blends were studied and compared with the properties of carbon black and silica filled NR/BR blends. The nanocomposites with extensive exfoliation state can be fabricated by a solution mixing method. In the composites, the amount of filler content was fixed to 10 phr. Degree of intercalation and exfoliation was characterized by X-ray diffraction (XRD). XRD results indicated exfoliation of the silicate layers into the rubber matrix. While the degree or intercalation and exfoliation is lowered by the conventional mixing method, extensive exfoliation can be obtained by the solution mixing method. It was found that the clay filled NR/BR compound showed better viscoelastic (tan ${\delta}$) and mechanical properties than the carbon black or silica filled NR/BR compounds.

Studies on the Quality Reinforcement for Pneumatic Tire and Tube. Part 2. Physical Properties of NR-Syn. R blends. (Tire 및 Tube의 품질(品質) 보강(補强)에 관(關)한 연구(硏究)(제2보(第2報)) 천연(天然) 및 합성(合成)고무의 변량혼합(變量混合)에 따른 이화학적(理化學的) 성능(性能))

  • Kim, Joon-Soo;Lee, Myung-Whan;Yum, Hong-Chan;Lee, Chin-Bum;Park, Chang-Ho;Hong, Chong-Myung;Im, Dong-Ho;Lee, Chong-Koun
    • Elastomers and Composites
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    • v.3 no.1
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    • pp.32-38
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    • 1968
  • The physical properties of NR-SBR and NR-BR blends were studied. 1. In blending, tensile strength decreased with increase in synthetic rubber contents. It was most effective when the ratio of NR/Syn. R is 75/25. 2. Tensile strength decreased with order of NR, SBR and BR and modulus after aging is proportional of synthetic rubber contents. 3. Elongation is less influenced by synthetic rubber ratio that on the other hand, the decrease of elongation is proportional to synthetic rubber contents after aging. 4. Hardness decreased with increase in the synthetic rubber contents and on the other hand, the hardness increased after aging.

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Covulcanization and Ozone resistance for Unsaturated and Saturated Rubbers (불포화 고무와 포화 고무의 공가류 및 내오존성)

  • Lim, Won-Woo;Jung, Il-Taek;Han, Min-Hyun
    • Journal of Adhesion and Interface
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    • v.2 no.4
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    • pp.32-38
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    • 2001
  • Effects of the ratio of rubber composition on covulcanization and ozone resistance were studied in this study. Specimens used in this study were rubber compounds(specimen-A) blended with various ratio of NR, SBR, BR, IIR, and EPDM, unsaturated rubber compounds(specimen-B) with NR/BR/SBR, and saturated rubber compounds(specimen-C) with NR/IIR/EPDM. PAD adhesion specimen was prepared from vulcanizing specimen-A and B, and specimen-A and C, respectively. Using same adhesion specimen, peel strength was measured and tested ozone resistance. In specimen-A, peel strength was higher with increasing NR ratio for NR and BR contained blends. In other specimen-A containing NR and SBR, the peel strength was also increased with increasing SBR ratio. NR/BR/IIR/EPDM rubber compounds had also better adhesion property than NR/SBR/IIR/EPDM compounds. As more unsaturated rubber was blended, the peel strength was higher but ozone resistance was worse. Optimum ratio of unsaturated and saturated rubbers for the peel strength and ozone resistance was 60/40.

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Effect of NR/BR Blends ratio and Oil Content on the Mechanical Properties of Rubber Isolator at Low Temperature (저온환경에서 NR/BR 블렌드 조성비 및 오일함량이 방진고무재료의 기계적 특성에 미치는 영향)

  • Kim, Wan-Doo;Kim, Wan-Soo;Woo, Chang-Soo;Choi, Sung-Seen
    • Elastomers and Composites
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    • v.39 no.2
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    • pp.95-104
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    • 2004
  • New compounds were made using various NR/BR blend ratio and oil content to improve mechanical properties of rubber isolator at low temperature. Mechanical properties were investigated as a function of NR/BR blend ratio and oil content. Hardness and tensile modulus generally increased, but tensile strength and elongation at break decreased with increasing BR content. Hardness, tensile modulus and tensile strength decreased, but elongation at break were nearly the same with increasing oil content. The glass transition temperature of NR and BR were found to be $-50^{\circ}C$ and $-90^{\circ}C$ respectively based on the abrupt drops in storage elastic modulus and peak of loss factor. Two distinct transition temperature were observed in NR/BR blend compounds and each transition point was not affected by blend level indicating incompatible nature of NR/BR blend.

Preblending Effect of Biblends on Properties of the Carbon Black-Filled Rubber Compounds

  • Park, Sung-Seen
    • Macromolecular Research
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    • v.9 no.1
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    • pp.37-44
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    • 2001
  • A premixing effect for the properties of carbon black-filled rubber compounds was investigated using biblends of natural rubber (NR), styrene-butadiene rubber (SBR), and butadiene rubber (BR). Degree of mixing of the biblends was controlled by preblending time of 0.0, 2.5, and 5.0 min. Mooney viscosities of the compounds decreased by increasing the preblending time. Of three carbon black-filled compounds of NR/SBR, NR/BR, and SBR/BR compounds, only the SBR/BR blends showed a specific cure characteristics depending on the preblending time. For the bound rubber composition, the NR content was higher than SBR and BR. The difference in the rubber composition ratio of the bound rubber became smaller with increasing the preblending time. Physical properties of the vulcanizates such as hardness, modulus, tensile property, abrasion loss, and tans were also compared. Differences in properties of the compounds were discussed with miscibility of the dissimilar rubbers and degree of mixing.

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Analytical Method for Determination of Microstructure of SBR and SBR Content in Blended Rubber Composites Using Pyrolytic Technique

  • Eunji Chae;Sung-Seen Choi
    • Elastomers and Composites
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    • v.57 no.4
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    • pp.188-196
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    • 2022
  • Styrene-butadiene rubber(SBR) is a copolymer of styrene and butadiene. It is composed of 1,2-unit, 1,4-unit, and styrene, and its properties are dependent on its microstructure. In general, rubber composites contain a single rubber or a blended rubber. Similarly, SBR is used by mixing with natural rubber(NR) and butadiene rubber(BR). The composition of a rubber article affects its physical and chemical properties. Herein, an analytical method for determining the microstructure of SBR using via pyrolysis is introduced. Pyrolysis-gas chromatography/mass spectrometry is widely used to analyze the microstructure of polymeric materials. The microstructure of SBR can be determined by analyzing the principal pyrolysis products formed from SBR, such as 4-vinylcyclohexene, styrene, 2-phenylpropene, 3-phenylcyclopentene, and 4-phenylcyclohexene. An analytical method for determining the composition of SBR/NR, SBR/BR, and SBR/NR/BR blends via pyrolysis is introduced. The composition of blended rubber can be determined by analyzing the principal pyrolysis products formed from each rubber component.

Study on Analysis of Vulcanized Rubber by Pyrolysis-Gas Chromatography(I) (Vulcanizates of NR BR and SBR) (Pyrolysis-Gas Chromatography를 이용한 가황 고무의 열분석에 관한연구(I) (NR, BR 및 SBR의 가황체))

  • Huh, D.S.;Kim, J.S.;Kim, K.J.;Ahn, B.K.;Suh, S.K.;Han, O.K.
    • Elastomers and Composites
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    • v.22 no.1
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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.

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Foaming Behavior, Structure, and Properties of Rubber Nanocomposites Foams Reinforced with Zinc Methacrylate (아연 메타아크릴레이트로 보강된 발포고무 나노복합체의 발포거동, 구조 및 특성)

  • Basuli, U.;Lee, G.B.;Jang, S.Y.;Oh, J.;Lee, J.H.;Kim, S.C.;Jeon, N.D.;Huh, Y.I.;Nah, C.
    • Elastomers and Composites
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    • v.47 no.4
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    • pp.297-309
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    • 2012
  • Different amounts of foaming agents were employed in natural rubber(NR)/butadiene rubber(BR) blends to understand the foaming behavior in presence of nano-reinforcing agent, zinc methacrylate (ZMA). The ZMA greatly improved most of the mechanical properties of the rubber foams, however it did not show considerable effect on the cell morphology, such as cell size, density and porosity. It was also observed that the foaming agent concentration affected all the mechanical parameters. When the content of foaming agent was increased, the number of foams was increased leading to a decrease in density of the compounds. But the size and distribution of foams remained unchanged with increased foaming agent. The effect of high styrene-butadiene rubber (HSBR) was also studied. The size of cells became smaller and the cell uniformity was improved with increasing HSBR. The foam rubber compounds showed much efficient energy absorbing capability at higher strains.