• Title, Summary, Keyword: olefin

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Olefinic Thermoplastic Elastomer and Styrenic Thermoplastic Elastomer (올레핀/스티렌 열가소성 탄성체 및 올레핀/$\alpha$-올레핀 열가소성 탄성체)

  • Kim, Dong-Hyun;Kim, Hyun-Joon;Lee, Bum-Jae
    • Elastomers and Composites
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    • v.45 no.3
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    • pp.152-155
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    • 2010
  • Olefinic thermoplastic elastomer and styrenic thermoplastic elastomer have broad hardness range, high flexibility, low density, and excellent recyclability. But, they are limited in applications due to their low elasticity and low operating temperature. To overcome these problems, olefin/styrene or olefin/$\alpha$-olefin copolymers have been developed. In this review, we described some examples of olefin/styrene or olefin/$\alpha$-olefin copolymer and introduced their properties. Although olefin/styrene or olefin/$\alpha$-olefin copolymer have various weaknesses, they have a great potential in the future.

Insight into Complexation of Olefin with Silver Ions Dissolved in Poly(n-butyl methacrylate)

  • Dongkyun Ko;Lee, Kyung-Min;Lee, Kwi-Jong;Kang, Yong-Soo
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.136-139
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    • 2004
  • Olefin/paraffin separation by the facilitated transport membrane using silver salts as carriers has been considered as a promising alternative to the conventional energy intensive distillation process. The basis for the separation is the ability of silver ions to react reversibly with olefin forming silver-olefin complexes.(omitted)

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Effects of the Chain Length of High α-olefins on the Terpolymerization (High α-olefin의 사슬길이가 삼원공중합에 미치는 영향)

  • Kim, Tae-Wan;Lee, Jun Chul;Park, No-Hyung;Kim, Hyun Ki;Cho, Ur-Ryong;Kim, Dong Hyun
    • Elastomers and Composites
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    • v.47 no.4
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    • pp.329-335
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    • 2012
  • In this study, we synthesized poly(ethylene-ter-high ${\alpha}$-olefin-ter-p-methylstyrene) using Zr metallocene catalyst/borate type cocatalyst system. Various effects of the high ${\alpha}$-olefin (1-hexene, 1-octene, 1-decene, and 1-dodecene) were observed. The structure and composition of the terpolymers were characterized using $^{13}C$ NMR and $^1H$ NMR. Catalytic activity, polymer yield, molecular weight and molecular weight distribution were analyzed according to the chain length of high ${\alpha}$-olefin. We determined morphology, crystallinity and thermal properties of the terpolymers.

Silver Polymer Electrolyte Membranes for Facilitated Olefin Transport: Carrier Properties, Transport Mechanism and Separation Performance

  • Kim, Jong-Hak;Kang, Yong-Soo
    • Macromolecular research
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    • v.12 no.2
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    • pp.145-155
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    • 2004
  • Facilitated transport membranes for the separation of olefin/paraffin mixtures have long been of interest in separation membrane science because olefins, such as propylene and ethylene, which are important chemicals in petrochemical industries, are currently separated by energy-intensive cryogenic distillation processes. Recently, solid polymer electrolyte membranes containing silver ions have demonstrated remarkable performance in the separation of olefin/paraffin mixtures in the solid state and, thus, they can be considered as alternatives to cryogenic distillation. Here, we review recent progress, and critical issues affecting in the use of facilitated olefin transport membranes; in particular, we provide a general overview with reference to carrier properties, transport mechanisms, and separation performance.

The Effect of Olefin Contents on Exhaust Emissions from Gasoline Vehicles (휘발유 차량에서 배출가스에 미치는 올레핀의 영향)

  • Park, Cheonkyu;Jung, Choongsub;Na, Byungki
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.2
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    • pp.37-43
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    • 2014
  • Exhaust emissions were studied as a function of gasoline olefin composition in two vehicles-MPI and GDi engine equipped vehicles. Three different gasolines were tested which varied in olefin contents-12, 16 and 20 vol%. Exhaust emissions in two vehicles were affected by changes in gasoline olefin composition. Responses to changes in olefins were similar in both vehicles : reducing olefins lowered emissions of NOx and CO. Measured exhaust emissions included total hydrocarbons (THC), oxides of nitrogen (NOx), carbon monooxide(CO), carbon dioxide($CO_2$), formaldehyde, benzene, toluene, xylene, 1,3-butadiene and acetylene.

Properties of the Blends of Ethylene-Vinyl Acetate and Ethylene-$\alpha$-Olefins Copolymers

  • Park Soochul;Yim Chaiseok;Lee Byung H.;Choe Soonja
    • Macromolecular research
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    • v.13 no.3
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    • pp.243-252
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    • 2005
  • The effect of the vinyl acetate (VA) content on the thermal, viscoelastic, rheological, morphological and mechanical behaviors in various blends of ethylene-vinyl acetate (EVA)/ethylene-$\alpha$-olefin copolymers was investigated using 28, 22 and $15 mol\%$ of VA in EVA. In the DSC melting and crystallization thermograms of all of the EVA systems blended with ethylene-$\alpha$-olefin copolymers, discrete peaks were observed which were related to the constituents. In the dynamic mechanical thermal analysis, the storage modulus increased with increasing content of ethylene-$\alpha$-olefin copolymers. In addition, the transition regions relating to the tan bpeaks varied with the VA content. The crossover point between G' and G" varied depending on the VA contents, and shear-thinning was more prominent in the EVA/EtBC system. In the SEM investigation, a discrete phase morphology was observed in both the EVA/EtBC and EVA/EtOC blends, but the contrast improved with decreasing VA content. However, the tensile strength and modulus improved, but the elongation at break reduced with decreasing VA content, implying that the ethylene-$\alpha$-olefin copolymers play the role of reinforcing materials. Thus, the EVA and ethylene-$\alpha$-olefin components in the copolymers are immiscible in the molten and solid states, but are nevertheless mechanically compatible.