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alkene
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alkene

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The alkenes ethene (C2H4), propene (CH3CH=CH2), and butene (C4H8). Alkenes all have the general formula CnH2n.

Member of the group of hydrocarbons having the general formula CnH2n, formerly known as olefins. Alkenes are unsaturated compounds, characterized by one or more double bonds between adjacent carbon atoms. Lighter alkenes, such as ethene and propene, are gases, obtained from the cracking of oil fractions. Alkenes readily take part in addition reactions, and many useful compounds, such as polythene and bromoethane, are made from them.



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Key statement: A rubber composition comprising (A) an organopolysiloxane end-capped with alkenyldialkylsiloxy, radicals and free of aliphatic unsaturation, (B) an organipolysiloxane containing three alkenyl radicals on molecular side chains, (C) an organohydrogenpolysiloxane, (D) fumed silica and (E) an addition reaction catalyst forms a seal member having improved strength and reduced compression set and useful for sealing a polymer electrolyte fuel-cell separator.
Polymer electrolyte fuel-cell separator sealing rubber composition by Samples, Bob / Rubber World
The characteristic difference between AOSA and ASA is that for AOSA compounds the succinic anhydride groups are always linked to the center of the alkenyl chains.
Summaries of July 2004 peer-reviewed papers by Solutions - for People, Processes and Paper
Key statement: Comprising (A) a straight-chain fluoropolyether having at least two alkenyl groups and a perfluoropolyether structure, (B) an organosilicon compound having at least two Sill groups, (C) a perfluoroparaffin or derivative and (D) a hydrosilylation catalyst cures into a product that exhibits solvent resistance, chemical resistance, weather resistance, water repellency, oil repellency and heat resistance, and is improved in mold release and compression set.
Curable fluoropolyether rubber compositions and rubber articles by Samples, Bob / Rubber World
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