A crosslinking molecule has a carbon-carbon double bond
at its head, but unlike a normal monomer molecule it also has up to three additional carbon-carbon double bonds
at other ends of the molecule; this means that the crosslinker will form bonds at more than one site, which enables the crosslinker to bind separate chains together and form a more rigid structure for the final polymer.
Key statement: A modified diene polymer is obtained by decomposing a diene polymer having a carbon-carbon double bond
in a main chain by oxidative cleavage of the carbon-carbon double bond
to reduce a molecular weight, changing acido-basic properties of a system containing polymer fragments obtained such that the system is changed into a basic system when the system is acidic and the system is changed into an acidic system when the system is basic to combine the polymer fragments, thereby obtaining an intermediate polymer having an altered structure, and epoxidizing a carbon-carbon double bond
moiety of a main chain of the intermediate polymer.
Unsaturated groups (such as carbon-carbon double bond
content) in the rubber molecule react with oxygen and ozone.
12-15) Because FTIR measurements of DC use the aromatic carbon-carbon double bond
peak as internal standard, variations in comonomer blend composition and ratio can influence the results.
Catalytic hydrogenation indicated the presence of one carbon-carbon double bond
By targeting the carbon-carbon double bond
, which is usually difficult to break, metathesis reactions provide "a new way to link molecules together," says Ronald Breslow, a chemist at Columbia University and Grubbs' Ph.
Key statements polymer having a carbon-carbon double bond
in a main chain is decomposed by subjecting the carbon-carbon double bond
to oxidative cleavage using an oxidizing agent such as periodic acid to decrease the molecular weight, polymer chains of the decomposed polymer are combined by changing acido-basic properties such that a system containing the decomposed polymer becomes basic when acidic and becomes acidic when basic, and a modified polymer in which the structure has been changed is obtained.
Ceramides (sphingolipids) are molecules having: a sphingoid amidic base (14-22), and are mostly decorated with hydroxyl functions and carbon-carbon double bond
(s), attached to a long chain fatty acid (14-30 carbon atoms), which may saturated or unsaturated .
The carbon-carbon double bond
in MAPTMS is reactive toward free-radical polymerization, and the Si-OR groups can be hydrolyzed leading, in principle, to better interactions with siloxane chains.
A rubber composition comprising: (A) a conjugated diene rubber which is obtained by polymerizing a conjugated diene compound or polymerizing a conjugated diene compound and an aromatic vinyl compound and has a group having an active hydrogen and a group capable of chemically binding to a silica, (B) a silica, (C) a silane coupling agent (1) capable of reacting with a carbon-carbon double bond
of the conjugated diene in the conjugated diene rubber, and (D) a silane coupling agent (II) capable of reacting with the group having an active hydrogen; a method for producing a rubber composition, which comprises mixing the above-mentioned composition; and a tire which is obtained by crosslinking and molding the rubber composition obtained by the method for production.