epoxy group


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epoxy group

(ĕp`ŏksē), in chemistry, functional groupfunctional group,
in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain.
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 that consists of an oxygen atom joined by single bonds to two adjacent carbon atoms, thus forming the three-membered epoxide ring. It is the functional group of epoxides.
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Examples are epoxies with hydroxy and epoxy groups with acid anhydride groups and transesterification catalysts.
1] was identified with some reasonable certainty as being due to epoxy groups and a second band at 1155-1070 [cm.
According to Fisch and Hofmann (1961, 1954) anhydride does not react with epoxy groups directly, but the anhydride ring is opened first by reaction with hydroxyl groups.
1)] H NMR), it was determined that 100% of the vinyl groups were converted to epoxy groups.
This is because of the residual oxygen groups may open up the epoxy group of rubber and lead to the formation of strong hydrogen bonding interactions between residual oxygen functionalities of GR and an epoxy group of rubber.
A stoichiometric amount (one epoxy group corresponds to one anhydride group) of the acid anhydride was then added and the mixture was stirred.
GC functional resins are synthesized by the reaction of an isocyanate functional compound with glycidol to yield a carbamate (urethane) linkage (-NHCO-) and reactive epoxy group.
The symmetrical ring breathing vibration of the epoxy group appeared at 1282 [cm.
The present invention is a thermoplastic elastomer composition comprising an ethylene-vinyl alcohol copolymer and a modified rubber dispersed in the ethylene-vinyl alcohol copolymer, wherein the modified rubber has an acid anhydride group or epoxy group and is dynamically crosslinked by a compound having at least two amino groups.
The generally accepted scheme of an amino-epoxy cure involves three main reactions of the glycidyl ether: a primary amine group addition to the epoxy ring, a secondary amine group addition, and the etherification [40], This is an autocatalytic process because the hydroxyl molecules formed as one of the reaction products partly protonate the oxygen atom of the epoxy group, facilitating the ring-opening reaction.
These maximum values of epoxy group conversion were presumably limited by the vitrification of network which inhibited any further progress of the reaction.