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
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 , 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.
041 (93) Systems Samples Total epoxy group
converted number Initial rate After 1.
These maximum values of epoxy group
conversion were presumably limited by the vitrification of network which inhibited any further progress of the reaction.