ENR contains epoxy groups
on the back bone of isoprene.
1] was identified with some reasonable certainty as being due to epoxy groups
and a second band at 1155-1070 [cm.
1)] H NMR), it was determined that 100% of the vinyl groups were converted to epoxy groups
The peaks at 45 and 50 ppm for epoxy group
and at 59, 70, and 72 ppm for mPEG molecule indicated that epoxy group
and mPEG were incorporated into the structure of GC resins.
conversion ([alpha]) values were determined on the basis of the signal at 910 [cm.
The formulation with a weight ratio CNE/ BCDE/TAS of 60/40/5 was found to have the highest cure rate and the greatest final conversion of epoxy groups
upon UV exposure.
1] in the spectrum of curve a assigned to the epoxy group
stretching also disappeared as the crosslinking of epoxy resin increased.
Epoxy resin has been used to precrosslink WPU based on the reaction between the isocyanate-terminated prepolymer with the epoxy group
and hydroxyl group of the epoxy resin.
at least one epoxy resin having more than one epoxy group
, and b.
The reactant compositions were mixed according to the principle that the aromatic amine reacted twice with the epoxy group
The hardener is prepared by a process comprised of reacting a mixture comprised of at least one epoxidized polyalkylene oxide selected from the group of epoxidized polyethylene oxides, epoxidized polypropylene oxides, epoxidized polyethylene propylene oxides and mixtures thereof; at least one epoxidized aromatic hydroxy compound selected from the group of bisphenol A epoxides, bisphenol F epoxides and mixtures thereof; and at least one aromatic hydroxy compound selected from the group of bisphenol A, bisphenol F and mixtures thereof, to form an intermediate product; and introducing an excess amount of polyamine sufficient for the reaction of one molecule of polyamine with each epoxy group
in the intermediate product, and reacting the intermediate product with the polyamine.
This significant change in the characteristics of NR was brought about by the presence of epoxy group
in the main chain of the elastomer.