The mixture was heated to the prescribed temperature of 120 to 140[degrees]C, the required amount of catalyst was introduced [C.sub.c] [approximately equal to] 0.025 mol/kg, and after 2 min a sample was taken to determine the epoxy groups
However, when reactions did not result in rubbery material, FTIR was used to determine the depletion of the epoxy group
which signifies the end of the reaction.
This is because the basal planes and edges of chemically treated graphite sheets are modified with oxygen-containing functional groups such as hydroxyl, carboxyl, and epoxy groups
, which greatly increase the interlamellar spacing and destroy the original crystal structure of graphite.
Examples are epoxies with hydroxy and epoxy groups
with acid anhydride groups and transesterification catalysts.
Epoxy resins belong to a class of thermosetting materials containing two or more oxirane rings or epoxy groups
in their molecular structure.
All of the synthesized compounds showed additional absorption bands around 1260, 1165, and 890 [cm.sup.-1] associated with epoxy groups
, although a band at 1260 [cm.sup.-1] was identified with some reasonable certainty as being due to epoxy groups
and a second band at 1155-1070 [cm.sup.-1] was probably due to [CH.sub.2]-O vibrations when compared with the parent Schiff base ligand.
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.
The theoretical epoxy group
in copolymer microspheres was dependent on GMA content in the monomer form.
% or more of an isoprene monomer unit and the other is an active terminal, the agent having, per molecule, at least one of an epoxy group
and a hydrocarbyloxysilyl group and being that a total number of the epoxy groups
and hydrocarbyloxy groups in the hydrocarbyloxysilyl groups per molecule is three or more.
CCP Composites US LLC has been granted a patent for a thermosetting, crosslinkable resin composition suitable for preparing a gel coat, the composition is comprised of: a polyester acrylic polymer having an average of more than two polymerizable carbon-carbon double bonds in each molecule, the carbon-carbon double bonds in the polyester acrylic polymer being from a reaction product of a saturated polyacid half-ester having an average acid functionality of two or more and an unsaturated epoxide monomer in about chemically equivalent amounts to furnish one epoxy group
per carboxyl group, the saturated polyacid half-ester being the reaction product of one or more polyols having an average of at least two hydroxy!
The epoxy group
is a very versatile functionality for producing coatings since curing can be accomplished by a variety of methods including amine-cure, anhydride-cure, and cationic photocure.
In high-temperature blending or extrusion compounding, the maleic anhydride in the 4700 grade reacts with the free amine of nylon, while the glycidyl methacrylate epoxy group
of the 8660 grade reacts with the free carboxylic acid groups of polyester.