Chemistry Reference
In-Depth Information
research work dealing with rosin and turpentine as sources of monomers or additives
for epoxy resins, epoxy curing agents and polyurethanes.
3.2 Terpene Epoxy Resins and their Polyol Derivatives
Terpene oligomers can be used as a feedstock to produce alicyclic epoxy resins [4].
One epoxy resin was prepared by reacting epichlorohydrine (EC) with the adduct
of oligomeric terpene with maleic anhydride (MA). The addition reaction of terpene
oligomer with MA was carried out at 190 ± 5 ℃ by using 1.5% phosphoric tungstenic
acid monohydrate as a catalyst. The adduct of oligomeric terpene with MA is a solid
(softening point 31 °C) and the yield is 81%. The epoxy resin was prepared from the
anhydride adduct, EC, sodium hydroxide and a phase transfer catalyst. The epoxy
group content of the epoxy resin was 0.44 mol per 100 g resin. This kind of epoxy
resin is a solid at room temperature with a softening point of 26 ℃. The preparation
of the epoxy resin is shown in
Figure 3.1
.
O
Cl
O
O
O
O
O
190 °C
NaOH
O
Oligomer terpene
O
O
O
O
O
O
Figure 3.1
The preparation of the epoxy resin from terpene oligomer adduct with
maleic anhydride
Another alicyclic epoxy resin with an endocyclic structure, hydrogenated terpinene-
maleic ester type epoxy resin (HTME), was synthesised from hydrogenated terpinene-
maleic anhydride (HTMA) by Wu [5]. HTMA was obtained by hydrogenating the
adduct of dipentene and MA in an autoclave. The synthesis method of HTME was
elucidated by studying the effects on the synthesis reaction of the ratio of reactants,
