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trigger for transplantation reactions (copolymeriza-
tion grafting) is when the initiator decomposes into
free radicals and there are one or more unpaired elec-
trons. The oleic acid (AO) grafting process (AO) into
the cyclic natural rubber molecule chain can occur
when AO monomers attach and form covalently
branching to the main chain of cyclic natural rubber
molecules when the polymer becomes radical by the
presence of an initiator. In the early stages of initiator
dicumyl peroxide (DKP) will form free radicals that
will attack the CNR polymer chain, so that cyclic nat-
ural rubber free radicals will be formed, then the cy-
clic natural rubber free radicals that form will initiate
the process of transplanting oleic acid into the natural
rubber molecule chain cyclical.
4 CONCLUSIONS
Based on the results of the research that has been
done, a conclusion can be drawn as follows:
a) Modification of cyclic natural rubber with oleic
acid using dicumyl peroxide and divinylbenzene
in an internal mixer with a temperature of 160 oC
and a rotor speed of 80 rpm using the graft copol-
ymer method has been successfully carried out.
This can be proven from the results of FT-IR spec-
tra analysis of emerging new absorption peaks at
wave number 1705.07 cm-1 which is a typical ab-
sorption of oleic acid indicating the presence of vi-
brations of the C=O bond of asymmetric carbonyl
groups originating from oleic acid.
b) The amount of oleic acid grafted on cyclic natu-
ral rubber increases with increasing concentra-
tion of oleic acid monomers in the presence of
dicumyl peroxide initiators and the addition of
divinylbenzene comonomers. The maximum
percent degree of grafting is 0.2630 % at the con-
centration of oleic acid monomers 9 phr.
c) The transition temperature of cyclic natural rubber
glass before grafted with oleic acid was 102.86
o
C
but after the graft process was carried out using the
initiator dicumyl peroxide and divinylbenzena the
glass transition temperature decreased to 83.98
o
C
this proves that the graft process of oleic acid into
the chain of cyclic natural rubber molecules has
been successfully carried out with the formation of
a new product CNR-g-AO
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