Vol 8, No 3 (2017) > Metalurgy and Material Engineering >

Characterization of Hydrogenated Natural Rubber Synthesized by Diimide Transfer Hydrogenation

Adi Cifriadi, Mochamad Chalid, Santi Puspitasari

 

Abstract: Oxidation resistance and
thermal stability of natural rubber (NR) can be improved by diimide transfer
hydrogenation in the latex phase. In this research, non-catalytic diimide
transfer hydrogenation of concentrated NR latex was accomplished at various
proportions of hydrazine hydrate/hydrogen peroxide. The system was stabilized with
the addition of sodium hydroxide. Hydrogenated natural rubber (HNR) was
characterized by Fourier Transform Infra Red analysis and degree of
hydrogenation. The possibility of side reactions during hydrogenation was also
studied by analyzing the gel content and particle size distribution of HNR. It
is known that the highest degree of hydrogenation is obtained from the addition
of 2 phr hydrazine hydrate and 3 phr hydrogen peroxide at 70oC for a
5-hour diimide transfer hydrogenation of concentrated natural rubber latex,
preserved with 1 phr of sodium hydroxide. The higher concentration of hydrogen
peroxide trigger crosslink reaction of non-rubber constituent, and
depolymerization of HNR molecular chains, were shown by the increased gel
content and reduction of HNR particle size distribution, respectively.
Keywords: Diimide; Hydrogenation; Natural rubber

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