Abstract
Cyclic natural rubber have low compatibilities when mixed with other polymer. The compatibility of a cyclic natural rubber (CNR) could be increased through grafted functional monomer to the polymer backbone. This research aims to know about influence of maleic anhydrate concentration (3-15 phr) as monomer, concentration of benzoyl peroxide (0.05-0.2 molar ratio) as initiator and times (15-90 minute) towards grafting degree of maleic anhydride. The research conducted with reflux in oil bath, at constant temperature 110ºC. The grafting degree determined with titration method and FTIR analysis used to show the existence of grafted maleic anhydrate onto cyclic natural rubber. Result of FTIR analysis showed that grafted anhydrate to cyclic natural rubber assigned with the presence of carbonyl absorptions (C=O stretching). Result titration showed that concentration of maleic anhydrate and benzoyl peroxide enhanced as well as grafting degree. While for variation of time, optimum grafting degree achieved at 60 minute. Keywords: Grafting; inisiator; natural rubber; polymer
Highlights
Cyclic natural rubber is derivative material from natural rubber, it becomes prime product from downstream of rubber industry
Effect of maleic anhydrate (MA) concentration on the grafting degree and grafting efficiency The graph of grafting degree versus MA concentration is given in Fig 1 and Fig 2
The graph shows that grafting degree increase with increasing MA concentration
Summary
Cyclic natural rubber is derivative material from natural rubber, it becomes prime product from downstream of rubber industry. Cyclic natural rubber widely used in commercial applications as adhesive, printing inks, industrial and ship paints. Cyclic natural rubber is produced from natural rubber by treatment with strong acids or Friedel-Crafts catalyst. Study about cyclic natural rubber structure that produced can be in the form of mono-, bi-, polycyclic. This matter depend on reaction condition and the nature of the solvent (Golub et al 1963; Saunders, 1988; Mojgan, 2000; Riyajan et al 2006; Sitanggang et al 2016)
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