In this work, the photopolymerization of Ricinodendron heudelotii (R. heudelotii) oil and methyl methacrylate in presence and absence of iron(III) tris(oxalato) ferrate(III) tetrahydrate (Fe[Fe(C2O4)(3)]center dot 4H(2)O) (A) in N,N'-dimethylformamide under UV radiation of 254 nm at 40 A degrees C has been studied. The rate of polymerization, R (P), varies linearly with the inverse of [A] up to 6.5 x 10(-4) mol L-1 and decreases above this concentration with the increase of [A]. The photoinitiator-free polymerization and polymerization in presence of the Fe(III) photoinitiator exhibit similar polymerization behavior. Thermal analysis of poly(R. heudelotii oil-co-MMA) was investigated by thermogravimetric analysis method. The thermal analysis was performed at five different heating rates. The poly(R. heudelotii oil-co-MMA) synthesized in the presence of the photoinitiator exhibits three stages of decomposition while two stages of decomposition pattern are prominent in photoinitiator-free polymers and for both polymers the main decomposition occurs at temperature range 300-500 A degrees C. The apparent activation energy (E (a)) of the decomposition has been calculated by three non-isothermal methods of Flynn-Wall-Ozawa, Kissinger and modified Coats-Redfern.