Journal of the Rubber Research Institute of Sri Lanka
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Item Chemical modification of natural rubber(Rubber Research Institute. Agalawatta, 1991) Pushpa, S.A.; Goonetilake, P.; Silva, S.M.C.E.; Witharana, L.P.; Denawake, I.Item Economics of reinvestment on rubber in the estate sector(Rubber Research Institute. Agalawatta, 1997) Samarappuli, I.N.; Wickramaratne, C.S.; Dias, D.G.S.Replanting of rubber is considered as a long term investment.This study investigates the financial viability of reinvestment on rubber with especial reference to estate sector in Sri Lanka.Economic life span of a 33 vear period is considered for the discounted cash flow analysis.The sample consisted of 135 rubber fields randomly selected from 15 large estates. The discounted cash flow analysis revealed a NPV of Rs.65,700 at 15% discount rate.The B/C ratio.Net Nenefit-investment ratio.IRR and pay Back period were 1.35.2.80.22 and 11 years respectively.Certain parameters were varied through sensitivity analysis to assess the economic viability of reinvestment on rubber under different scenarios.Item Kinetic study of the graft polymerization of unsaturated monomers with natural rubber latex and with deproteinized natural rubber latex(Rubber Research Institute. Agalawatta, 1994) De Silva, K.G.K.; Hamielec, A.E.The non-rubber substances present in natural rubber (NR) latex seem to have an influence on the rate of polymerization reaction, degree of grafting grafting efficiency of the graft copolymerization reaction of Methyl Methacrylate on to natural rubber.The released amino acids on enzymatic destruction of phospholipid/protein barrier in natural rubber latex may probably by the cause for the improvement of the reaction kinetics; such that reaction under redox conditions could be conducted without purification of the monomer with inhibitors. Presence of emulsifier, type of enzyme, monomer diffusion time in rubber particle, size of the particle are shown to have an influence on the physical properties of the final product.H NMR has been used to study the composition of the final product.Item The preparation and properties of low nitrogen constant viscosity rubber(Rubber Research Institute. Agalawatta, 1975) Yapa, P.A.J.Item Graft polymerisation of natural rubber(Rubber Research Institute. Agalawatta, 1973) Selvaratnam, M.; Suseeladevy, S.; Sotheeswaran, S.Item Some aspects of phenolic discolouration in natural rubber(Rubber Research Institute of Sri Lanka. Agalawaththa, 1976) Yapa, P.A.J.Item The proteolytic action of papain on proteins in Hevea latex(Rubber Research Institute of Sri Lanka. Agalawaththa, 1974) Yapa, P.A.J; Balasingham, C.G.Item Can tapping panel dryness of rubber (Hevea brasiliensis) be minimised at field level with better management?(Rubber Research Institute . Agalawatta, 2007) Senevirathna, A.M.W.K.; Wilbert, S.; Perera, S.A.P.S.; Wijesinghe, A.K.H.S.Item Some studies on cyclization of bromelain treated rubber(Rubber Research Institute. Agalawatta, 1980) Yapa, P.A.J.; Lionel, W.A.Item A note on a simple method of control of latex coagulation(Rubber Research Institute. Agalawatta, 1959) Heinisch, K.F.