Staff Publications
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Item Quality improvement of radiation vulcanized natural rubber latex by addition of polyvinyl alcohol and centrifugation(Rubber Research Institute:Agalawatta, 1999) Ratnayake, U.; Makuuchi, K.; Yoshii, F.Effect of polyvinyl alcohol(PVA)on extractable soluble protein content,and on mechanical and physical properties of radiation vulcanized natural rubber latex(RVNRL)was studied with the view of improving properties of RVNR latex.Concentrated natural rubber latex was irradiated at the rate of 10 kgy/h for 2hrs in the presence of 5 phr of n-BA and 0.5 phr of KOH.PVA solution was added to the RVNR latex at three different stages and different time periods were used for leaching to find out the most suitable process to produce soluble protein less RVNR latex.present results indicate that combined treatments of PLVA addition and centrifugation foollowed by leaching were more effective compared to single treatmemt to reduce soluble protein content in RVNR latex films.It could be further observed that,the tear strength was increased whereas tensile strength and tackiness were decreased with PVA concentration.However when the PVA incorporated RVNRL was centrifuged,tensile and tear strenght were not changed up to 2 phr of PVA.Fourier Transrorm infrared slpectrophotometer (FTIR)measurements showed that whem PVA added RVNRL was centrifuged,most of the PVA could be removed with the serum phase,According to the Horixontal Attenuated Total reflectance(HATR)measurements ,PVA concentration on the upper and lower surfaces of the latex films (I.E.the exposed and unexposed surfaces of the films whem drying )was not equal.Item Blends of acrylonitrile butadiene rubber/superior processing/natural rubber and poly(vinyl chloride) Part I. a study of some of the technological properties of NBR/SP rubber/NR/PVC blends(Rubber Research Institute:Agalawatta, 1999) De Silva, K.G.K.; Karunanayake, L.; Muttukkrishnan, K.The advantage s of using superior processing(SP)rubber in place of natural rubber (NR) in blends with NBR and NBR/PVC is discussed here in derail.various technological properties such as tensile,resilience,hardness,compression set,specific gravity,cross-lind density and resistance to oil were measured and compared. It is advantageous to use SP rubber in place of NR in the above blends probably due to higher cross-link density in the SP rubber component when compared to NR. It may be possible to use the ternary blends of SP/PVC? NBR in manufacture of injection moldable and recyclable products due to their thermoplastic natureItem Improving phase morphology and properties of NR/NBR blends with compatibilizers(Rubber Research Institute:Agalawatta, 1998) De Silva, K.G.K.; Lewan, M.Two compatibilizing agent have been identified for NR/NBR blend to improve the phase morphology and interfaial adhesion, thereby improving the physical and technological properties. Light and optical microscopy and Nuclear Magnetic Resonance have been used to study the phase contrast and crosslink distribution of the elastomer blends respectively, to suport the observations mode on the improvements in the physical properties of these blends.Item Improving phase morphology and properties of NR/NBR blends with compatibilizers(Rubber Research Institute:Agalawatta, 1998) De Silva, K.G.K.; Lewan, M.Two compatibilizing agent have been identified for NR/NBR blend to improve the phase morphology and interfaial adhesion, thereby improving the physical and technological properties. Light and optical microscopy and Nuclear Magnetic Resonance have been used to study the phase contrast and crosslink distribution of the elastomer blends respectively, to suport the observations mode on the improvements in the physical properties of these blends.Item Some studies on cyclization of bromelain treated rubber(Rubber Research Institute:Agalawatta, 1980) Yapa, P.A.J.; Lionel, W.A.Item Effect of varied carbon black distribution on the morphology and properties of blends of natural and nitrile rubber(Rubber Research Institute:Agalawatta, 2003) Edirisinghe, D.; Freakley, P.K.Item Effect of nitrogen and processing chemicals on the treatment efficiency of crepe rubber factory wastewater(Rubber Research Institute:Agalawatta, 2003) Kudaligama, K.V.V.S.; Thurul, W.M.; Yapa, P.A.J.Item Coir. a versatile raw material to produce stationary media for biological wastewater treatment systems(Rubber Research Institute:Agalawatta, 2007) Kudaligama, K.V.V.S.; Thurul, W.M.; Yapa, P.A.J.Item Improvements in performance of polychloroprene rubber based adhesives(Rubber Research Institute:Agalawatta, 2001) De Silva, K.G.K.; Renuka Nilmini, A.H.L.; Dayaratne, D.