Browsing by Author "De Silva, K.G.K."

Now showing 1 - 11 of 11

Analysis of extractable proteins in rubber products
(Rubber Research Institute. Agalawatte, 1996) De Silva, K.G.K.
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 nature
Depolymerized natural rubber as a processing aid
(Rubber Research Institute of Sri Lanka. Agalawatte, 1996) De Silva, K.G.K.; Silva, S.M.C.E.; Vitharana, L.P.
The development of a commercially viable, light coloured, non toxic grade of depolymerized natural rubber by the Rubber Research Institute of Sri Lanka (proprietary) has led us to carry out research and development work on the potential industrial applications of depolymerized rubber, for example, as a speciality rubber in raw rubber blends to improve processability and certain physical properties due to its covulcanizable characteristics. The effects of percentage of depolymerized rubber on the processability and vulcanization characteritics are discussed in this paper. The results show that the use of depolymerized rubber in controlled amount enhances the processability and lowers the power requirement without adversely affecting the properties of the compounds. Also, the results obtained with the vulcanized mixes demostrate that the behaviour of depolymerized rubber is comparable to synthetic polyisoprenes and is an improvement over ordinary processing oils. Results show that the incorporation of certain percentages of depolymerized rubber in the formulations can significatly improve the abrasion resistance. Clearly, if depolymerized natural rubber can surpass the existing processing aids in quality and price, then a much larger market is potentially available world wide.
Heat resistant superior processing tellurium rubber
(Rubber Research Institute of Sri Lanka. Agalawatta, 1986) De Silva, K.G.K.
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.
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.
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.
Natural rubber latex based adhesives to bond various materials
(Rubber Research Institute. Agalawatte, 1996) De Silva, K.G.K.
Processing of NR and some developments in rubber chemistry and technology in Sri Lanka
(Rubber Research Institute of Sri Lanka. Agalawatta, 1998) Yogaratnam, N.; Tillekeratne, L.M.K.; De Silva, K.G.K.; Siriwardena, S.; Samarappuli, I.N.
Some basic factors involved in setting up of a dry rubber based products manufacturing industry
(Rubber Research Institute. Agalawatta, 1999) De Silva, K.G.K.
A study of some of the properties of blends of polypropylene and chemical incorporated granular natural rubber
(Rubber Research Institute. Agalawatta, 1994) De Silva, K.G.K.; Ranjith, S.L.G.; Warnapura, S.S.
Thermoplastic elastormers of plastics natural rubber (TPNR) are generally produced by blending plastics with natural rubber (in bale form) using traditional banbury type internal mixers plastics extruders. This involves high energy consumption also high capital costs of both rubber plastics processing machinery. The production of Thermoplastic elastomers on a continuous basis using extruder blenders has been less applicaple to TPNR blends because natural rubber is not readily or widely available in the required granular form in natural rubber consuming countries. The manufacture of different types of granular rubber in our laboratories has not only made possible the blending of thermoplastics with natural rubber on a continuous basis but also paved the way for producing TPNR blends with improved properties. In this publication the production of different types of granular rubber, the processing characteristics of various compositions of polypropylene natural rubber blends the end product performance of these blends the end product performance of these blends at different temperatures are discussed.