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Changanassery, India

Prasad Rajan K.,Yanbu Industrial College | Dhilipraj D.B.,Manali Petrochemical Ltd | Manikandan R.,Stberchmans College | Veena N.R.,Stberchmans College
Cellular Polymers | Year: 2011

There is a growing interest in developing and commercializing viscoelastic polyurethane foam suitable for pillow and mattress applications. In the present investigation, a novel combination of polyols with different molecular weights and hydroxyl values along with other ingredients were used for the preparation of viscoelastic polyurethane foam. The optimum polyol:isocyanate ratio was found to be 100:45 to yield a good quality foam. The physico-mechanical properties of the foam were measured as per standard procedures and compared with those of a commercially available viscoelastic foam sample. It was observed that the properties of the foam from this investigation were almost similar and in some aspects better than the properties of commercially available pillow foam. The foam can be further developed to make it suitable for hospital pillows and mattress applications. © Smithers Rapra Technology, 2011. Source

Rajan K.P.,P.A. College | Veena N.R.,Stberchmans College | Maria H.J.,Stberchmans College | Rajan R.,Stberchmans College | And 2 more authors.
Journal of Composite Materials | Year: 2011

This investigation deals with the detailed procedure for the extraction of microfibrils from raw bamboo. The microfibrils obtained from raw bamboo were characterized using scanning electron microscope and the average diameter of the fibrils was found to be 10 μm. These microfibrils were then incorporated into polyhydroxybutyrate (PHB) matrix using conventional plastic processing equipments. The impact strength values of the resulting composites indicate that there is an optimum loading of microfibrils in the PHB matrix, beyond which the effect of fibril loading is not significant. © The Author(s) 2010. Source

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