Browsing by Author "Periasamy, K."

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Sea coral-derived cuttlebone reinforced epoxy composites: Characterization and tensile properties evaluation with mathematical models
(SAGE Publications Ltd info@sagepub.co.uk, 2016) Periasamy, K.; Mohan Kumar, G.C.
Using sea coral as a new bio-mass in processing of particle-filled polymer composites is very promising in the field of structural applications. In this study, waste cuttlebone was used as a filler material in epoxy composites. In general, cuttlebone particles derived from crushing and sieving were in aragonite polymorph form. In the present study, calcite polymorph form was obtained after heat treatment of cuttlebone particles at 400°. Presence of polymorph form, elemental composition and thermal stability were confirmed with different characterization techniques. Composites were prepared with aragonite and calcite polymorph form cuttlebone particles and commercially available calcium carbonate as reinforcement in epoxy matrix. Tensile tests were carried out to determine the composites strength and compared with predefined theoretical models. Heat-treated cuttlebone reinforced epoxy composites showed higher tensile properties and better interaction between filler and matrix than other composites. © SAGE Publications.
Structure and rheology of chitosan-nanohydroxyapatite composite hydrogel for soft tissue regeneration
(American Institute of Physics Inc. subs@aip.org, 2020) Kumar, B.Y.S.; Isloor, A.M.; Periasamy, K.; Kumar, G.C.M.
Chitosan (CS) hydrogels show desirable characteristics to use a soft tissue implants due to its biocompatibility, biodegradability and antimicrobial characteristics. However, the structural stability hinders its application in vivo. In the present work nanohydroxyapatite (HAp) was reinforced with chitosan hydrogel and to develop chitosan-hydroxyapatite (CS-HAp) composite hydrogel. The nanohydroxyapatite modifies the hydrogel network by promoting the secondary hydrogen bonds thereby enhances the mechanical stiffness. The elastic modulus could reach 10 kPa which is necessary for the proposed application. Overall, chitosan-hydroxyapatite composite hydrogels are the promising implant materials for next-generation soft tissue regeneration. Â© 2020 Author(s).
TGA/DSC studies of marine coral reinforced polymer composites
(2019) Periasamy, K.; Mohankumar, G.C.
Marine corals are mainly composed of calcium carbonate and organic matrix, which can be used as filler in polymer composites thus consequential in waste utilization from aquaculture by-products. In the present study, epoxy resin (EP) matrix composites were prepared by reinforcing raw cuttlebone particles (CB), heat treated cuttlebone particles (HB) as well as commercial calcium carbonate particles (CC) at 10 wt%. Different forms of reinforcement materials were characterized by thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to confirm the polymorph transformation. Thermal stability and glass transition temperature of EP, EP/CB, EP/HB and EP/CC composites were investigated by TGA and differential scanning calorimetry (DSC). EP/CC composite had highest glass transition temperature than EP, EP/CB and EP/HB composites, but EP/CB and EP/HB had good thermal stability than EP and EP/CC composites. � 2018 Author(s).
TGA/DSC studies of marine coral reinforced polymer composites
(American Institute of Physics Inc. subs@aip.org, 2019) Periasamy, K.; Mohan Kumar, G.C.
Marine corals are mainly composed of calcium carbonate and organic matrix, which can be used as filler in polymer composites thus consequential in waste utilization from aquaculture by-products. In the present study, epoxy resin (EP) matrix composites were prepared by reinforcing raw cuttlebone particles (CB), heat treated cuttlebone particles (HB) as well as commercial calcium carbonate particles (CC) at 10 wt%. Different forms of reinforcement materials were characterized by thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to confirm the polymorph transformation. Thermal stability and glass transition temperature of EP, EP/CB, EP/HB and EP/CC composites were investigated by TGA and differential scanning calorimetry (DSC). EP/CC composite had highest glass transition temperature than EP, EP/CB and EP/HB composites, but EP/CB and EP/HB had good thermal stability than EP and EP/CC composites. Â© 2018 Author(s).