title: Reverse indentation size effects in gamma irradiated blood compatible blend films of chitosan-poly (vinyl alcohol) for possible medical applications.
abstract: In the present work binary blends of polyvinyl alcohol (PVA) and chitosan (CS) were prepared by solution cast method and characterized by analytical methods like FTIR, XRD and SEM for seeking structural and morphological information. The blends were exposed to gamma radiation and evaluated for their improved mechanical strength. It was found that the tensile strength and microhardness increased after irradiation of CS-PVA films. Plastic effect due to absorption of water molecules and scissoring effect due to gamma irradiation were found to decrease the softness or increase the microhardness of the blends. Improved mechanical properties were attributed to intermolecular and intramolecular hydrogen bonds and adhesive nature of the blends also. The blends were also investigated for water intake behavior and in vitro blood compatibility property on the basis of certain in vitro tests like protein adsorption, haemolysis and blood clot formation on the un-irradiated and irradiated blend samples. The increased % swelling with time could be assigned to the fact that increasing water content facilitates the phase separation process within the blend which results in advancement in interstitial nano-void spaces which are occupied by water molecules. The blood compatibility results showed that when the amount of CS was varied from 0.5% to 2%, the amount of blood clot and percent haemolysis decreased while the protein adsorption increased with increasing CS content of the blend films.
authors.affiliation: Department of Post Graduate Studies and Research in Physics, Rani Durgawati University, Jabalpur, M.P. 482002, India.
authors.forename: D S
authors.initials: DS
authors.lastname: Bisen
authors.affiliation: Department of Physics, Global Engineering College, Jabalpur, M.P. 482001, India.
authors.forename: Rinkesh
authors.initials: R
authors.lastname: Bhatt
authors.affiliation: Department of Chemistry, Bose Memorial Research Lab., Govt. Auto. Model Science College, Jabalpur 482002, M.P., India. Electronic address: akbmrl@yahoo.co.in.
authors.forename: A K
authors.initials: AK
authors.lastname: Bajpai
authors.affiliation: Department of Post Graduate Studies and Research in Physics, Rani Durgawati University, Jabalpur, M.P. 482002, India.
authors.forename: R
authors.initials: R
authors.lastname: Bajpai
authors.affiliation: Department of Physics, Government Model Science College, Jabalpur, M.P. 482001, India.
authors.forename: R
authors.initials: R
authors.lastname: Katare
mesh_terms: D000818:Animals; D002417:Cattle; D048271:Chitosan / Q000737:chemistry / Q000494:pharmacology; D004912:Erythrocytes / Q000166:cytology / Q000378:metabolism*; D005720:Gamma Rays; D006801:Humans; D008422:Materials Testing; D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol / Q000737:chemistry / Q000494:pharmacology
chemical_list: D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol; D048271:Chitosan
keywords: Blood compatibility; Chitosan; Gamma radiation; Microhardness; Polymer blends