Biocomposites of cellulose reinforced starch: improvement of properties by photo-induced crosslinking.
In the present study, the composite films have been prepared from the aqueous dispersions of starch with microcrystalline cellulose using glycerol as plasticizer and irradiated under ultraviolet (UV) light using sodium benzoate as photo-sensitizer. Photo-crosslinking was characterized by measuring the water absorption under 100% relative humidity, swelling degree and gel fraction in dimethylsulphoxide (DMSO), upon irradiation time. Both, the incorporation of cellulose and photo-irradiation were found to decrease the water absorption, swelling in DMSO and increase the gel fraction. Thermal transitions indicated the anti-plasticization of amylopectin chains at the fiber/matrix interface. With increasing content of cellulose and photo-irradiation time, the tensile modulus and strength were found to improve. It is summarized that the combination of cellulose reinforcement and photo-crosslinking of matrix has improved the physical and mechanical properties.
Kumar
Annamalai Pratheep
AP
Division of Polymer Science and Engineering, National Chemical Laboratory, Pune 411 008, India.
Singh
Raj Pal
RP
D000327:Adsorption / Q000187:drug effects / Q000528:radiation effects; D001672:Biocompatible Materials / Q000737:chemistry*; D001696:Biomechanical Phenomena; D002151:Calorimetry; D002482:Cellulose / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000494:pharmacology*; D008027:Light; D010968:Plasticizers / Q000378:metabolism; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000378:metabolism
D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D010968:Plasticizers; D014867:Water; D002482:Cellulose; D013213:Starch; C109691:microcrystalline cellulose