Abstract
Deoiled rice bran, paddy husk, cashew nut shell liquid and glycerol were extruded into pellets and further pressed into composites. Processing and plasticizer type had significant effect on physico-chemical, functional, rheological and morphological properties of pellets and composites. Specific mechanical energy of the pellets containing cashew nut shell liquid as plasticizer was higher than those containing glycerol. The maximum hardness and bulk density were obtained for pellets prepared from cashew nut shell liquid. Water binding capacity and water solubility index of both pellets and composites were highest for samples containing glycerol as plasticizer. A significant change in functional properties during processing was observed among raw materials, pellets and the final product (composite sheets).
Highlights
Biodegradable polymers are substitutes to the synthetic polymers which have occupied dangerous proportions among the environmental pollutants
Water binding capacity (WBC) of raw materials provides an insight of the ability of protein structure to associate with hydrophilic substance, the bound water which can further function as plasticizer during different processing operations
The results indicate that galvanized iron can serve as a better medium for conveying pellets during processing
Summary
Biodegradable polymers are substitutes to the synthetic polymers which have occupied dangerous proportions among the environmental pollutants. Wastes from agroindustries generated during the industrial processing of agricultural products [1] have issues with their disposals. These wastes and byproducts are rich in minerals, sugars and proteins and can be used as raw materials for other industrial processes and development of value added products [2]. In order to reduce the trash collection and disposal fees, different methods and policies for byproduct and waste handling and treatment have been introduced to recover, recycle and convert the byproducts and wastes into upgraded products [3]. Biocomposites from natural fibers and biodegradable polymers have grabbed great interests in the composite science [4]
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