الفهرس | Only 14 pages are availabe for public view |
Abstract Proteic waste materials from pharmaceutical manufacturing, tanning and agro-industries have attracted increasing attention because their intrinsic agronomic values bond to the high nitrogen content. Proteins of animals or vegetable origin can be itself transformed into biomaterials, or blended with synthetic and natural polymers. This latter approach represents the aims of this work. Many types of films have been prepared by using waste pharmaceutical gelatin with natural or synthetic additives such as sugar cane bagasse, sawdust and poly (vinyl alcohol). Blends and composites, based on waste gelatin, synthetic water-soluble polymer as well as lignocellulosic agro industrial by-products such as sugar cane bagasse and sawdust, containing active agents and herbicides, have been prepared by simple casting procedure of water solutions and/or dispersions to produce thin coherent films for agricultural applications as mulching films and in controlled release. Elemental analysis, scanning electron microscope, and mechanical properties have been used to characterize these films. The results showed that mechanical properties as well as degradation rate and extent of the investigated blends and composites could be modulated by suitably tuning their chemical composition. In addition, the different components of the blends might exert a beneficial role on soil structure and fertility. |