Effect of Amylose/Amylopectin ratio on physico-mechanical properties of rubber compounds filled by starch

Much research is currently focused on the use of starch as an industrial raw material, which can reducedependence on non-renewable resources. pure starches of plants includes 20 -30% of amylose, this value might becometo 80% in some starches scarcely, 70-90% amylopectin, approximately 1% fat, protein and minerals. starches fromvarious sources contain different amounts of amylose and amylopectin, which influence physicochemicalproperties such as gelatinization, water absorption and paste viscosity. therefore, amylose/amylopectin (am/ap) ratioin starch would effect on physico-mechanical properties of the material which produced from it. the determination ofam/ap ratio in several samples of starch by a simple modified method was described in this paper and the samples withdifferent am/ap ratio were applied as filler in rubber compounds. the physico-mechanical properties of obtaindcure rubbers were investigated. the results showed that the physico-mechanical properties of natural rubber (nr)compounds filled by various starches are mainly correlated with am/ap ratio in the starch samples.