Parametric optimization and kinetic elucidation of degradation of starch blended LDPE films through central composite design approach towards application in packaging

Abstract

The present investigation emphasizes on the parametric optimization of degradation of starch blended LDPE films towards the development of an optimum composition for its utilization as a biodegradable packaging film. The individual effect of the essential parameters influencing the degradability determined by loss in weight and loss in tensile and tear strength were reported. Optimization of the process parameters was done using Central Composite Design approach of Response Surface Methodology. ANOVA (Analysis of variance) study suggested that the obtained equation for the degradation of the films is quadratic in nature and is significant for the process. The produced films were extensively characterized by SEM, XRD and EDAX analysis. The addition of starch by 60% in the matrix reduces the tensile strength from 13.25MPa to 3.82MPa and MFI and tear strength to a value of 0.3g/10min and 59.62N/mm respectively, however the Young’s modulus and stiffness increased to 469.37MPa and 33851.78N/m respectively. The degradation rate constant (k) calculated in both garden soil and vegetable waste increased as starch content increased. Thus the obtained kinetics and optimized conditions suggests the optimum content of the biofiller needed for superior mechanical properties with enhanced biodegradation.