Effects of glycerol and ethylene–acrylic acid on composition optimization of PVOH/starch‐blended biodegradable resin using response surface methodology

Abstract

Response surface methodology was used to analyze the effect of glycerol (X 1 ) and ethylene-acrylic acid (EAA) level (X 2 ) on the objective (water solubility index (WSI), water absorption index (WAI), and tensile strength) attributes of a poly(vinyl alcohol) (PVOH)/ starch-blended plastic resin. A rotable central composite design was used to develop models for the objective responses. The experiments were run with different barrel temperatures, such as zone 1: 100 C, zone 2: 100 C, zone 3: 105 C, and zone 4: 105 C, respectively, with a feed rate of 20 g/min and screw speed of 25 rpm. Responses were most affected by changes in glycerol level (X 1 ) and to a lesser extent by EAA level (X 2 ). Individual contour plots of the different responses were overlaid, and regions meeting the optimum WSI of 6.10%, WAI of 5.57 g gel/g dry wt, and tensile strength of 62.14 MPa were identified at the glycerol level of 72.41 mL and the EAA level of 36.03 g, respectively.

Effect of addition of nanoclay, beeswax, tween-80 and glycerol on physicochemical properties of guar gum films

“…RSM has been reported to be an effective tool for optimizing a process when the independent variables have a combined effect on the desired response (Hunter, 1959). The basic principle of RSM is to form regression equations that relates product properties to input parameters and also describes interrelations between various input variables (Li et al, 2009). In order to better understand the individual and interactive effects of variables on biopolymer based film parameters, RSM was earlier used by several authors (Maran et al, 2013b;Denavi et al, 2009;Espitia et al, 2013).…”