Abstract
In this work polylactic acid (PLA)/starch biocomposite samples with optimized mechanical properties and suitable cost have been prepared by extrusion and thermal mixing. The variables to be optimized were PLA, corn starch, ethyl vinyl acetate (EVA), carboxy methyl cellulous (CMC) and glycerol mono- stearate (GMS) contents. The experiments were carried out based on the experimental design using D-optimal mixture methods. The analysis of variance indicated accuracy of the model. It was observed that biocomposite sample with PLA 59.5%, Starch 20%, EVA 10%, CMC 6.5%, GMS 2% and CaCO3 2% would be attained noticeable improvement in the mechanical properties. Fourier transform infrared spectroscopy (FTIR) in combination with partial least square (PLS) chemometric technique was used to estimate the mechanical properties in five different spectral regions. Results show good accuracy between calibration and validation sets also denoted that O-C = O stretching and C = O stretching functional groups of PLA, EVA, CMC and GMS have the most positive effect on tensile strength and hydrogen bonded hydroxyl group of starch has the minimum positive effect. This research provided a method to improve the mechanical properties of biocomposite samples by using the D-optimal design and PLS chemometric techniques and Obtained results demonstrated that PLS could accurately predict mechanical properties in these spectral regions.
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