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Modification of mechanical and thermal properties of chitosan-PVA blend films using radiation technique

Nazia Rahman, Nirmal Chandra Dafader, S. Sahnaz, Md. Nabuk Sardar, Abdur Rahim Miah, Md. Homayon Kabir


In this study casting method is used to prepare different composition of chitosan-PVA blend films (thickness 0.16 mm). Optimum composition (chitosan: PVA = 1: 4) of the blend film was selected based on mechanical properties. The tensile strength (TS) and elongation at break (Eb) of the film at this composition was 24 MPa and 20 % respectively. The chitosan-PVA films were modified with monomer, methyl methacrylate (MMA) using gamma radiation. Monomer concentration was varied from 1-7 %, soaking time was varied from 10-30 min and radiation dose was varied from 10 kGy-40 kGy. Mechanical properties of the modified films were investigated. The best performance was observed for the chitosan-PVA films soaked in 3% monomer solution for 20 min soaking time and irradiated by 30 kGy radiation dose. The TS and Eb found under this condition were 36 MPa and 34 % respectively. Water uptake of the films was studied. Thermal properties of films were characterized by thermo gravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The molecular interaction and morphological features of the films were investigated using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM).


chitosan; poly(vinyl alcohol); blend film; radiation modification

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