Water Uptake Behavior of Lignin Modified Starch Film

Abstract:

A biodegradable urea crosslinked starch film was prepared. To improve the water resistance, the urea crosslinked starch system was reinforced with 5%, 10%, and 15% lignin. The prepared films were immersed in distilled water at three different temperatures, 25°C, 35°C and 45°C to study the behavior of water uptake. The addition of lignin effectively decreases water uptake as proven by lower water uptake equilibrium. Diffusion coefficient was calculated from the kinetic water uptake profile using the slope method of Fick’s second law for thin slab model. The calculated diffusion coefficient decreases as the lignin is increased. The diffusion coefficient is found to be dependent on the temperature. As more lignin is added to the system, higher activation energy is obtained due to the hydrophobicity of lignin.

• Periodical: Applied Mechanics and Materials (Volume 699)
• Pages: 204-209
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.699.204
• Online since: November 2014
• Authors: Ariyanti Sarwono*, Zakaria Man, Mohd Azmi Bustam, Khairun Azizi Azizli
• Keywords: Diffusion Coefficient, Lignin, Tapioca Starch, Water Uptake

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