Swelling mechanism of urea cross-linked starch-lignin films in water.

Abstract:

:Coating fertilizer particles with thin films is a possibility to control fertilizer release rates. It is observed that novel urea cross-linked starch-lignin composite thin films, prepared by solution casting, swell on coming into contact with water due to the increase in volume by water uptake by diffusion. The effect of lignin content, varied from 0% to 20% in steps of 5% at three different temperatures (25°C, 35°C and 45°C), on swelling of the film was investigated. By gravimetric analysis, the equilibrium water uptake and diffusion coefficient decrease with lignin content, indicating that the addition of lignin increases the hydrophobicity of the films. When temperature increases, the diffusion coefficient and the amount of water absorbed tend to increase. Assuming that swelling of the thin film is by water uptake by diffusion, the diffusion coefficient is estimated. The estimated diffusion coefficient decreases from 4.3 to 2.1 × 10-7 cm2/s at 25°C, from 5.3 to 2.9 × 10-7 cm2/s at 35°C and from 6.2 to 3.8 × 10-7 cm2/s at 45°C depending on the lignin content. Activation energy for the increase in diffusion coefficient with temperature is observed to be 16.55 kJ/mol. An empirical model of water uptake as a function of percentage of lignin and temperature was also developed based on Fick's law.

journal_name

Environ Technol

journal_title

Environmental technology

authors

Sarwono A,Man Z,Bustam MA,Subbarao D,Idris A,Muhammad N,Khan AS,Ullah Z

doi

10.1080/09593330.2017.1332108

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

1522-1532

issue

12

eissn

0959-3330

issn

1479-487X

journal_volume

39

pub_type

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