Development Of New Green Chitosan-Natural Rubber And Chitosan-Banana Trunk Fibres Biocomposites As Release Matrices
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Date
2017-01
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Universiti Sains Malaysia
Abstract
A new class of green biocomposites comprising of (i) acidified chitosan (CTSAC) dispersed in partially cross-linked NR matrices ( AC-d-NR) = 2.5, 5, 10, 20 and 40-phr, and (ii) banana trunk fibres (BTF) immobilized in CTSAC (BTF-i-CTSAC) were prepared and characterized by means of Fourier Transform Infrared (FT-IR) spectroscopy, Thermogravimetric Analysis (TGA), Scanning Electron Microscope (SEM) and Brunauer–Emmett–Teller (BET). Results of FT-IR and TGA analyses revealed that, in AC-d-NR, the CTSAC was not grafted but dispersed in partially crosslinked NR, and in BTF-i-CTSAC, the BTF were merely immobilized in CTSAC AC- - = 2.5, 5, 10, 20 and 40-phr) were used as slow release matrices for several pesticides and fertilizers, and BTF-i-CTSAC (BTF = 10 %) as sorbent for the removal of Cd2+ and Cr6+ from aqueous media. The swelling behaviours of partially cross-linked NR, CTSAC film, BTF, AC-d-NR and BTF-i-CTSAC in water and several organic solvents were CTSAC-d-NR, it is found that due to hydrophilic nature of CTSAC, increased in CTSAC loading resulted in the increased water uptake but decreased in organic solvents uptake. These properties can be attributed to the internal voids formed by the shrinkage of CTS during drying process. Results of soil burial biodegradability studies for a period of eight months indicated percentage weight loss of 7.85, 19.98, 27.68, 51.67, 62.65 and 73.55% for partially cross-linked NR, 2.5phrCTSAC-d-NR, 5phrCTSAC-d-NR,
10phrCTSAC-d-NR, 20phrCTSAC-d-NR and 40phrCTSAC-d-NR, respectively.
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Keywords
Development of new green chitosan-natural rubber , hitosan-banana trunk fibres biocomposites