Synthesis of chitosan-graft-polyaniline with the conductive potential
Chitosan (CS) is one of the most plenteous polymers in nature and gets ubiquitous in many fields such as pharmaceutical and medical industries, wastewater treatment, agriculture, etc.due to its remarkable biodegradability and friendliness to human beings and ecology. Recently, nature-originated conductive materials havebeen gaining more attention than other materials because they can be utilized in reality, while others are difficultto decompose after use. Understandably, polyaniline (PANI), which is one of the prominent conductive polymers with a distinguished conjugated structure, simple synthesis, cost-effectiveness, environmental stability, and conductivity, was grafted with CS (CS-graft-PANI) to produce a copolymer possessing a combination of properties between CS and PANI. Althoughthere have been several researchesrelated to this copolymer, the grafting efficiency and electrical conductivity wererelatively low. Therefore, this paper aims at obtainingahigher efficiency and electrical conductivity of CS-graft-PANI copolymerby systematically adjusting the synthesis parameters including the volume of acid solution to dissolve aniline, initiator concentration, acetic acid concentration to dissolve CS, the initiator methods and dopants. As a result, the best copolymer product reached a graft efficiency of 69.4% and grafting percentage of 78.5% with an electrical conductivity of 7.9610-3 Scm-1. The chemical composition and morphology were determinedby Fourier-transform Infrared Spectroscopy and Scanning Electron Microscope while the thermal characteristic was also carefully detected via Thermogravimetric Analysis.
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