Journal
MARINE DRUGS
Volume 12, Issue 11, Pages 5547-5562Publisher
MDPI
DOI: 10.3390/md12115547
Keywords
chitosan (CS); glycidyltrimethylammonium chitosan (GTMAC-CS); maxwell model; relaxation time; frequency-concentration master curve; sol-gel transition
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Funding
- National Science Council of the Republic of China, Taiwan [NSC_103-2218-E-027-015]
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In this study, chitosan (CS) grafted by glycidyltrimethylammonium chloride (GTMAC) to form GTMAC-CS was synthesized, chemically identified, and rheologically characterized. The Maxwell Model can be applied to closely simulate the dynamic rheological performance of the chitosan and the GTMAC-CS solutions, revealing a single relaxation time pertains to both systems. The crossover point of G' and G '' shifted toward lower frequencies as the CS concentration increased but remained almost constant frequencies as the GTMAC-CS concentration increased, indicating the solubility of GTMAC-CS in water is good enough to diminish influence from the interaction among polymer chains so as to ensure the relaxation time is independent of the concentration. A frequency-concentration superposition master curve of the CS and GTMAC-CS solutions was subsequently proposed and well fitted with the experimental results. Finally, the sol-gel transition of CS is 8.5 weight % (wt %), while that of GTMAC-CS is 20 wt %, reconfirming the excellent water solubility of the latter.
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