title: Synthesis and rheological characterization of water-soluble glycidyltrimethylammonium-chitosan.
abstract: 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.
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10648, Taiwan. f10714@ntut.edu.tw.
authors.forename: Syang-Peng
authors.initials: SP
authors.lastname: Rwei
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10648, Taiwan. t7350304@gmail.com.
authors.forename: Yu-Ming
authors.initials: YM
authors.lastname: Chen
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10648, Taiwan. q121926@gmail.com.
authors.forename: Wen-Yan
authors.initials: WY
authors.lastname: Lin
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10648, Taiwan. wheyichiang@gmail.com.
authors.forename: Whe-Yi
authors.initials: WY
authors.lastname: Chiang
mesh_terms: D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D004852:Epoxy Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D005782:Gels; D008956:Models, Chemical; D044367:Phase Transition; D000644:Quaternary Ammonium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012212:Rheology; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D004852:Epoxy Compounds; D005782:Gels; D000644:Quaternary Ammonium Compounds; D014867:Water; C045006:glycidyl trimethylammonium; D048271:Chitosan