Synthesis and characterization of new calixarene-chitosan polymers

2017-08-11T14:22:19Z (GMT) by Yuning Liu Zhimei Zhong
<p>Triflate Ester of Calix[<i>n</i>]arene (<i>n</i> = 4, 6, 8) (TEC[<i>n</i>] (<i>n</i> = 4, 6, 8)) were synthesized based on a new synthetic route, then TEC[<i>n</i>] (<i>n</i> = 4, 6, 8) were further modified by reacting with low molecular weight Chitosan (CS) to get three kinds of new Calix[<i>n</i>]arene-Chitosan polymers (<i>n</i> = 4, 6, 8) (C[<i>n</i>]CSP (<i>n</i> = 4, 6, 8)) through Buchwald-Hartwig cross coupling reaction. The structures of the polymers were characterized by FT-IR, SEM, Elemental analyzer and <sup>13</sup>C SSNMR. And the results found that Chitosan was successfully introduced to Calix[<i>n</i>]arene (<i>n</i> = 4, 6, 8) (C[<i>n</i>] (<i>n</i> = 4, 6, 8)) without any long-chain alkyl between Chitosan and Calixarene. These new polymers are partially substituted calixarene. The substitute degree of C[4]CSP, C[6]CSP and C[8]CSP is 17.75%, 21.08% and 54.53% respectively. And the optimal preparation conditions were discussed and the results were listed as following, molar ratio (1:2), catalyst (0.05 mmol), solvent ratio (1:1.5 (10 mL•1.0 mmol<sup>−1</sup>)) and reaction time (5h).</p>