Abstract
Dibutyrylchitin was prepared by an acylating reaction in a heterogeneous system with butyric anhydride as an acylating agent and perchloric acid as a catalyst. The effects of the preparation conditions, including chitin grain size, reaction temperature, and reaction time, on conversion ratio of chitin to dibutyrylchitin are discussed in detail. By adjusting reaction time and reaction temperature, dibutyrylchitin with an adequate intrinsic viscosity could be obtained. Steady-state rheological measurement was also performed and the results revealed that concentration, temperature, and shear rate had a great influence on the rheological properties of dibutyrylchitin/dimethylformamide solutions. Thus, a suitable spinning condition could be determined from the rheological analyses.
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