Abstract
The classical method of producing cellulose oligomers through hydrolysis of microcrystalline cellulose (MCC) in phosphoric acid has been re-examined. Hydrolysis products are fractionated by precipitation to yield two types of cellulose oligomers with different average degrees of polymerization (DP). The number- and weight-averaged molecular weights of the lower DP fraction are 1339 g/mol and 1388 g/mol respectively, corresponding to a polydispersity index of 1.04. The cellulose oligomer forms type-II crystal, and can be dissolved in both alkaline aqueous solutions and dimethyl sulfoxide. The X-ray and neutron small angle scattering of the cellulose oligomers in solution can be described as rigid slabs.
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