Abstract
Interaction between polyacrylonitrile (PAN) and hydrolytic lignin (THL) in mixed binary solution dimethyl sulfoxide/water (70:30) allowed us to obtain homogeneous forming solution of the THL/PAN composite. This forming solution was used for preparation of fibers and films which served as precursors for carbon materials. In the present work, we considered and substantiated the proposed mechanism of the formation of the THL/PAN composite based on the structure of the initial polymers. We believe that interaction between reactive groups present in PAN and THL leads to the formation of graft copolymer. Fundamentally, this reaction is possible and may proceed according to the wellknown Ritter mechanism It was demonstrated that the process of grafting nitrile groups to THL macromolecules is controlled by duration and temperature of interaction between the initial compounds in solution; this process is completed in 10 h at a temperature of 120 °C. Tentative calculation shows that for each statistically averaged PAN macromolecule there are five THL molecules with activated hydroxyl groups. These forming solutions are suitable for moulding fibers which serve as precursors for carbon fibrous materials.
Highlights
Along with cellulose, lignin is one of the main constituents of organic natural materials
Lignin is an irregular strongly branched heteropolymer of complex architecture; synthesis of this compound is controlled by unregulated natural factors
One of important aspects of practical application of THL is extracting certain organic compounds from this product. These organic materials are used in chemical industry as raw materials for synthesis of different useful compounds
Summary
Lignin is one of the main constituents of organic natural materials. One of important aspects of practical application of THL is extracting certain organic compounds from this product. These organic materials are used in chemical industry as raw materials for synthesis of different useful compounds. The process studied in the present work (formation of THL/polyacrylonitrile copolymer) can be assigned to the first type of reactions. We consider possible reactions leading to the formation of this composite and suggest the mechanism of interaction between lignin and PAN. This reaction allows using THL as a source for obtaining pore-forming composites
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