Faced with the serious pollution caused by plastics wasters and depletion of petroleum & coal resources, it makes a growing urgency to utilize the renewable resources for producing the environmentally friendly materials. Herein, we have established a new strategy, namely by combining the aligned nanofibers and the dual-crosslinking the simultaneous strengthening and ultrahigh toughness in the regenerated cellulose materials can be realized. A series of ultrahigh tough and highly strength cellulose materials including fibers, films and hydrogels were constructed from the cellulose solution in alkali/urea aqueous system with cooling, in which the extended stiff chains of cellulose aggregated easily in parallel manner under mild coagulating environment to form dense nanofibers with mean diameter of about 30 nm, displaying an orientation microstructure and excellent mechanical properties. On the basis of the pre-stretching ability of the chemically cross-linking networks and the removability of the cellulose nanofibers and molecular bundles in the hydrogel state, a highly ordered structure in the chemically and physically crosslinked double networks containing nanofibers was created through strong self-aggregation force of the cellulose driven by hydrogen bonds. After thorough washing, the strong interactions in the cellulose hydrogel generated enough forces to tightly fix (freeze") the oriented nanofibrous structure and designed shape, leading to the formation of the ultrahigh tough materials. For example, the tensile strength and specific strength of the cellulose films achieved to 253 MPa and 217±15 MPa g-1 cm3, to close the lightweight titanium alloy (244 MPa g-1 cm3).

Ultrahigh tough regenerated cellulose materials constructed from cellulose solution via double cross-linking

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.