Pluronic F127 diacrylate (F127DA) micelle-crosslinked methacrylated hyaluronic acid (MeHA) hydrogel with low-swelling and strong compressive properties was successfully synthesized for the regeneration of cartilages in vivo.

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The morphological collapse of pure biomassbased carbon fibers is the main challenge restricting its development. Inspiration comes from nature that cellulose and lignin in natural trees are linked by covalent-bonds, leading to good extensibility and stability of wood. In this work, an effective strategy is presented to connect lignin and celluloseacetate by covalent-bond to obtain a novel carbon fiber precursor material. Isophorone diisocyanate was used as a chemical modifier to successfully connect lignin and celluloseacetate through a covalent-bond, which is formed by the urethane reaction of isocyanate group and hydroxyl group. With the introduction of covalent-bond connection, the precursor fibers exhibit a large molecular weight, uniform molecular weight distribution, excellent thermal stability, and good spinnability. After thermo-stabilization and carbonization, the pure biomass-based carbon fibers are successfully prepared. The results of SEM, BET, tensile test, and electrochemical properties test indicate that the covalent-bond connection effectively maintains morphology of fiber, which plays a key role for increasing the strength and the energy storage capacity of carbon fibers. The pure-biomass-based carbon fibers show promise for the production of high-quality, green, and cost reduced carbon fibers.