Properties of polymethyl methacrylate-based nanocomposites: Reinforced with ultra-long chitin nanofiber extracted from crab shells.

Highlights: [•] Using waste crab shells to develop high-performance composites by simple method. [•] Combining the anatomic analysis of crab shell with the design of composite. [•] Introducing a 4-step all-mechanical treatment to prepare ultra-long chitin fiber. [•] Incorporation of chitin nanofiber improves properties of PMMA/Chitin composite. [Copyright &y& Elsevier]