Organic Fabric‐Reinforced Thermoplastic PMMA ‐Based Composites: Preparation, Performance, and Recovery Behavior

A polymethyl methacrylate/methyl methacrylate (PMMA/MMA) binary liquid resin (PMBLR) was employed to fabricate polyimide‐, aramid‐, and ultrahigh‐molecular‐weight polyethylene (UHMWPE)‐fabric‐reinforced PMMA composites via vacuum‐assisted resin infusion (VARI). The low porosity of polyimide/PMMA (0.171%), aramid/PMMA (0.251%), and UHMWPE/PMMA (0.058%) demonstrated effective impregnation of the three fabrics by the PMMA/MMA resin. Mechanical testing showed that the tensile strengths of polyimide/PMMA, aramid/PMMA, and UHMWPE/PMMA decreased from 728 to 623 MPa, from 667 to 554 MPa, and from 485 to 409 MPa, respectively, as the temperature increased from −30°C to +50°C, corresponding to reductions of 14%, 17%, and 16%. The three composites showed comparable short‐beam strengths (14.37–14.76 MPa), but Polyimide/PMMA exhibited a stiffness‐dominated, high‐load‐bearing response, with the highest flexural strength (206 MPa) and impact strength (233 kJ/m 2 ). Its flexural and impact strengths were 17% and 28% higher than those of Aramid/PMMA, and 137% and 36% higher than those of UHMWPE/PMMA, respectively. Aramid/PMMA exhibited intermediate mechanical performance, whereas UHMWPE/PMMA showed a more compliant response with lower flexural and impact strengths. MMA‐assisted dissolution removed the PMMA matrix while preserving the macroscopic integrity of the organic fabrics, supporting the feasibility of fabric recovery from these PMMA‐based composites.