Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE This study optimized and screened the PMMA/MMA binary resin system by adjusting its viscosity and the redox initiation system. This method enables low-temperature polymerization and ensures stable mechanical properties. CF/PMMA composites were fabricated using the VARTM process, demonstrating their suitability as a resin matrix for high-performance fiber-reinforced composites.

ABSTRACT
This study employed a binary liquid resin system composed of poly(methyl methacrylate) (PMMA) and methyl methacrylate (MMA). By adjusting the molecular weight of the pre-dissolved PMMA and its ratio to MMA, resins (PMMA liquid resin) with different viscosities were prepared. Four redox initiation systems BPO/DMA (benzoyl peroxide/N,N′-dimethyl-p-toluidine), BPO/DMT, LPO/DMA, and LPO/DMT (lauroyl peroxide/N,N′-dimethylaniline) were selected to systematically investigate their effects on the polymerization exotherm, curing time, and the mechanical properties of the post-cured material. Through mechanical property testing, analysis of molecular weight and its distribution, and thermal performance analysis, the optimal system parameters were determined. The results indicate that the PM-10 resin (100 mPa s), with an initiation system of nMMA:nBPO:nDMA = 200:1.2:1, achieves optimal mechanical properties in the resulting pure resin. Furthermore, the CF/PMMA composites prepared using this system exhibit excellent macroscopic mechanical properties, with a tensile strength of 980.43 MPa and a tensile modulus of 74.15 GPa. This study confirms that through synergistic control of viscosity and the initiation system, the PMMA liquid resin system can achieve a combination of low-temperature controllable polymerization and favorable mechanical performance, offering a viable option as a resin matrix for fiber-reinforced composites.