A series of silica/poly(methyl methacrylate) grafting composites (SiO2/PMMA) with different grafting and crosslinking structures were used to prepare poly(methyl methacrylate)/silica (PMMA/SiO2) composite fiber via solution blending and electrospinning processes.The dispersion of silica in PMMA/DMF solution and in PMMA/SiO2 composite fiber

the distribution of silica in electrospun products and the morphological characteristics of electrospun fiber were measured by dynamic light scattering (DLS)

scanning and transmission electron microscopy (SEM TEM)

as well as ultrasonic washing and HF etching experiments.It was found that only the simple-grafted silica with grafting percentage of 484.4% is suitable for preparing electrospun fiber.More than 90% of simple-grafted silica particles can be effectively encapsulated in PMMA/SiO2 electrospun composite fiber

and thus the entire cross section of PMMA/SiO2 electrospun fiber was filled by simple-grafted silica at a primary-particles size level.The above results are favorable for achieving the primary-particles-size-level-dispersion of functional inorganic particles in sub-micron level fiber

and thus can be used to guide the production of functional composite fiber.