静电纺PMMA/SiO2复合纤维结构形态的优化

 将接枝交联结构不同的二氧化硅/聚甲基丙烯酸甲酯（SiO2/PMMA）复合材料与PMMA树脂混合后，溶于N,N-二甲基甲酰胺（DMF）溶剂中制成高分子溶液，再通过静电纺丝技术制备相应的复合纤维。通过3D-POM、SEM、TEM等显微技术考察电纺工艺和配方对复合纤维结构形态的影响。研究表明，SiO2接枝率为484.4%的简单接枝SiO2/PMMA/DMF高分子溶液具有较好的可纺性，在优化条件下所制的亚微米级PMMA/SiO2复合纤维形貌规整、表面平滑、直径和SiO2含量在较大范围内可调，SiO2在纤维内分散均匀稳定、且这种高分散性不受纤维直径和SiO2含量的影响。

Structure and morphology optimization of PMMA/silica electrospun composite fiber

Silica/poly(methyl methacrylate) grafting composites (SiO2/PMMA) with different grafting/crosslinking structures and PMMA resin were used to prepare poly(methyl methacrylate)/silica (PMMA/SiO2) composite fiber via solution blending and electrospinning processes. The effects of grafting and crosslinking structure, solution solid content, silica content, spinning voltage, spinning distance, humidity and temperature on the structure and morphology of composite fiber were studied via 3D-POM, SEM, TEM. It was found that the simple-grafted silica with grafting percent of 484.4% is suitable for preparing electrospun fiber. A series of submicron PMMA/SiO2 composite fibers with regular morphology, smooth surface, adjustable fiber diameter and silica content in a wide range can be easily prepared under optimum conditions. Almost all of silica particles can be dispersed in fiber inner at a primary-particles size level, and this high dispersibility can be maintenance in a wide range of fiber diameter and silica content.