功能化SiO_2/PU纳米复合材料的合成与表征

Synthesis and characterization of functionalized SiO_2/PU nanocomposite

为了取得具有优良分散性的纳米二氧化硅,增强纳米二氧化硅和PU基材的聚合。纳米二氧化硅首先与一种新的高分子表面活性剂聚合成的聚(丙二醇)酯(PPG)和多聚磷酸(PPA)来改性,接着通过原位聚合制备聚氨酯(PU)/二氧化硅纳米材料。通过红外光谱、扫描电镜(SEM)、X-射线衍射和TGA,研究纳米二氧化硅的表面改性,微观结构以及纳米复合材料的性能。研究发现,通过PU/二氧化硅纳米复合材料与PPG-P改进后的纳米二氧化硅具有良好的分散性。聚氨酯的分段结构在纳米复合材料中没有受到纳米二氧化硅的影响。

In order to obtain nm silica with excellent dispersion, enhancing the polymerization of nm silica and PU substrate, the nm silica should be modifi ed with a new poly（propylene glycol） ester（PPG） synthesized by polymer surfactant and poly phosphoric acid（PPA）, and Si O2/PU nm materials are prepared by in situ polymerization. By infrared spectroscopy, scanning electron microscopy（SEM）, X-ray diffraction and TGA, the surface modifi cation, microstructure and properties of nm silica are studied. The study fi nds that PU/silica nanocomposites and PPG-P modifi ed nm silica has good dispersion. The segmented structure of polyurethane is not affected by nm silica in the nm composite materials.