采用水溶性太分子单体（PEGMA）改性纳米二氧化硅水溶胶（R301-PEGMA），并通过反相乳液法制备光固化水性聚氨酯纳米复合乳液。R301、PEGMA的引入使得复合乳液的粒径和黏度明显增大，透射电镜（TEM）、扫描电镜（SEM）和原子力显微镜（AFM）对复合膜微观结构的分析表明，改性纳米二氧化硅均匀分散在聚氨酯基体和涂层表面，动态力学分析表明，改性纳米二氧化硅可显著提高复合膜储存模量，并且tanδ峰出现明显宽化现象，说明R301—PEGMA与聚氨酯之间存在很强的相互作用。
A water soluble the aqueous colloidal silica ( poly(ethylene glycol) monomethyl ether methacrylate (PEGMA) was used to modify R301-PEGMA). The waterborne UV-curable polyurethane (WUPU)/12301-PEGMA nanocomposite was prepared by the phase-inversion emulsification method. These composites exhibit the larger particle size and higher viscosity than those of the WUPU dispersion. TEM and SEM measurements show that R301- PEGMA nanoparticles are well dispersed and integrated in the WUPU matrix. AFM measurements further demonstrate that R301-PEGMA nanoparticles are also well dispersed and embedded at the WUPU film.surface. I)MA analysis demonstrates that the WUPU/R301-PEGMA nanocomposite films shows a broadening of the glass transition and has no obvious glass transition for the nanocomposites with 10 % R301-PEGMA, providing the evidence of the strong covalent bonding interactions between the WUPU chain and R301-PEGMA. The PEGMA functionalized nanocomposite fihns displayed enhanced storage modulus, tensile strength without sacrificing high elongation at break compared to those of the WUPU/R-301 nanocomposite films.
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