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首先合成内交联的WPU预聚体,以KH550为偶联剂,加入亲水性的纳米SiO2(A200),通过溶胶-凝胶过程合成了一种水性聚氨酯/纳米SiO2杂化材料(WPUNS)。通过FTIR、TG、DSC、物理机械性能测试对WPUNS的结构和膜性能进行了研究,用动态激光光散射法测试了杂化乳液的粒径和粒径分布,并用TEM对乳液形貌进行了观察。红外分析表明,WPU大分子和A200之间形成了化学键,粒径和乳液形貌观察显示了PU大分子包裹A200粒子形成了复合粒子结构。当w(A200)由0增大到2%时,粒径由79.9 nm增至139.9 nm,膜的拉伸强度由6.32 MPa增加到20.46 MPa,吸水率由28.3%降低到6.3%,硬度亦相应提高。TG分析表明,A200的加入可以提高材料的耐热性。DSC表明,A200的加入使硬段Tg向高温扩展。
Firstly, an internally cross-linked WPU prepolymer was synthesized. KH550 was used as the coupling agent, and hydrophilic nano-SiO2 (A200) was added to prepare an aqueous polyurethane / nano-SiO2 hybrid material (WPUNS) by sol- . The structure and membrane properties of WPUNS were studied by means of FTIR, TG, DSC and physical and mechanical properties tests. The particle size and particle size distribution of the hybrid emulsion were measured by dynamic laser light scattering. The morphology of the emulsion was observed by TEM . Infrared analysis showed that a chemical bond was formed between WPU macromolecule and A200. The observation of particle size and emulsion morphology showed that PU macromolecule wrapped A200 particles to form composite particle structure. When w (A200) increased from 0 to 2%, the particle size increased from 79.9 nm to 139.9 nm, the tensile strength of the film increased from 6.32 MPa to 20.46 MPa, and the water absorption decreased from 28.3% to 6.3% improve. TG analysis shows that the addition of A200 can improve the heat resistance of the material. DSC showed that the addition of A200 extended the hard segment Tg to high temperature.