有机-无机杂化非离子型水性聚氨酯/SiO_2复合材料的合成及性能

In Situ Polymerization and Characterization of Nonionic Waterborne Polyurethane/Fumed SiO_2 Hybrid Composites

以表面接有十六烷基的新型疏水气相SiO2(R816)为改性剂,采用原位聚合法合成非离子型水性聚氨酯/SiO2杂化材料(NPU/R)。以红外分析表征了产物的结构,通过扫描电镜、原子力显微镜和动态力学分析考察了疏水气相SiO2的分散性、NPU/R膜表面形态和微相结构,研究了疏水气相SiO2含量对膜防水性、紫外光透过率、热稳定性等性能的影响。结果表明,疏水气相SiO2的引入增大了聚氨酯材料的微相分离;随着SiO2质量分数的增加,杂化膜表面粗糙度增加,紫外光透过率降低,热稳定性增强;当SiO2质量分数为1%时,其在聚氨酯中分散均匀,成膜水接触角为94.1°,溶胀率降为26.2%。

Nonionic waterborne polyurethane/fumed SiO2 hybrid （R816） composites （NPU/R） were prepared by in situ polymerization using novel hydrophobic fumed silica＇ with long chain alkyl （R816） as modifier. The structures of NPU/R were characterized by FT-IR. The dispersion properties of SiO2, surface morphology, and micro-phase structure of NPU/R were studied by SEM, AFM, and DMA. The influences of hydrophobic fumed SiO2 content on the water resistance, transmission of UV light, and thermal stability of NPU/R were also investigated. Results show that the incorporation of hydrophobic fumed SiO2 increases the micro-phased separation degree and decreases the transmission of UV light of hybrid films. With increasing the mass fraction of hydrophobic fumed SiO2, the surface roughness and thermal stability of NPU/R hybrids are enhanced. When the mass fraction of SiO2 is 1%, the hybrid film has superior properties, the contact angle of 94.1° and swelling ratio of 26.2 %.