【摘要】 在聚氨酯溶液湿法成膜的过程中引发前驱体的原位水解缩聚反应,成功地将纳米级TiO₂颗粒均匀地引入聚氨酯合成革涂层中。低温氮吸附/脱附试验证明,在有机聚氨酯和无机纳米TiO₂颗粒间形成了相间孔隙,这使得本试验所制备的聚氨酯/纳米TiO₂原位杂化涂层具有明显提高的透气、透湿性。更多还原

【Abstract】 As polyurethane solution coagulated in wet phase inversion process,in-situ hydrolysis and condensation reactions of nano precursor were triggered synchronously to introduce nano-TiO₂ into polyurethane synthetic leather coating.Water vapor and gas permeability of the hybrid coatings are found to increase with an increasing concentration of nano-TiO₂,which is explained as voids formed at organic polymer-inorganic nano particle interface.The existence of such voids was proved in nitrogen adsorption/desorption experiment,by the determination of extra mesopores and higher specific surface area than predicted values.更多还原