Yu Qing, Pan Peiting, Du Zongliang, Du Xiaosheng, Wang Haibo, Cheng Xu
Textile Institute, College of Light Industry, Textile and Food Engineering, Sichuan University Chengdu 610065 China
RSC Adv. 2019 Mar 8;9(14):7795-7802. doi: 10.1039/c8ra09961h. eCollection 2019 Mar 6.
Two kinds of dimethylpolysiloxane, KF-6001 and X-22-176-DX, were used to modify polyurethane. The effects of KF-6001 and X-22-176-DX on the colloidal, physico-chemical and surface properties were studied for polydimethylsiloxane modified cationic waterborne polyurethanes (SiCWPUs). The chemical structures and the surface morphologies of the SiCWPUs are characterized Fourier transform infrared spectrometry and scanning electron microscopy. The results showed that the addition of siloxane changes the structure and surface morphology of the polyurethane. The element distributions in the polymer films were tested X-ray photoelectron spectroscopy, and the effect of the hydrophobicity of the surfaces of the polymer films of the cationic waterborne polyurethanes was demonstrated water contact angle tests on the surfaces of the films. As the amount of siloxane added increases, the silicon content on the surfaces of the SiCPWU1 films increases from 0% to 17.92%, and the actual silicon content on the surfaces of the films was much larger than the theoretical value. Therefore, the hydrophobicity of the membrane surface increases sharply, and the contact angle increases from 63.0° to 105.3°. Dynamic mechanical analysis indicates that the introduction of polydimethylsiloxane into the cationic aqueous polyurethane chain increases microphase separation in the polymer films. Stress-strain data showed that the mechanical properties of SiCPWU1 films were better than those of SiCPWU2 films when the same amounts of PDMS were added.
使用两种二甲基聚硅氧烷KF - 6001和X - 22 - 176 - DX对聚氨酯进行改性。研究了KF - 6001和X - 22 - 176 - DX对聚二甲基硅氧烷改性阳离子水性聚氨酯（SiCWPUs）的胶体、物理化学和表面性能的影响。通过傅里叶变换红外光谱和扫描电子显微镜对SiCWPUs的化学结构和表面形貌进行了表征。结果表明，硅氧烷的加入改变了聚氨酯的结构和表面形貌。通过X射线光电子能谱测试了聚合物薄膜中的元素分布，并通过对薄膜表面进行水接触角测试证明了阳离子水性聚氨酯聚合物薄膜表面的疏水性效果。随着硅氧烷添加量的增加，SiCPWU1薄膜表面的硅含量从0%增加到17.92%，且薄膜表面的实际硅含量远大于理论值。因此，膜表面的疏水性急剧增加，接触角从63.0°增加到105.3°。动态力学分析表明，将聚二甲基硅氧烷引入阳离子水性聚氨酯链中会增加聚合物薄膜中的微相分离。应力 - 应变数据表明，当添加相同量的聚二甲基硅氧烷时，SiCPWU1薄膜的力学性能优于SiCPWU2薄膜。
