目的 提高 PET 材料的表面亲水性。 方法 氯化亚锡与 PET 共混成膜后,采用共混接枝法,在共混膜表面接枝氨基化改性的纳米二氧化硅,制备出强亲水的 PET 材料。 采用静态接触角、傅里叶变换红外光谱仪、原子力显微镜测试手段对 PET 材料表面进行表征。 结果 氨基化改性的纳米二氧化硅能够成功接枝在氯化亚锡与 PET 共混材料表面。 当氯化亚锡质量分数为 0. 3% 时,共混膜接触角由 98°下降到 74. 5°。 共混膜接枝氨基化改性的纳米二氧化硅溶液 20 h 时,PET 材料表面接触角由 74. 5°下降到7. 8°,亲水性得到了极大提高。 接枝膜浸泡于蒸馏水 10 d 后,PET 材料表面接触角由 7. 8°上升至 34. 9°。结论 氯化亚锡与 PET 材料共混,接枝氨基化改性的纳米二氧化硅后极大地提高了 PET 材料表面的亲水性。

Objective To improve the surface hydrophilicity of PET materials. Methods In this paper, highly hydrophilic PET materials were prepared by blending with SnCl2 and then grafting amination-modified nano-silica on the surface of the blended film. The surface properties of PET materials were characterized by static contact angle measurement, Fourier transformed infrared spec- troscopy and atomic force microscopy. Results The results showed that amination-modified nano-silica was successfully grafted on the surface of the SnCl2 / PET blended materials. When the content of SnCl2 was 0. 3% in PET materials, the surface contact angle of blending membrane dropped from 98° to 74. 5°. The surface contact angle of PET materials dropped from 74. 5° to 7. 8° after the blending membrane was grafted with amination-modified nano-silica for 20 h, and the hydrophilicity was increased dramatically. The surface contact angle of PET materials increased from 7. 8° to 34. 9°after the grafted membrane was soaked in distilled water for 10 d. Conclusion The surface hydrophilicity of PET materials was improved greatly by blending with SnCl2 and then grafting amina- tion-modified nano-silica.