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.
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