聚丙烯膜表面氨基化及对纳米金的吸附

Amino modification of a polypropylene membrane surface and its application in gold nano-particle adsorption

合成了一端带有蒽醌基团另一端带有氨基基团的光敏性小分子——蒽醌-己二胺,在其浓度为6.6mmol/L、光强8.5mW/cm2、光照时间为15m in的反应条件下,对流延聚丙烯薄膜(CPP)进行了表面改性;进一步研究了改性CPP对纳米金的吸附性能,并用扫描电镜表征了改性CPP吸附纳米金后的表面形貌。结果表明,对CPP进行表面氨基化改性后,它的水接触角由原来的103.5°变为68.2°,其表面亲水性得到了很大改善。光照时间对接触角也有影响,前2m in内,接触角随时间的变化比较显著,之后,随着光照时间的增长,接触角的变化就渐趋平缓。吸附纳米金后,改性CPP的表面出现了分布较均匀的颗粒形貌,与空白CPP相比,其对纳米金的吸附能力得到显著提高。

A photosensitive molecule with one end bearing an anthraquinone group and the other having an amino group has been synthesized and used for surface modification of a polypropylene （CPP） polymer using UV-induced grafting, with a photo-intensity of 8.5 mW/em2 for a time of 15 min. The modified polymer surface was character- ized by scanning electron microscopy （SEM）. It was found that the hydrophilie properties of the CPP were improved by amino modification, with the water contact angle of the CPP surface being reduced from 103.5° to a minimum of 68.2° after modification. The contact angle of the surface can be tailored by varying the irradiation time, with the variation in contact angle being most marked within the first two minutes of irradiation. Adsorption of gold nano-particles was accomplished on the modified polymer surface. The spontaneous formation of small granules of gold nano-particles on the modified CPP surface was observed by SEM.