改性聚乙烯亚胺/纳米银的制备及其在棉织物中的应用

为了提高聚乙烯亚胺(PEI)还原制备纳米银的能力,增加纳米银水溶液稳定性,采用化学接枝改性PEI,并探讨改性聚乙烯亚胺(MPEI)还原、控制纳米银生成的机制,实现对棉织物的抗菌整理。红外光谱分析结果表明,通过化学反应,成功将羧酸根离子和酰胺键引入PEI长链分子;X射线衍射、紫外-可见光光谱和粒径测试结果表明,MPEI能高效还原制备纳米银,所制备的纳米银溶液在1个月内保持稳定;透射电子显微镜测试结果表明,MPEI制备的纳米银尺寸呈双峰分布,生成2 nm左右的超小型纳米颗粒和10 nm左右的纳米颗粒;在常温常压条件下,棉织物通过MPEI/纳米银溶液浸渍整理,得到的抗菌棉织物对大肠杆菌和金黄色葡萄球菌的抑菌率达到95%以上。

Synthesis of modified-polyethyleneimine/nano-silver composites and application thereof on cotton fabrics

In order to improve the reduction capability of nano?silver by polyethyleneimine ( PEI ) and stabilize the nano?silver solution, a modification of PEI by chemical grafting was described in this paper. The mechanism of modified?polyethyleneimine( MPEI) was proposed, and its antibacterial application in finishing of cotton fabrics was studied. According to FT?IR, the carboxylic acid ion and the amide bond were introduced into PEI successfully by chemical reactions. XPS, UV?visible and particle size analysis showed that MPEI can not only synthesize nano?silver efficiently, but also stabilize nano?silver solution for a month at least. TEM test indicated that nano?silver synthesized by MPEI contained ultra?small spherical nanoparticles with an average diameter of 2 nm and larger particles with an average diameter of 10 nm. Under conditions of room temperature and atmosphere pressure, the bacterial reduction rates of cotton fabrics treated with MPEI/nano?silver solution against Escherichia coli and Staphylococcus aureus reached 95%.