文献类型：期刊文献

英文题名：A novel approach to prepare high antibacterial polylactic acid surface encapsulated nano-silver through stereocomplexation

作者：Dai, Guangyao[1];Tang, Songchao[1];Wang, Tinglan[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Preparat & Applicat Ultrafine Mat, Polymer Proc Lab,Minist Educ, Shanghai 200237, Peoples R China

年份：2019

卷号：6

期号：5

外文期刊名：MATERIALS RESEARCH EXPRESS

收录：;EI(收录号：20191106632005);WOS:【SCI-EXPANDED(收录号:WOS:000458216600001)】；

基金：The authors acknowledge the financial support from the National key R&D Program of China (2017YFB0306701).

语种：英文

外文关键词：polylactic acid; ATRP; stereocomplex; antibacterial

摘要：Poly(lactic-b-4-vinylpyridine) (PDLA-b-P4VP) was first synthesized by atom transfer radical polymerization (ATRP), and then it was introduced into the surface of polylactic acid material through PLLA/PDLA stereocomplexation. After soaking in AgNO3 solution, the antibacterial polylactic acid material surface was obtained. The structures and properties of PDLA-b-P4VP, PLLA/PDLA-b-P4VP and PLLA/PDLA-b-P4VP/Ag were characterized by gel permeation chromatography, magnetic resonance spectroscopy, x-ray diffraction, differential scanning calorimetry, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscope and antibacterial experiment. The results showed that PDLA-b-P4VP block with different chain length were synthesized successfully and compounded on the surface of PLLA material by stereocomplexation, which made the thermal stability of the surface of the PLLA material improved. After soaking in AgNO3 solution, nano-silver was prepared through reducing Ag+ in situ and evenly dispersed on the surface of the PLLA material. After ultrasonic washing, a large amount of nano-silver remains, and the antibacterial rate of the surface of the material against E. coli reaches 100%, which had a strong antibacterial effect.