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Antimicrobial Expanded Polytetrauoroethylene Film Prepared by γ-ray Radiation Induced Grafting of Poly(acrylic acid)
Yun-long Wang,Mo-zhen Wang*,Qi-chao Wu,Xiao Zhou,Xue-wu Ge
Author NameAffiliationE-mail
Yun-long Wang CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Mo-zhen Wang* CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China pstwmz@ustc.edu.cn 
Qi-chao Wu Guangdong Tianan New Material Co., Ltd., Foshan 528000, China  
Xiao Zhou Guangdong Tianan New Material Co., Ltd., Foshan 528000, China  
Xue-wu Ge CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Abstract:
The simultaneous γ-ray-radiation-induced grafting polymerization of acrylic acid on ex-panded polytetra fluoroethylene (ePTFE) lm was investigated. It was found that the degree of grafting (DG) of poly(acrylic acid) (PAA) can be controlled by the monomer concentration, absorbed dose, and dose rate under an optimal inhibitor concentration of [Fe2+]=18 mmol/L. SEM observation showed that the macroporous structure in ePTFE films would be covered gradually with the increase of the DG of PAA. The prepared ePTFE-g-PAA film was im-mersed in a neutral silver nitrate solution to fabricate an ePTFE-g-PAA/Ag hybrid film after the addition of NaBH4 as a reduction agent of Ag to Ag atom. SEM, XRD, and XPS results proved that Ag nanoparticles with a size of several tens of nanometers to 100 nanometers were in situ immobilized on ePTFE film. The loading capacity of Ag nanoparticles could be tuned by the DG of PAA, and determined by thermal gravimetric analysis. The quan-titative antibacterial activity of the obtained ePTFE-g-PAA/Ag hybrid lms was measured using counting plate method. It can kill all the Escherichia coli in the suspension in 1 h. Moreover, this excellent antibacterial activity can last at least for 4 h. This work provides a facile and practical way to make ePTFE meet the demanding antimicrobial requirement in more and more practical application areas.
Key words:  Expanded polytetra uoroethylene film, Radiation grafting, Poly(acrylic acid), Silver nanoparticles, Antibacterial property
FundProject:
辐射接枝法制备膨化聚四氟乙烯杂化膜及其抗菌性表征
王运龙,汪谟贞*,吴启超,周晓,葛学武
摘要:
通过共辐射接枝的方法,将聚丙烯酸成功接枝到膨化聚四氟乙烯薄膜上. 采用NaBH4还原吸附在接枝链上的银离子,在膜中原位负载银纳米粒子,制备了抗菌性ePTFE杂化膜. 杂化膜的SEM、XPS、XRD和TGA表征结果表明,负载的银纳米粒子粒径为几十纳米至100 nm. 而银纳米粒子的负载量可由聚丙烯酸的接枝率控制. 细菌平板计数法测试结果证明,所制备的杂化膜具有优异的抗菌性,对大肠杆菌的抗菌率高达100%.
关键词:  膨化聚四氟乙烯薄膜,辐射接枝,聚丙烯酸,纳米银,抗菌性
DOI:10.1063/1674-0068/28/cjcp1410180
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