将预先合成的聚合物PVA-DOPA与PVA 共混制备聚合物膜 PVA/PVA-DOPA；由于含儿茶酚基的3,4-二羟基苯丙氨酸(DOPA)具有氧化还原活性,可直接利用 PVA/PVA-DOPA 聚合物还原银纳米粒子并使其负载在PVA/PVA-DOPA膜表面。紫外可见光谱表明,PVA-DOPA与 Ag＋作用时,发生氧化还原反应,酚羟基被氧化成醌,在415 nm处出现特征吸收峰。通过扫描电子显微镜和透射电子显微镜,可观察到聚合物膜表面Ag纳米粒子的形态；并通过热失重分析计算出 PVA/PVA-DOPA/Ag0膜中 Ag 的负载量。抗菌性研究测试表明制得的聚合物膜具有良好的抗菌性。因而,PVA/PVA-DOPA聚合物膜可用作抗菌性包装材料、涂层材料和生物医用材料等多种功能材料。
PVA/PVA-DOPA polymer film was prepared by blending PVA and pre-synthesized PVA-DOPA. Since 3,4-dihydroxyphenylalanine (DOPA),a compound containing catechol groups,has the oxidation-reduc-tion property,Ag nanoparticles could be directly reduced and then loaded on the PVA/PVA-DOPA polymer film.UV-visible spectrum of the PVA-DOPA/Ag+ mixture showed the presence of a new broad absorption atλmax=415 nm,which assigned to the special adsorption peak of the oxidized quinone groups.This result indica-ted the occurring oxidation-reduction reaction of DOPA.SEM and TEM images of the PVA/PVA-DOPA/Ag0 films showed that the Ag0 nanoparticles were formed on the surface of the PVA/PVA-DOPAfilms.The amount of the silver nanoparticles loaded on the PVA/PVA-DOPA films was calculated by TGA diagram.Antimicrobial assessment showed that the prepared PVA/PVA-DOPA/Ag0 film has a high antibacterial activity.Thus,the PVA/PVA-DOPA polymer film has the potential applications as antibacterial package material,coating materi-al and bio-functional material in many fields.
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