表面改性在提高硅胶基体与抗菌涂层结合力中的应用

聚合物基体与抗菌涂层间结合力的大小至关重要，它决定了抗菌制品的使用寿命与抗菌效果。本研究中采用γ射线辐射改性聚合物基体表面，并接枝偶联剂（γ-APTS）获得活性表面，从而制得紧密键合在基体表面的 Ag-PTFE复合抗菌涂层。通过扫描电子显微镜（SEM）观察涂层表面形貌，X射线能量色散谱（EDS）与面分布表征涂层中各元素分布状况；ASTM D-3359法测试涂层与基体间结合力；通过对多组大肠杆菌的抑菌环试验与震荡烧瓶实验表征涂层抗菌活性。结果表明，γ射线辐照可有效提高聚合物基体表面活性，显著提高了涂层与基体间结合力，且抗菌效果优异。

Effect of surface modification on adhesion improvement between the silicon rubber substrate and antibacterial composite coatings

Adhesion between matrix and coatings is important which affects the performance of antibacterial products. In this study，Ag-PTFE composite antibacterial coatings were formed on the silicon rubber surface which was first modified by γ-ray irradiation followed by silane coupling agent （γ-APTS） grafting. The capture of antibacterial particles by the active substrates surface enhances the adhesion between substrates and coatings. Scanning electron microscopy （SEM） analysis was conducted to reveal the surface morphology；Energy-dispersive X-ray spectroscopy （EDS） and mapping were applied to test the composition of coatings and distribution of elements. ASTM D-3359 was used to evaluate the adhesion between matrix and coatings. Inhibition halo test and shake flask test towards Escherichia Coli were employed to determine the antibacterial property. The results show that γ-ray irradiation activates the silicon rubber surface and therefore dramatically enhances the adhesion between matrix and coatings. The sample has excellent antibacterial performance.