聚酯薄膜表面接枝含硅氧烷共聚物及微生物黏附性研究

Adhesion of Bacteria on Polyester Films Grafted by Siloxane-containing Copolymer

通过表面引发原子转移自由基聚合(SI-ATRP)在聚对苯二甲酸乙二醇酯(PET)薄膜表面接枝聚苯乙烯-聚二甲基硅氧烷嵌段共聚物(PET-g-PS-b-PDMS),制备具有强疏水性表面的聚酯薄膜.利用X-射线光电子能谱仪(XPS),傅里叶变换红外光谱仪(FTIR/ATR),场发射扫描电镜(FESEM)对改性前后聚酯薄膜的表面组成、结构和形貌进行分析与表征;利用接触角测试仪和微生物黏附实验对比研究接枝改性前后PET薄膜的润湿性和对微生物黏附性的影响.结果表明,随反应时间延长,聚酯薄膜表面接枝量增加,水接触角增大.当接枝聚合反应时间为12 h,接枝密度可达0.72 mg/cm2,接触角达到126°,薄膜表面细菌黏附量也随之降到最低.

The polystyrene-polydimethylsiloxane copolymer（ PS-b-PDMS） was grafted from the surface of polyethylene terephthalate（ PET） film via surface-initiated atom transfer radical polymerization（ SI-ATRP）.The ATRP was carried out at 90 ℃ in the presence of Cu Cl as a catalyst,2,2-bpy as a complexing agent,and toluene as a reaction medium. The influences of different reaction times on the surface composition,structures,morphology and properties of polyester films were studied. X-ray photoelectron spectroscopy（ XPS）,Fourier transform infrared spectroscopy（ FTIR / ATR）,scanning electron microscopy（ SEM） were used to characterize the surface composition,structure and morphology of modified polyester film. And the results could confirm the successfully grafting of initiators and polymers from the surface of PET films. The wettability and effect on bacterial adhesion of modified PET films were measured by contact angle and microbial adhesion tests. The data of contact angle showed that the surface properties of PET films were related to the reaction time. The grafting density and contact angle of PET films increased as the reaction time inereased. It suggests that the SIATRP is a ＂living＂radical polymerization. Further more,the grafting rate was up to 0. 72 mg / cm2,and the contact angle increased to 126° when the polymerization time was 12 h,meanwhile,the amount of bacterial adhesion was significantly reduced.