表面接枝含氟苯乙烯共聚物的聚酯薄膜制备与表征

PREPARATION AND CHARACTERIZATION OF GRAFTED POLYESTER FILMS BY FLUOROPOLYMER

利用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)薄膜表面接枝苯乙烯和4-氟苯乙烯的共聚物.研究不同反应时间和不同配比下接枝共聚物对聚酯薄膜表面组成、结构和性能的影响.通过傅利叶变换红外光谱仪(ATR/FTIR),X-射线光电子能谱仪(XPS),凝胶渗透色谱(GPC)和扫描电子显微镜(SEM)对接枝改性前后PET薄膜的表面组成,结构和形貌进行分析;利用接触角测试和表面能计算对比研究接枝改性前后PET薄膜的表面性能.结果表明反应时间和单体百分含量对接枝百分率及接触角有一定的影响,随着反应时间的增长,聚酯薄膜表面接枝百分率增大,接触角增加,表面自由能下降.

The fluoropolymer composed of styrene and 4-fluorine styrene was grafted from the surface of PET films via surface initiated atom transfer radical polymerization （SI-ATRP）. The influences of different grafting times and composition of monomers on the surface composition, structures and morphology were studied. The surface composition and structures of the modified PET films were characterized by X-ray photoelectron spectroscopy （XPS） , Fourier transform infrared spectroscopy （FTIR/ATR） and gel permeation chromatography （GPC）. And the results could confirm the successfully grafting of initiators and polymers from the surface of PET films. The surface properties were measured by contact angle measurements. The data of contact angle showed that the surface properties of PET films were related to the reaction time and monomer percentage. As the reaction time increased, the grafting rate and the contact angle of PET films increased, but the surface energy decreased. The contact angle increased from 68°to a maximum of 98°after modifications, and the maximum of the grafting rate reached 20.33%. The surface morphologies of PET film and modified PET film were studied by SEM. After modification the PET film surface had been changed from smooth surface into rough surface.