表面温度敏感性聚酯薄膜的制备

PREPARATION OF POLYESTER FILMS WITH THERMOSENSITIVE SURFACE

通过在聚酯(PET)薄膜表面固定原子转移自由基聚合(ATRP)的引发基团,继而引发接枝聚N-异丙基丙烯酰胺(NIPAM),制备表面具有温度敏感性的聚酯薄膜.利用X射线光电子能谱仪(XPS),衰减全反射傅立叶变换红外光谱仪(FTIR/ATR),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与表征;利用接触角测试仪对比研究接枝改性前后PET薄膜的表面性能;研究数据表明,随着反应时间的延长,接枝到PET薄膜表面PNIPAM的量在增加.当接枝聚合反应时间为16 h,接枝量达到0.239mg/cm2.表明SI-ATRP具有一定的"活性"特征;接枝PNIPAM改性后的PET薄膜表现出对温度的刺激响应性.

In order to obtain functionalized PET lms with thermosensitive surface,thermoresponsive polymer,poly（N-iso-propylacrylamide） （PNIPAM） was grafted from the surface of PET films via surface initiated atom transfer radical polymerization （SI-ATRP）.Polar groups of carboxyl were produced on the surface of PET lms through alkaline hydrolysis and oxidation,then the ATRP initiator was immobilized on the surface of PET lms.And the ATRP was carried out at 30 ℃ in the presence of CuCl as a catalyst,ME6TREN as a ligand,and （30 ∶70,V/V） acetone/H2O as a reaction medium.The composition,structure and morphology of the surface of PET film and modified PET films were characterized by attenuated total reflection Fourier transform infrared spectroscopy （FTIR/ATR）,X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy （SEM）.And the surface properties of modified PET films were studied by contact angle measurements.The data showed that the structure and composition of the polyester film were changed after grafting,which demonstrated the successfully grafting of PNIPAM from the surface of PET films.Further more,with the increase of the reaction time,the grafting rate on the film surface increased,the grafting density increased to 0.239 mg/cm2 when the polymerization time was 16 h.It suggests that the SI-ATRP is a ＂living＂ radical polymerization.And the PET films modified by PNIPAM layers were stimulus-responsive with temperature indicating the successful functionalization of PET films.