Preparation and Characterization of Polymeric PVDF/PDDA Ultrathin Films

A new method for the production of nanoscaled polymeric multilayer films of ferroelectric PVDF is presented.The ultrathin multilayer films of poly diallyldimethylammonium chloride (PDDA) and polyvinylidene fluoride (PVDF) have been prepared on fuzed quartz substrate by the layer-by-layer self-assembly (LbL-SA) method.The PDDA/PVDF multilayer films with the thickness of 30 nm to 150 nm have been characterized by quartz crystal microbalance (QCM) and infrared spectra (IR) The QCM reveals that the alternant ultrathin films of PVDF and PDDA are well order assembled.The electric property of the ultrathin PDDA/PVDF multilayer films at room temperature is investigated.Experimental results show that property of ultrathin films differed from that of the thick films.

PVDF／PDDA静电自组装超薄膜的制备与表征

提出了一种制备纳米量级铁电聚合物PVDF/PDDA超薄膜的新方法。聚二烯丙基二甲基氯化铵(PDDA)和极化处理后的聚偏氟乙烯(PVDF)复合超薄膜是通过层与层的静电自组装(LbL-SA)方法制备的,厚度约30～150nm,每层膜厚度约为9nm。PVDF/PDDA多层膜通过石英晶振微天平(QCM)、红外频谱仪、原子力显微镜(AFM)进行了测试与表征。QCM表征结果表明,PVDF与PDDA超薄膜能较好地交替组装;AFM表明PVDF/PDDA聚合物超薄膜的表面均匀、薄膜致密。与PVDF厚膜的电阻性能相比,PVDF/PDDA复合超薄膜的电阻性能有了很大提高。