| 초록 |
Nanoscaled hybrid composite films of poly(vinylsilsesquioxane) (PVSSQ) and polyimide (PI) (PI/PVSSQ) were prepared via sol-gel process and thermal imidization from 3,3/,4,4/-biphenyltetracarboxylic dianhydride (BPDA)-p-phenylene diamine (PDA) polyamic acid (BPDA-PDA PAA). We investigated the structure, interaction and optical, thermal, dielectric and mechanical properties of the hybrid composite films. The phase morphologies and interfacial interaction were evaluated by scanning electron microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). It was found that the surface morphology was influenced by the composition of PVSSQ. The transparency of the hybrid films was found to be dependent on the PVSSQ content. Incorporating of the PVSSQ increased the thermal stability and Tg of the hybrid composites. Dielectric constants of the hybrid films were in the range of 2.37 - 3.59. The properties of the PI films were significantly enhanced by adding 5 – 30 wt% of vinylsilsesquioxane (VSSQ). For comparison, we also prepared the hybrid composites of PI and mixtures of VSSQ and tetraethoxysilane (TEOS) and PI/TEOS hybrid composites containing 30wt% of TEOS. |
