Wang Jiku, Liu Xuyan, Choi Ho-Suk, Kim Jong-Hoon
Department of Chemical Engineering, Chungnam National University, Yuseong-gu, Daejeon 305-764, South Korea.
J Phys Chem B. 2008 Nov 27;112(47):14829-35. doi: 10.1021/jp806179z.
A conductive polyaniline/poly(ethylene terephthalate) (PANI/PET) composite film was fabricated via the oxidative graft copolymerization of aniline (ANI) onto the plasma-induced poly(acrylic acid) (PAAc) grafted PET surface. The attenuated total reflectance Fourier transform infrared spectroscopy spectra (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) results confirmed that PANI was successfully grafted onto the surface of the PAAc-g-PET films. The effects of the experimental conditions on the percentage of PANI grafted onto the PAAc-g-PET films were extensively investigated. A very high grafting percentage of ANI can be obtained through the acid-base reaction between the aniline monomer and PAAc on the PAAc-g-PET surface at high temperature. As a result, the grafting percentage of PANI can be increased to as high as 12.18 wt %, which causes the surface resistance of the PANI-g-PAAc-g-PET film to be reduced to about 1000 Omega/sq. We predicted that this is because of the high flexibility of the PAAc molecular chains and high solubility of aniline, both of which facilitate the binding of aniline to PAAc during this high temperature acid-base reaction. It was observed by atomic force microscopy (AFM) that the PANI-modified PET surface exhibits higher size irregularity and surface roughness, which further indicated that a much greater number of aniline molecules can be reactively bonded to and distributed along the grafted AAc chains and that the PANI-g-PAAc-g-PET surface resulting from the sequential oxidative graft copolymerization can possess higher electrical conductivity.
通过将苯胺（ANI）氧化接枝共聚到等离子体诱导的聚（丙烯酸）（PAAc）接枝的PET表面上，制备了一种导电聚苯胺/聚对苯二甲酸乙二酯（PANI/PET）复合薄膜。衰减全反射傅里叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS）结果证实，PANI成功接枝到PAAc-g-PET薄膜表面。广泛研究了实验条件对PANI接枝到PAAc-g-PET薄膜上的百分比的影响。通过苯胺单体与PAAc-g-PET表面上的PAAc之间在高温下的酸碱反应，可以获得非常高的ANI接枝率。结果，PANI的接枝率可以提高到高达12.18 wt%，这使得PANI-g-PAAc-g-PET薄膜的表面电阻降低到约1000Ω/sq。我们预测这是因为PAAc分子链的高柔韧性和苯胺的高溶解性，这两者都有助于在这种高温酸碱反应过程中苯胺与PAAc的结合。通过原子力显微镜（AFM）观察到，PANI改性的PET表面表现出更高的尺寸不规则性和表面粗糙度，这进一步表明更多数量的苯胺分子可以反应性地键合到接枝的AAc链上并沿其分布，并且由顺序氧化接枝共聚产生的PANI-g-PAAc-g-PET表面可以具有更高的电导率。
