聚(苯胺-邻六氟羟基苯胺)共聚物的合成及其性能表征

Synthesis and Characterization of Poly (aniline-co-2-(2-aminophenyl)-1,1,1,3,3,3-hexafluoropropan-2-ol)( PAH)

采用过硫酸铵作为引发剂,通过化学氧化聚合法制备了一系列可溶性的聚(苯胺-邻六氟羟基苯胺)(PAH)的共聚物。利用傅里叶红外光谱(FTIR)、核磁共振氟谱(19F-NMR)、核磁共振氢谱(1H-NMR)、凝胶渗透色谱(GPC)、紫外光谱(UV)和场发射扫描电子显微镜(FESEM)等对共聚物的化学结构和形貌等进行了表征和分析。结果表明,邻六氟羟基苯胺(HAFIP)成功导入了共聚物主链中,共聚物的数均分子量Mn介于6.51×10~4与9.04×10~4之间。HAFIP的存在抑制了共聚物的醌式结构n→π*跃迁,随着共聚物中邻六氟羟基苯胺(HAFIP)摩尔分数的增大,共聚物形貌逐渐由纳米纤维向纳米颗粒变换。与聚苯胺难于溶解于一般有机溶剂不同的是,当邻六氟羟基苯胺(HAFIP)的摩尔分数超过0.5时,共聚物可以完全溶解于四氢呋喃、乙醇、N-甲基吡咯烷酮、N,N-二甲基甲酰胺等有机溶剂中,表明HAFIP的导入,可以大幅改善聚苯胺的溶解性能,从而扩展聚苯胺的应用范围。

Soluble poly （aniline-o-2-（2-aminophenyl） -1,1,1,3,3,3-hexafluoropropan-2-ol） （ PAH ） was prepared from aniline and 2- （2-aminophenyl） - 1,1,1,3,3,3-hexafluoropropan-2-ol （HAFIP） by ehemieal oxidation polymerization with ammonium persulphate as initiator. Fourier transform infrared spectroscopy （FTIR）, JgF nuclear magnetic resonance spectroscopy （19 F- NMR）, 1H nuclear magnetic resonance spectroscopy（ 1H-NMR）, Gel permeation chromatography （GPC）, ultraviolet spectros- copy （UV） and field emission scanning electron microscopy （FESEM） were used to characterize the chemical structure and morphology of the copolymer. FTIR and NMR results confirm that 2-（2-aminophenyl）-1,1,1,3,3,3-hexafluoropropan-2-ol （HAFIP） is successfully introduced to the main chain of the copolymer. GPC results suggest that the number average molecular weight （Mn） of the copolymer is between 6. 51 × 10^4 and 9.04 × 10^4. UV indicates that the presence of HAFIP has inhibited the transition of quinone structure n →π and SEM reveals that the morphology of the copolymer is changing gradually from nanofibers to nanoparticles with the increase of mole fraction HAFIP of in copolymer. Different from polyaniline, the copolymers with HAFIP molar fraction higher than 0.5 are completely soluble in organic solvents such as tetrahydrofuran, ethanol, N-meth- ylpyrrolidone, N, N-dimethylformamide, which suggests that the introducing of HAFIP can greatly improve the solubility of polyaniline and thus widen its application field.