苯胺与吡咯共聚物空心球的自组装制备及性能

以碱性溶液为反应介质,苯胺和吡咯为单体,采用稀释聚合法制备苯胺-吡咯共聚物自组装空心微球.研究了搅拌条件、共聚单体摩尔比、聚合反应介质和聚合时间对共聚物形貌的影响.采用扫描电子显微镜、透射电子显微镜、红外光谱、广角X射线衍射、热重分析仪和四探针技术表征了共聚物的形貌、结构和性能.研究结果表明,聚合反应条件对共聚物的形貌有重大影响,通过调整聚合反应条件,可以实现共聚物形貌的有效调控.共聚单体总摩尔浓度为0.05 mol/L,氨水溶液作为反应介质,在静态条件下反应24 h可以得到尺寸均一、平均外直径为610～863 nm,壳厚144～162 nm的自组装共聚物空心微球.同时,研究了共聚物对银离子的吸附性能,结果表明共聚物对银离子有还原作用,吸附后共聚物表面有纳米银的生成.

SELF-ASSEMBLY PREPARATION AND PROPERTIES OF POLY (ANILINE-co-PYRROLE) HOLLOW SPHERES

Self-assembled poly(aniline-co-pyrrole)(PACP) hollow spheres were prepared via dilute polymerization under an unstirred condition using ammonia as a polymerization medium.The morphology of the PACP copolymers was studied by choosing several important parameters such as stirring condition,comonomer molar ratio,synthetic media and polymerization time.The morphology,structure and properties of the PACP copolymer spheres were characterized by scanning electron microscopy,transmission electron microscopy,FTIR,wide angle X-ray diffraction,thermogravimetric analysis and four-probe technique.It was found that the above-mentioned polymerization conditions had important influence on the morphology of the PACP copolymers.The polymerization parameters could be used to guide the PACP copolymer morphology from flower-like structures to hollow spheres in polymerization process.Uniform self-assembled PACP copolymer hollow spheres with outer diameter and shell thickness of 610～863 nm and 144～162 nm,respectively,formed under the optimal polymerization conditions of an unstirred condition,comonomer concentration of 0.05 mol/L in ammonia solution for 24 h.Moreover,the Ag(Ⅰ) ions adsorbability of the PACP copolymer spheres was examined.TEM and wide angle X-ray diffraction results showed that silver nanoparticles with 10～30 nm size were homogeneously dispersed in the PACP copolymer hollow spheres after adsorption,indicating that the copolymer spheres would had reactive adsorbability of Ag(Ⅰ) ions.