含苯胺低聚物侧链的导电共聚物的合成与性能研究

SYNTHESIS AND PROPERTIES OF NOVEL CONDUCTIVE GRAFT COPOLYMERS WITH OLIGOANILINE SIDE CHAINS

通过高分子反应合成了含有不同长度苯胺链段的聚甲基丙烯酸类接枝聚合物 ,研究结果发现 ,当苯胺链段达到一定长度时 ,经质子酸掺杂后的聚合物具有一定的电导性 ,其中 ,接枝苯胺八聚体的共聚物经质子酸掺杂后其电导率可以达到 10 - 5S cm .

Novel conductive graft copolymers with oligoaniline side chains were synthesized by the reaction of oligoaniline with polymethacrylic chloride. Conjugated oligoanilines,tetraaniline (TA) and octaaniline (OA) were introduced into PMAA and P(MAA co MMA) main chains to combine the specific properties of oligoanilines and the desirable mechanical strength and film forming properties of polymers.Four graft copolymers were synthesized in this work:PMAA g TA,PMAA g OA,P(MAA co MMA) g TA and P(MAA co MMA) g OA,which were characterized by 1H NMR,FTIR,elementary analysis and thermogravimetric analysis.Compared with their original polymers,the thermal stability of the graft copolymers was improved to a certain extent.Some of these copolymers showed electrical properties similar to polyaniline,exhibiting different states of oxidation, i.e., fully reduced,partially oxidized and fully oxidized states.Doped copolymers grafted with tetraaniline,PMAA g TA and P(MAA co MMA) g TA,did not show conductivity because their effective doped aniline lengths were less than four aniline units.On the other hand,copolymers grafted with octaaniline side chains,PMAA g OA and P(MAA co MMA) g OA,can be doped,and the protonic doped copolymers may exhibit a conductivity value up to 10 -5 ?S/cm. It suggests a new way to prepare conductive polymer materials, which are superior to conventional conductive polymer blends with unstable properties due to phase separation and have much better processibility than polyaniline.