| Abstract: | This paper deals with the relation between polymerization time and poly(p-phenylene) (PPP) yield in the synthesis of PPP by the Kovacic method. It is found that the reaction is uniform in the polymerization time range of less than 2 hr, with a PPP yield of up to about 60%, and then the yield increases a little with an increase of polymerization time. It has been found from the infrared spectra that the mainchain structure of PPP obtained from different polymerization times is exactly the same without orthoand meta-polymers. However there is a chlorine substitution for hydrogen on the phenyl rings, and the substitution quantity increases with the extension of reaction time. The reason why there is a great difference in conductivity appears with FeCl3 doping is also studied, and we find it is related to different degrees of rinsing in the doping process. |
