CHARGE-TRANSPORT OF HYDROCHLORIC-ACID DOPED POLYANILINE AND POLY(O-TOLUIDINE) FIBERS - ROLE OF PROCESSING

被引:33
作者
WANG, YZ
JOO, J
HSU, CH
POUGET, JP
EPSTEIN, AJ
机构
[1] OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210
[2] OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210
[3] DUPONT CO INC,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880
[4] UNIV PARIS 11,PHYS SOLIDES LAB,CNRS,URA 2,F-91405 ORSAY,FRANCE
关键词
D O I
10.1021/ma00098a047
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We report the results of transport (temperature dependent dc conductivity, thermoelectric power, and microwave frequency conductivity, and dielectric constant) and structural studies for hydrochloric acid doped polyaniline (PAN-HCl) fibers 4-fold stretched at 300, 350, and 400-degrees-C and the results of dc conductivity for its methyl ring-substituted derivative, poly(o-toluidine) (POT-HCl) fibers. For the PAN-HCl fibers, with increasing stretching temperatures, the system shows greater localization, as indicated by the decreasing conductivity with stronger temperature dependence and decreasing microwave dielectric constant with weaker temperature dependence. This is in accord with the observed decreasing crystallinity with increasing processing temperature. The interrupted metallic strands model is used to account for the microwave results assuming that the size of the metallic regions increases linearly with temperature. For the POT-HCl fiber, the conductivity is similar to that for the POT-HCl powder. When the fiber is stretched 3-fold, the conductivity increases almost 1 order of magnitude while the temperature dependence changes only slightly, in agreement with the short localization length in the system.
引用
收藏
页码:5871 / 5876
页数:6
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