Author(s)

Rajiv K. Singh, Amit Kumar, Khushboo Agarwal, Deepshikha Dwivedi, Keadar N. Sood, Ramadhar Singh

Department of Physics, Department of Kanya Gurukul, Gurukul Kangri University, Haridwar, India.
National Physical Laboratory, Council of Scientific & Industrial Research, New Delhi, India.

Poly(2,5-dimethoxyaniline) (PDMA) has been synthesized by chemical oxidative polymerization technique using varying ratio (wt/wt) of binary oxidants; ferric chloride (FeCl₃) and ammonium persulfate (APS). Fourier transform infrared (FT-IR) and ultraviolet-visible (Uv-vis) spectroscopic investigations provide the evidence of the presence of both benzenoid and quinoid ring units. The thermal analysis and structural characterization data suggests that the oxidant ratio greatly controls the molecular ordering in PDMA. Surface morphology shows the existence of both amorphous and crystalline domains wherein the crystalline domain size depends on the oxidant ratio. The dc conductivity (σdc) of PDMA is also a function of binary oxidant ratio and at FeCl₃:APS (50:50), it increases by two orders of magnitude. Films of PDMA synthesized using FeCl₃:APS (50:50) binary oxidant exhibits a decrease in the surface current on exposure to ammonia gas.

Poly(2, 5-Dimethoxyaniline); Binary Oxidant; Structured Polymer; DC Conductivity

R. Singh, A. Kumar, K. Agarwal, D. Dwivedi, K. Sood and R. Singh, "Influence of Binary Oxidant (FeCl₃:APS) Ratio on the Spectroscopic and Microscopic Properties of Poly(2,5-Dimethoxyaniline)," Open Journal of Polymer Chemistry, Vol. 2 No. 3, 2012, pp. 105-112. doi: 10.4236/ojpchem.2012.23014.