The Synthesis And Characterization Of Novel Water-Soluble Polythiophene Derivatives

Water soluble polythiophene derivatives combined with the conductivity of traditional conjugative polymer and the water-solubility of polyelectrolytes. Furthermore, They can be synthesised very easily and are environmental friendly materials. Water-soluble polythiophene derivatives can be applied in the domains of solar and color-changed materials and biological detection.In this paper, water-soluble poly(3-thiophene formic acid) are synthesised in three different roles and are characterizated by Fourier transform infrared spectroscopy and scanning electron microscope. the method of esterification polymerization is very ideal for carboxy protection and when the mole ratio of antioxidant and monomer is 3:1 the conversion of monomer 73% is the highest.In order to explore the influence of side chain on the performance of polymer, Water soluble poly(3-thiophene sodium acetate) is synthesised. Poly(3-thiophene acetic acid) is got and characterizated by FT-IR and H1-NMR.From the UV-vis absorption spectrum of poly (3-thiophene acetic acid), The peak at 408 nm can be seen.The bandgap of the polymer is 2.25 eV. The weight-average molecular weight and polydispersity of poly(3-thiophene acetic acid) are 16200 and 2.01 respectively by gel-permeation chromatography using THF as an eluent.Poly(3-hexylthiophene) is synthesized by chemical oxidation method. The structure of P3HT is characterized by FT-IR and H1-NMR.The regioregularity of P3HT is 72%. From the UV-vis absorption spectrum of P3HT The peak at 431 nm can be seen and the bandgap is 2.67 ev. The morphology of P3HT is observated in the scanning electron microscope.In order to adjust the conjugated length Poly(3-thiophene sodium acetate)-(3-hexylthiophene) are synthesized and their structures are characterized by FT-IR.