tailieunhanh - Controlling the end-groups of Poly (3-Hexylthiophene) via Vilsmeier-haack reaction

In this study, aim to modify the end groups of P3HT via Vilsmeier-Haack reaction using POCl3 and DMF as the catalytic system. The end-groups of P3HT were characterized via FTIR and Maldi-Tof spectroscopies. | SCIENCE & TECHNOLOGY DEVELOPMENT, , - 2015 Controlling the end-groups of Poly (3Hexylthiophene) via Vilsmeier-haack reaction Lam Le1 Anh Tuan Luu2 Le-Thu Thi Nguyen2 Ha Tran Nguyen1,2 1 Materials Technology Key Laboratory, VNU-HCM 2 Ho Chi Minh City University of Technology – VNU-HCM (Manuscript Received on October 9th, 2014; Manuscript Revised November 19th, 2014) ABSTRACT π-Conjugated oligomeric and polymeric semiconductors have been the focus of intense research over the past few decades as alternatives to inorganic semiconductors for lowcost electronic applications such as organic thinfilm transistors (OTFTs), light-emitting diodes (OLEDs), and photovoltaics (OPVs). These materials enable vapor- or solution-phase fabrication of large-area, lightweight electronic devices and are compatible with plastic substrates for mechanically flexible, conformable, and wearable electronics. In this research, we aim at modification of the H/Br end groups of poly (3-hexylthiophene) to CHO/Br end groups via Vilsmeier-haack reaction using POCl3 and DMF as the catalytic system in toluene medium. The end groups of the obtained polymer were determined via FT-IR spectroscopy and were further confirmed by Maldi-ToF. The result showed that completion of the Vilsmeierhaack reaction was obtained after 24 h at 75 °C. Keywords: Poly (3-hexylthiophene), GRIM, Conjugated Polymers, Maldi-Tof spectroscopy. 1. INTRODUCTION Polythiophenes have become the subject of extensive study. These materials are viewed as Trang 40 potentially useful components in field-effect transistors, optical and electronic sensors, lightemitting devices, non-linear optical materials, etc [1,4]. TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 18, SOÁ K2- 2015 R R R R S S S S R HT - HT S S R TT - HT R R S S S S R R S S R R HH - HT HH - TT However, these polymers exhibit an intrinsic insolubility which makes purification, as well as chemical modification and .