Diblock copolymers poly(3-hexylthiophene)-block-poly(2-(dimethylamino)ethyl methacrylate-random-1-pyrenylmethyl methacrylate), controlled synthesis and optical properties

In this research, diblock copolymers based on the rod segment of regioregular poly(3-hexylthiophene) (P3HT) and a coil segment of poly(2-(dimethylamino)ethyl methacrylate-random-1-pyrenylmethyl methacrylate) (P(DMAEMA-r-PyMA)) was synthesized successfully by Grignard metathesis (GRIM) method and atom transfer radical polymerization reaction (ATRP). The obtained copolymer was well-defined with an average molecular weight of 11300 g/mol and low polydispersity below 1.5. The polymer structure was determined via gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopies. In addition, the optical and thermal properties of polymers were characterized via ultraviolet–visible (UV–Vis), differential scanning calorimetry (DSC) spectroscopy and fluorescence spectroscopy. Interestingly, P3HT-b-P(DMAEMA-r-PyMA) was examined as a possible chemosensor for trace detection of the trinitrotoluene (TNT) explosive.