Acrylic Polymer and Charge Transport Material

Isotactic and syndiotactic poly(9-fluorenyl methacrylate)s have been prepared that are effective as hole mobility charge transport materials and as electrical conductors of charge transport materials. 

A 200 ml reaction flask charged with 9-fluorenol (11 mmol), 180 ml of benzene, and triethylamine (13.75 mmol) was cooled to 6°C and then treated with the slow addition of methacryloyl chloride (13.75 mmol). Thereafter the mixture was stirred at ambient temperature for 24 hours. The solution was washed with water and saturated NaHCOs, and the organic layer was isolated, dried with MgS04, and concentrated. The residue 

A 25 ml reaction tube was charged with the Step 1 product (0.687 mmol), dissolved in 3.2 ml of THF, and then cooled to —78°C and treated with 0.07 ml of 1.36 M t-BuLi (0.095 mmol). The mixture reacted at —78°C and was quenched with 2 ml of methanol. The solution was precipitated in 30 ml of methanol and isolated. The precipitate was dissolved in 30 ml hexane, filtered, and concentrated, and 0.147g product was isolated having a M of 2600 daltons with a PDI of 1.25. 

Measurement of Hole Mobility of Charge Transport Material (TOP Method) 

A CH2CI2 solution consisting of 10 wt% of the Step 2 product and 1 wt% of 2,4,7-trinitrofluorene malononitrile as dopant was prepared and cast onto an ITO glass substrate, dried a 1 pm film was isolated. Aluminum was then vacuum deposited onto the film to a thickness of 1000 A forming a 5 x 5 mm aluminum electrode. Hole transfer time was measured by applying a voltage of 5 V to the electrode while simultaneously exposing it to a pulse laser beam at 337 nm. 

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Title Acrylic Polymer and Charge Transport Material... 

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