MEH-PPV:  Improved Synthetic Procedure and Molecular Weight Control

Abstract

Mechanistic studies on the polymerization of R,R′-dibromo-2-methoxy-5-(2-ethylhexyloxy)xylene have been performed. Polymerizations were initially carried out by adding potassium tert-butoxide to monomer in the presence of a chain transfer agent, anthracene. Anthracene showed little effect on the molecular weight of the resulting polymer, suggesting that the major polymerization route was not radically initiated. Polymerizations were also carried out by adding monomer to potassium tert-butoxide in the presence of a nucleophile, 4-methoxyphenol. The molecular weight of the resulting polymer scaled linearly with the amount of 4-methoxyphenol, suggesting an anionic mechanism. In addition, each polymerization was monitored by in-situ torque measurements to further elucidate the polymerization mechanism and optimize polymerization conditions.

Luminescent Poly(p‐phenylenevinylene) Hole‐Transport Layers with Adjustable Solubility

“…Polymer Synthesis: MEH-PPV, BEH-PPV, and BEH/BB-PPV (1:3) were synthesized in our laboratory according to the procedure of Neef and Ferraris [16]. The precursors were carefully purified by crystallization (three times) and the obtained polymers were purified by a second precipitation from acetone.…”

Direct x-ray detection with conjugated polymer devices

“…11,12 MEH-PPV was synthesized following a procedure reported in the literature. 13,14 Its molecular weight, determined via gel permeation chromatography, is 2.85ϫ 10 5 g mole −1 , with a polydispersity index of 1.87. Additionally, we use poly͑9,9-dioctylfluorenyl-2,7-diyl͒ ͑PFO͒, which is a promising material for blue emission light-emitting diodes.…”

Synthesis and Characterization of MEH-PPV for Solar Cell Application

“…Firstly, we prepared Methoxy-4-(2-ethylhexyloxy) benzene and preparedα,α′ dibromo-2-methoxy-5-(2-ethylhexyloxy) xylene and finally using Gilch route to obtain the target polymer MEH-PPV as schemed in Fig. 1 (13,14) . The solid polymer is also shown in Fig.…”

“…3-6. The peaks are assigned leisurely according to the literature (13,14) . For Methoxy-4-(2-ethylhexyloxy) benzene, the five aromatic protons are assigned at6.8 ppm, 15 aliphatic protons are assigned at 0.9-1.7 ppm while the five methoxy protons are assigned at 3.7 ppm as shown in Fig.…”