Synthesis and properties of oxetane monomers and oligomers with electro-active pendent groups

• Published in: Polymer international Vol. 57; no. 9; pp. 1036 - 1041
• Main Authors: Stanionyte, Rasa, Buika, Gintaras, Grazulevicius, Juozas V, Grigalevicius, Saulius
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.09.2008; Wiley
• Subjects: Applied sciences; Electrical, magnetic and optical properties; Exact sciences and technology; hole drift mobility; ionization potential; oligomer; optoelectronics; Organic polymers; oxetane; Physicochemistry of polymers; Properties and characterization; Ring opening polymerization; Electrical properties; Indole derivative polymer; Hole mobility; Cationic polymerization; Oxetane derivatives; Experimental study; Oligomer; Organic solution; hole drift mobility; Cyclic ether polymer; Amine polymer; Optical properties; Preparation; Carbazole derivative polymer; Ionization potential; Electric field effect; optoelectronics; Drift mobility; Film forming properties; oxetane
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/pi.2443

BACKGROUND: Monomers and polymers carrying pendent electro‐active fragments are widely studied due to their application in various optoelectronic devices. Monomers containing triphenylamino, triphenyldiamino and carbazol‐9‐yl fragments with vinyl, epoxy or acryl functional groups are mostly used. The synthesized materials are used for preparation of hole transport layers as well as host materials for electrophosphorescent light‐emitting diodes. Much fewer presentations are reported on the preparation of monomers containing other electro‐active or functional groups. RESULTS: Here we describe oxetane monomers and their oligomers containing various electro‐active pendent groups. The weight‐average molecular weights of the oligomers are in the range 1420–3250 g mol−1 with a molecular weight distribution of 1.7–4.1. The electron photoemission spectra of amorphous layers of the compounds established ionization potentials of 5.55–5.85 eV. Room temperature hole drift mobility in the layers of some oligomers exceeds 10−7 cm2 V−1 s−1 at high electric fields. CONCLUSION: The synthesized oligomers exhibit promising thermal and film‐forming properties. Amorphous layers of some of the materials demonstrate suitable ionization potentials and sufficient hole transport properties for their application in optoelectronic devices. Copyright © 2008 Society of Chemical Industry