View Full Document

Experimental Evidence for the Quasi-



View the full content.
View Full Document
View Full Document

7 views

Unformatted text preview:

Macromolecules 2005 38 8649 8656 8649 Experimental Evidence for the Quasi Living Nature of the Grignard Metathesis Method for the Synthesis of Regioregular Poly 3 alkylthiophenes Mihaela Corina Iovu Elena E Sheina Roberto R Gil and Richard D McCullough Department of Chemistry Carnegie Mellon University Pittsburgh Pennsylvania 15213 Received May 31 2005 Revised Manuscript Received August 15 2005 ABSTRACT The Grignard metathesis GRIM polymerization of 3 alkylthiophenes proceeds by a quasi living chain growth mechanism not by a step growth process Kinetic studies of the Grignard metathesis polymerization of 2 5 dibromo 3 alkylthiophenes showed that the molecular weight of poly 3 alkylthiophenes is a function of the molar ratio of the monomer to nickel initiator and conducting polymers with predetermined molecular weights and relatively narrow molecular weight distributions PDIs 1 2 1 5 can be made Sequential monomer addition resulted in new block copolymers containing different poly 3 alkylthiophene segments Introduction Conventional design of advanced organic materials that display a variety of desirable properties in a controllable way continues to be one of the great challenges of the contemporary polymer research One class of these advanced materials is organic conducting polymers Since the initial discovery of these polymers in the late 1970s various applications of these materials have been explored due to their exceptional electronic and photonic properties 1 3 The straightforward synthesis of polythiophene derivatives PT generates soluble and processable polymers with a wide range of practical and potential applications including rechargeable batteries 1 electrochromic devices 1 chemical and optical sensors 1 lightemitting diodes 4 6 and field effect transistors 7 While traditional approaches to synthesizing PTs derivatives via electrochemical or oxidative chemical polymerization methods yield polymers with various degrees of regioregularity 3 the



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Experimental Evidence for the Quasi- and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Experimental Evidence for the Quasi- and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?