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Langmuir-Blodgett Film of a Processable Polydiacetylene with Tricyanovinyldialkylaniline Chromophore

Published online by Cambridge University Press:  21 March 2011

D.-C. Lee ,
L. Li ,
L. A. Samuelson  and
D. J. Sandman
D.-C. Lee
Affiliation:
Center for Advanced Materials and Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854-2881
L. Li
Affiliation:
Molecular Technologies Inc., Westford, MA 01886
L. A. Samuelson
Affiliation:
Materials Science Team, Natick Soldier Center, US Army Soldier, Biological Chemical Command, Natick, MA 01760
D. J. Sandman
Affiliation:
Center for Advanced Materials and Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854-2881
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Abstract

A soluble and processable polydiacetylene (PDA) with functionalizable N,N-dialkylaniline and glutamate ester substituted alkylurethane side groups was synthesized. This PDA was further reacted with tetracyanoethylene to effect postpolymerization functionalization. This new strategy further functionalizes conjugated polymers and introduces a tricyanovinyl (TCV)-aniline chromophore. The resulting polymer was soluble in common organic solvents. Asymmetric multilayers of the tricyanovinylated PDA were fabricated using the Langmuir-Blodgett (LB) technique. Thickness, visible absorption, and second harmonic (SH) intensity were found to increase linearly as a function of the number of layers. Polarized UV-visible and IR studies revealed that the main chain preferentially orients vertical to the compression direction with out-of-plane orientation of the TCV-aniline group with respect to the glass substrate. The resonant enhanced second-order nonlinear optical (NLO) coefficient (d33) of the 20 LB layers was found to be 21 pm/V at 1.064 µm, while no SHG signal was observed for cast or spincoated films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 598: Symposium BB – Electrical, Optical, & Magenetic Properties...V , 1999 , BB3.14
Copyright
Copyright © Materials Research Society 1999

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