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Nonthermochromic Forms of the Polydiacetylene ETCD

Published online by Cambridge University Press:  16 February 2011

Daniel J. Sandman ,
Milton J. Downey  and
Sandra H.W. Hankin
Daniel J. Sandman
Affiliation:
Center For Advanced Materials, Department Of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854
Milton J. Downey
Affiliation:
Center For Advanced Materials, Department Of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854
Sandra H.W. Hankin
Affiliation:
GTE Laboratories Incorporated, 40 Sylvan Road, Waltham, Massachusetts 02254
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Abstract

Subjecting crystals of the thermochromic polydiacetylene (PDA) from the bis (ethyl ure thane) of 5,7-dodecadiyne-1, 12-diol (ETCD) to the solvents chlorobenzene and ?,?-dimethylformamide above the thermochromic transition temperature of PDA-ETCD irreversibly converts the material to nonthermochromic forms. These new forms have been characterized by their structural, thermal, and spectral properties. The materials isolated after exposure to chlorobenzene are highly crystalline with a structure that has expanded and disordered, yet is still related to that of the pristine polymer. The observed properties are discussed in the framework of the crystal structure-thermochromism relationship for urethane-substituted PDA.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 101
Copyright
Copyright © Materials Research Society 1994

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