Photochromic liquid crystal polymers

I. Cabrera*, S. Yitzchaik, V. Krongauz

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Copolymers containing both spiropyran and mesogenic groups were synthesized either by free radical polymerization or by a polymer analogous reaction. The thermal back reaction leading to equilibrium between spiropyran and merocyanine forms of the photochrome proceeds in a mesophase with much lower rate than in an amorphous phase and is controlled by the viscosity of a polymer. An interesting feature of these systems is the physical crosslinking of the macramolecules due to dimerization of the merocyanine side groups. This results in formation of a network on heating or irradiation and leads to a new interesting rheo-optical effect above the clearing point. The copolymer films above the clearing point exhibit very strong dynamic birefringence on mechanical disturbance.

Original languageAmerican English
Pages (from-to)200-201
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Issue number2
StatePublished - Sep 1988
Externally publishedYes
EventPolymer Preprints - American Chemical Society - Los Angeles, CA, USA
Duration: 25 Sep 198830 Sep 1988


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