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THERMOCHROMIC EFFECTS OF LEUCO DYES STUDIED IN POLYPROPYLENE

Arno Seeboth

Fraunhofer Institute for Applied Polymer Research, Volmerstrasse 7B, 12489 Berlin, Germany

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Detlef Lötzsch

Fraunhofer Institute for Applied Polymer Research, Volmerstrasse 7B, 12489 Berlin, Germany

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Elvira Potechius

Fraunhofer Institute for Applied Polymer Research, Volmerstrasse 7B, 12489 Berlin, Germany

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, and

Renate Vetter

Fraunhofer Institute for Applied Polymer Research, Volmerstrasse 7B, 12489 Berlin, Germany

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Abstract

A series of thermochromic polypropylene foils were prepared by embedding various leuco dye-developer-solvent systems in the polymer matrix. Bisphenol A, laurylgallate, ethylgallate and p-hydroxybenzoic acid methyl ester were used as developers, crystal violet lactone and 3,3-bis-(1-n-butyl-2-methyl-3-indolyl)-phthalide as dyes and 1-octanoic acid methyl ester as solvent. The molar ratio between the three components of the investigated leuco dye-developer-solvent systems was kept constant. All obtained polypropylene foils exhibit an excellent thermochromic behavior. The foils, prepared by extrusion technology, switch from color to colorless with increasing temperature. The influence of molecular structure of the developer on the intensity of the colored state and the influence of a developer-surfactant complex on the resulting thermochromic properties were investigated. The results are presented and discussed in detail according to a molecular model suggesting that the ring-opening process of the leuco dye is triggered by the formation of dye-developer complexes via H-bondings.

This work was financially supported by the Bundesministerium für Bildung und Arbeit (No. 0329820E).

Keywords:

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