OJPChem  Vol.3 No.3 , August 2013
Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

Recently a novel thermochromic poly(lactic acid) (PLA)-composite material was presented. Depending on temperature the incorporated anthocyanidin dye was found to be present either in its neutral or anionic anhydrobase form. A reversible formation of PLA-dye complexes triggered by conformational changes of the polymer backbone was proposed to explain this thermochromic effect. In order to study the influence of the dye structure on the PLA-dye complex formation and on the thermochromic properties of the PLA-composite material a variation of the anthocyanidin dye structure was investigated. The results indicate that a hydroxyl group in 3’-position of the anthocyanidin dye resulting in the presence of adjacent hydroxyl groups is mandatory for the PLA-anthocyanidin dye complex formation and thus for the occurrence of thermochromism.

Cite this paper
D. Lötzsch, R. Ruhmann and A. Seeboth, "Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes," Open Journal of Polymer Chemistry, Vol. 3 No. 3, 2013, pp. 43-47. doi: 10.4236/ojpchem.2013.33009.
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