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Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes

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DOI: 10.4236/ojpchem.2013.33009    3,961 Downloads   7,666 Views   Citations


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.

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The authors declare no conflicts of interest.

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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