TITLE:
Thermochromic Biopolymer Based on Natural Anthocyanidin Dyes
AUTHORS:
Detlef Lötzsch, Ralf Ruhmann, Arno Seeboth
KEYWORDS:
Thermochromism; Biopolymer; Anthocyanidin
JOURNAL NAME:
Open Journal of Polymer Chemistry,
Vol.3 No.3,
July
29,
2013
ABSTRACT:
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.