Abstract
Chromic dyes responding against external stimuli are useful in various field of applications especially to colorimetric sensors. However, there have been several limitations in generic application because of its cost, stability and reliability. Here, we introduced highly functionalizable polymeric materials as a supporter covalently modified with controlled amount of chromic dyes. The photochromic organic dye (spiropyran) and highly functional thermoplastic polyurethanes (TPU) have been adopted as a representative example. Conventional polymeric solution processes such as film processing, wet-spinning, electrospinning and ink-writing are readily applicable because dye-TPU maintains its own solubility in various organic solvents. Additionally, since the concentration of dye on TPU are precisely controllable, these dye-TPU solution can be adopted in broad range of specific applications, such as secret coding, smart fabric, and chromic polymeric film layer.
Highlights
Of issues for final applications, development of proper supporters carrying chromic dyes will be the most important because the chromic dyes which are organic molecules are difficult to be utilized in practical applications by just themselves[14]
We report on synthesis of highly functional thermoplastic polyurethanes (TPU) having bunch of azide functional groups in side chain which can be covalently anchored by organic dyes with desired/tailored concentration and shows minimized changes in solvent properties after modification
Adopting the several chain extenders such as 1,1ʹ-methanediylbis(4-isocyanatobenzene) (MDI) and butane-1,4-diol (BDO), azido TPU can be synthesized with controllable molecular weight range from 30,000 to 100,000
Summary
Of issues for final applications, development of proper supporters carrying chromic dyes will be the most important because the chromic dyes which are organic molecules are difficult to be utilized in practical applications by just themselves[14]. Chromic dyes have been introduced into polymeric supporters by usually surface treatment or simple blending that obviously contains several issues in terms of their stability, controlling of concentration, and durability[23,24]. It will be great if one can provide polymeric materials carrying tailored amount of chromic dyes via covalent bond with maintaining their processibility. Photochromic dyes (Spiropyran type) have been selected as a representative example This organic dye can be covalently anchored on pendant azide of TPU via click chemistry with controlled concentration. These versatile platforms can be expanded to prepare polymer-based chromic applications such as smart windows, smart fabric, optical sensor patch for early notice against environmental changes, and security inks
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