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Photo-reversible polyurethane (PU) coatings based on coumarin diol (CD) are obtained. Initially, pre-polymers based on different amounts of coumarin (5, 15, and 25 mol%) and 1,6-hexamethylene diisocyanate are prepared to obtain PUs with a large incorporation of CD and high molecular weight. The pre-polymer is posterior reacted with poly(ε-caprolactone) diol (PCL-diol), either with molecular weight (Formula presented.) = 530 or 2000 g mol. The thermal stabilities of the PUs are studied using thermogravimetric analysis. Polymers with a higher content of CD present higher stability. The thermal transitions and the mechanical response are analyzed using differential scanning calorimetry and strain-stress tests, respectively. Moreover, the photo-reversibility of CD-based PUs is followed by UV absorption. In general, photo-dimerization induces better mechanical properties of the final PUs. Materials obtained with short PCL-diol ((Formula presented.) = 530 g mol) and the highest amount of CD present higher reversibility processes. Therefore, these polymers are promising for application as coating systems. (Figure presented.).

Pertenece a



Salgado, Cástor -  Arrieta, Marina P. -  Peponi, Laura -  Fernández -  García, Marta -  López, Daniel - 

Id.: 70077644

Idioma: eng  - 

Versión: 1.0

Estado: Final

Palabras clavePhotoreversible - 

Tipo de recurso: Artículo  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: closedAccess

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://dx.doi.org/10.1002/mame.201600515
[References] Sí

Fecha de contribución: 07-sep-2017


* doi: 10.1002/mame.201600515
* issn: 1438-7492
* e-issn: 1439-2054
* Macromolecular Materials and Engineering 302 (2017)

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