Grafting of polypyrrole-3-carboxylic acid to the surface of hexamethylene diisocyanate-functionalized graphene oxide
Identificadores
Enlace permanente (URI): http://hdl.handle.net/10017/49658DOI: 10.3390/nano9081095
ISSN: 2079-4991
Fecha de publicación
2019-07-31Filiación
Universidad de Alcalá. Departamento de Química Analítica, Química Física e Ingeniería QuímicaPatrocinadores
Ministerio de Economia y Competitividad
Cita bibliográfica
Nanomaterials, 2019, v. 9, n. 8, p. 1095-1115
Palabras clave
Polypyrrole
graphene oxide
hexamethylene diisocyanate
grafting reaction
morphology
thermal properties
tensile tests
Proyectos
info:eu-repo/grantAgreement/MINECO//RYC-2012-11110/ES/RYC-2012-11110/
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Derechos
Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
A polypyrrole-carboxylic acid derivative (PPy-COOH) was covalently anchored on the surface of hexamethylene diisocyanate (HDI)-modified graphene oxide (GO) following two different esterification approaches: activation of the carboxylic acids of the polymer by carbodiimide, and conversion of the carboxylic groups to acyl chloride. Microscopic observations revealed a decrease in HDI-GO layer thickness for the sample prepared via the first strategy, and the heterogeneous nature of the grafted samples. Infrared and Raman spectroscopies corroborated the grafting success, demonstrating the emergence of a peak associated with the ester group. The yield of the grafting reactions (31% and 42%) was roughly calculated from thermogravimetric analysis, and it was higher for the sample synthesized via formation of the acyl chloride-functionalized PPy. The grafted samples showed higher thermal stability (similar to 30 and 40 degrees C in the second decomposition stage) and sheet resistance than PPy-COOH. They also exhibited superior stiffness and strength both at 25 and 100 degrees C, and the reinforcing efficiency was approximately maintained at high temperatures. Improved mechanical performance was attained for the sample with higher grafting yield. The developed method is a valuable approach to covalently attach conductive polymers onto graphenic nanomaterials for application in flexible electronics, fuel cells, solar cells, and supercapacitors.
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