RT info:eu-repo/semantics/article
T1 Grafting of polypyrrole-3-carboxylic acid to the surface of hexamethylene diisocyanate-functionalized graphene oxide
A1 Luceño Sánchez, José Antonio
A1 Díez Pascual, Ana María
K1 Polypyrrole
K1 graphene oxide
K1 hexamethylene diisocyanate
K1 grafting reaction
K1 morphology
K1 thermal properties
K1 tensile tests
K1 Química
K1 Chemistry
AB 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.
SN 2079-4991
YR 2019
FD 2019-07-31
LK http://hdl.handle.net/10017/49658
UL http://hdl.handle.net/10017/49658
LA eng
NO Ministerio de Economia y Competitividad
DS MINDS@UW
RD 25-abr-2024