resumo
Rigid polyurethane foams (RPUF) are mainly used as thermal insulators materials. These materials are drawing the attention of the emerging sector of the Internet of Things (IoT) due to their features such as good chemical resistance, lightweight, and tunable mechanical properties. Yet, for IoT applications, the electrical conductivity of this type of materials should be increased substantially. To address this challenge, as well as the urgency to use renewable and sustainable resources, semi-conductive RPUF were synthesized using crude lignin-based polyol (LBP) doped with multi-walled carbon nanotubes (MWCNT) and coated with PEDOT: PSS, using the dip coating technique. The ensuing semi-conductive RPUF has low density (33-34 kg/m(3)), high electrical conductivity (in the order of magnitude of 10(- 5 )S/m), and a stretchability enhancement of almost 50 % upon coating with PEDOT: PSS. Furthermore, the mechanical performance of RPUFs can be adjusted using MWCNT and fine tuning of the formulation. Lignin being an abundant natural aromatic polyol allows the partial replacement of fossil derived polyols in the production of RPUFs and its aromatic structure contributes to the thermal and mechanical stability of the ensuing foams.
palavras-chave
MECHANICAL STRETCHABILITY; BEHAVIOR; ENHANCEMENT; SENSORS; FILMS
categoria
Science & Technology - Other Topics; Materials Science
autores
Vieira, FR; Teixeira, SS; Alikin, D; Costa, LC; Gama, N; Barros-Timmons, A; Kholkin, A; Evtuguin, DV; Pinto, PCR
nossos autores
Ana Margarida Madeira Viegas de Barros Timmons
Professor associado
Andrei Kholkin
Investigador Jubilado
Denis Alikin
Investigador Auxiliar
Dmitry Evtyugin
Professor Associado com Agregação
Fernanda Vieira
Colaborador
Nuno Vasco da Costa Gama Batista de Melo
Investigador JúniorGrupos
G1 - Materiais Porosos e Nanossistemas
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was carried out under the Project Inpactus-innovative products and technologies from eucalyptus, Project N.o 21874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 no 246/AXIS II/2017 and developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MCTES (PIDDAC) .