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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Melt-mixed nanocomposites of SIS/MWCNT: rheological, electrical and structural behavior

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Author(s):
Ludimilla Barbosa Ferreira [1] ; Rayane de Souza Fernandes [2] ; Rosario Elida Suman Bretas [3] ; João Paulo Ferreira Santos [4]
Total Authors: 4
Affiliation:
[1] Centro Federal de Educação Tecnológica de Minas Gerais. Departamento de Engenharia de Materiais - Brasil
[2] Centro Federal de Educação Tecnológica de Minas Gerais. Departamento de Engenharia de Materiais - Brasil
[3] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais - Brasil
[4] Centro Federal de Educação Tecnológica de Minas Gerais. Departamento de Engenharia de Materiais - Brasil
Total Affiliations: 4
Document type: Journal article
Source: POLIMEROS-CIENCIA E TECNOLOGIA; v. 30, n. 4 2021-03-12.
Abstract

Abstract In this work, nanocomposites based on the triblock copolymer polystyrene-b-polyisoprene-b-polystyrene (SIS) thermoplastic elastomer filled with multiwall carbon nanotubes (MWCNT) were obtained by melt mixing. The nanocomposites were characterized by oscillatory rheometry, electrical resistivity, small angle x-ray scattering (SAXS) and transmission electron microscopy (TEM). The results showed that both, rheological and electrical percolation were achieved at MWCNT loadings between 1-3 vol.%. Rheological tests revealed that the insertion of MWCNT into SIS significantly enhanced the process of relaxation of SIS blocks. Resistivity measurements revealed that conductive nanocomposites were obtained at MWCNT loadings ~1.6 vol.%. The electrical resistivity decreased eleven orders of magnitude from neat SIS to SIS/ 5 vol.% MWCNT. Finally, SAXS and TEM showed that the melt mixing process and the presence of MWCNT hampered the self-assembly of SIS into well-ordered domains. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/03118-2 - Visulization, Characterization and Manipulation of Ferroelectric and Magnetic Domains in Multiferroics
Grantee:André Marino Gonçalves
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 16/03667-4 - Electrospinning of ceramic nanofibers for polymeric nanocomposites
Grantee:Rosario Elida Suman Bretas
Support Opportunities: Scholarships abroad - Research
FAPESP's process: 14/17597-2 - Hybrid nanocomposites based on block copolymers for application in supercapacitors
Grantee:João Paulo Ferreira Santos
Support Opportunities: Scholarships in Brazil - Doctorate