Autor(es):
Silva, Michael J. [UNESP] ; Sanches, Alex O. [UNESP] ; Malmonge, Luiz F. [UNESP] ; Medeiros, Eliton S. ; Rosa, Morsyleide F. ; McMahan, Colleen M. ; Malmonge, José A. [UNESP]
Data: 2014
Identificador Persistente: http://hdl.handle.net/11449/73524
Origem: Oasisbr
Assunto(s): cellulose nanofibrils; nanocomposite; polyaniline; Acid hydrolysis; Cellulose nanofibrils; Characteristic peaks; Crystalline peaks; DC electrical conductivity; Electrical conductivity; Field emission scanning electron microscopy; Four-probe; FTIR; In-situ; In-situ polymerization; Micro-fibrils; Molar ratio; Nano-fibrils; X-ray patterns; Aniline; Cellulose; Electric conductivity; Field emission microscopes; Fourier transform infrared spectroscopy; Infrared devices; Polyaniline; Polymerization; X ray diffraction; Nanocomposites
Descrição
Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:26:57Z No. of bitstreams: 0
Made available in DSpace on 2014-05-27T11:26:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-09-01
Cellulose nanofibrils (CNF) were extracted by acid hydrolysis from cotton microfibrils and nanocomposites with polyaniline doped with dodecyl benzenesulphonic acid (PANI-DBSA) were obtained by in situ polymerization of aniline onto CNF. The ratios between DBSA to aniline and aniline to oxidant were varied in situ and the nanocomposites characterized by four probe DC electrical conductivity, ultraviolet-visible-near infrared (UV-Vis - NIR) and Fourier-transform infrared (FTIR) spectroscopies and X-ray diffraction (XRD). FTIR and UV-Vis/NIR characterization confirmed the polymerization of PANI onto CNF surfaces. Electrical conductivity of about 10 -1 S/cm was achieved for the composites; conductivity was mostly independent of DBSA/aniline (between 2 and 4) and aniline/oxidant (between 1 and 5) molar ratios. X-ray patterns of the samples showed crystalline peaks characteristic of cellulose I for CNF samples, and a mixture of both characteristic peaks of PANI and CNF for the nanocomposites. Field emission scanning electron microscopy (FESEM) characterization corroborated the abovementioned results showing that PANI coated the surface of the nanofibrils. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
UNESP - Univ. Estadual Paulista Faculdade de Engenharia Departamento de Física e Química, São Paulo
Departamento de Engenharia de Materiais Universidade Federal da Paraíba, João Pessoa - Pb
Embrapa Agroindústria Tropical, Fortaleza, CE
Western Regional Research Center USDA-ARS, Albany, CA 94710
UNESP - Univ. Estadual Paulista Faculdade de Engenharia Departamento de Física e Química, São Paulo
