Conductive Nanocomposites Based on Cellulose Nanofibrils Coated with Polyaniline-DBSA Via In Situ Polymerization |
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| Authors: | Michael J Silva Alex O Sanches Luiz F Malmonge Eliton S Medeiros Morsyleide F Rosa Colleen M McMahan José A Malmonge |
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| Institution: | 1. UNESP – Univ. Estadual Paulista, Faculdade de Engenharia, Campus de Ilha Solteira, Departamento de Física e Química, São Paulo – Brazil;2. Departamento de Engenharia de Materiais, Universidade Federal da Paraíba, João Pessoa – Pb, Brazil;3. Embrapa Agroindústria Tropical, Fortaleza, CE, Brazil;4. Western Regional Research Center, USDA-ARS, Albany, California 94710 |
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| Abstract: | Summary: 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. |
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| Keywords: | cellulose nanofibrils nanocomposite polyaniline |
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