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Registros recuperados: 13 | |
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VICTOR, P. A.; GONCALVES, S. B.; MACHADO, F.. |
A modified sequential mass-suspension polymerization was employed to ensure adequate dispersion of lignin into the monomeric phase. Due to its complex macromolecular structure and low compatibility with styrene, eucalyptus wood-extracted lignin, via a modified Kraft method, was esterified with methacrylic anhydride to ensure organic phase homogeneity into the reaction medium. Infrared spectroscopy showed a decrease in the hydroxyl band, a characteristic of natural lignin (3200?3400 cm−1) and an increase in the characteristic ester band (1720?1740 cm−1) whereas nuclear magnetic resonance measurements exhibited intense peaks in the range from 1.7 to 2.05 ppm (?CH3) and 5.4 to 6.2 ppm (=CH2), related to methacrylic anhydride.... |
Tipo: Separatas |
Palavras-chave: Polymer composites; Polimerização sequencial; Compósitos poliméricos; Styrene; Lignin. |
Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107112 |
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Registros recuperados: 13 | |
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