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Polypropylene/chemically treated coir composites: optimizing coir delignification conditions using central composite design

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Tipo de produção

Artigo

Data de publicação

2018

Texto completo (DOI)

Periódico

Cellulose

Editor

Citações na Scopus

4

Autores

de Araujo Morandim-Giannetti A.
Pasquoto C.G.
Sombra T.M.
Bonse B.C.
Bettini S.H.P.

Orientadores

Resumo

© 2017, Springer Science+Business Media B.V., part of Springer Nature.The effect of alkaline treatment of coir on polypropylene/coir composite properties was investigated, using a two-factor central composite design where NaOH concentration and reaction time were varied. Alkaline treatment favored delignification, and at certain conditions, increased composite stiffness without loss in tensile strength. Increase in cellulose concentration likely increases the number of free hydroxyls, which is less favorable to composite mechanical properties. Treatments with 2 and 9% NaOH for 5 h resulted in cellulose concentration of about 50 and 70%, respectively. Treatments with high concentrations and for long periods are disadvantageous to composite properties, resulting in lower tensile strength likely due to the increased number of free hydroxyls as well as to possible breaks in cellulose structure. A desirability function, used to optimize the delignification process, revealed the highest tensile modulus and strength (3.5 GPa and 31 MPa, respectively) could be obtained at 5.75% NaOH and reaction time of 3 h.

Citação

DE ARAÚJO MORANDIM-GIANNETTI, ANDREIA; PASQUOTO, CAIO GODOY; SOMBRA, THAIS MATOSO; BONSE, BALTUS CORNELIUS; BETTINI, SÍLVIA HELENA PRADO. Polypropylene/chemically treated coir composites: optimizing coir delignification conditions using central composite design. Cellulose, v. 25, p. 1159-1170, 2017.

Palavras-chave

Keywords

Alkaline treatment; Composite properties; Polypropylene/coir composite; Two-factor central composite design

Assuntos Scopus

Alkaline treatment; Cellulose structures; Central composite designs; Composite properties; Composite stiffness; Desirability function; NaOH concentration; Two-factor central composite design

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