Polypropylene/chemically treated coir composites: optimizing coir delignification conditions using central composite design
N/D
Tipo de produção
Artigo
Data de publicação
2018
Texto completo (DOI)
Periódico
Cellulose
Editor
Texto completo na Scopus
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