title: Thermochemical properties of cellulose acetate blends with acetosolv and sawdust lignin: A comparative study.
abstract: Sawdust (SD) and cotton-lignin blends (CLB) were acetylated and the effect of lignin type and content on thermoplastic properties of the acetate produced was studied. The lignin in samples did not significantly affect the degree of acetylation. An increase in acetyl groups of 1-3% was observed in acetylated SD (ASD) unlike acetylated CLB (ACLB). Thermogravimetric analysis showed two thermal degradation zones; one at 190-200°C and the other at 330-370°C. The early degradation in ASD corresponds to galactoglucomannans while that in ACLB corresponds to the low-molecular-weight lignin. The second degradation is due to decomposition of cellulose acetate and high-molecular-weight lignin. DSC analysis showed homogeneous behaviour in ASD with only one glass transition temperature (Tg) at 170-180°C, unlike ACLB that showed two Tgs at 170-180°C. Sawdust acetylation, taking advantage of its residual lignin, showed higher reactivity and miscibility as compared to the same material produced by adding previously extracted lignin on cotton.
authors.affiliation: Department of Chemical Engineering, University of Concepción, Edificio Gustavo Pizarro Castro, 2do Piso, Barrio Universitario S/N, 4070386 Concepción, Chile. Electronic address: k.peredo@udt.cl.
authors.forename: Karol
authors.initials: K
authors.lastname: Peredo
authors.affiliation: Technological Development Unit, University of Concepción, Avenida Cordillera # 2634, Parque Industrial Coronel, 4191996 Coronel, Chile. Electronic address: d.escobar@udt.cl.
authors.forename: Danilo
authors.initials: D
authors.lastname: Escobar
authors.affiliation: Technological Development Unit, University of Concepción, Avenida Cordillera # 2634, Parque Industrial Coronel, 4191996 Coronel, Chile. Electronic address: j.vega@udt.cl.
authors.forename: Johana
authors.initials: J
authors.lastname: Vega-Lara
authors.affiliation: Technological Development Unit, University of Concepción, Avenida Cordillera # 2634, Parque Industrial Coronel, 4191996 Coronel, Chile. Electronic address: a.berg@udt.cl.
authors.forename: Alex
authors.initials: A
authors.lastname: Berg
authors.affiliation: Department of Chemical Engineering, University of Concepción, Edificio Gustavo Pizarro Castro, 2do Piso, Barrio Universitario S/N, 4070386 Concepción, Chile. Electronic address: miguelpereira@udec.cl.
authors.forename: Miguel
authors.initials: M
authors.lastname: Pereira
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D000107:Acetylation; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D004951:Esterification; D003368:Gossypium / Q000737:chemistry; D008031:Lignin / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013696:Temperature; D014934:Wood / Q000737:chemistry*
chemical_list: D012997:Solvents; C036909:lignocellulose; C005062:acetylcellulose; D002482:Cellulose; D008031:Lignin; D019342:Acetic Acid
keywords: Cellulose acetate; Degree of substitution; Lignin