Thermochemical and physical properties of two fast-growing eucalypt woods subjected to two-step freeze-heat treatments

André L. Missio; Bruno D. Mattos; Pedro H.G. De Cademartori; Anderson Pertuzzatti; Bruno Conte; Darci A. Gatto

doi:10.1016/j.tca.2015.07.005

Thermochemical and physical properties of two fast-growing eucalypt woods subjected to two-step freeze-heat treatments

André L. Missio
, Bruno D. Mattos
, Pedro H.G. De Cademartori
, Anderson Pertuzzatti
, Bruno Conte
, Darci A. Gatto^*

^*Corresponding author for this work

Not published at Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

33 Citations (Scopus)

Abstract

Abstract In this study, the effect of two-step freeze-heat treatments on the thermochemical and physical properties of two Eucalyptus wood were investigated. Five treatments were performed and compared to untreated control: freezing (WF), freezing followed by heat treatment at 180 and 200°C (WFT180 and WFT200) and heat treatment at 180 and 200°C (WT180 and WT200). The freeze step was performed at -22°C for 72 h and the heat step was performed at 180-200°C for 3.5 h. Thermochemical (wet chemical analysis, FTIR and TGA), physical (water absorption and ASE) and surface properties (wettability) were measured. The two-step freeze-heat treatments changed the holocellulose and extractives contents, and stabilized the 1% NaOH solubility. Dimensional stability increased and hygroscopicity of thermally treated eucalypt wood decreased. The two-step treatments resulted in lower chemical changes than the application of a heat treatment only. The apparent contact angle of thermally treated wood increased, confirming the improvement of wood hydrophobicity.

Original language	English
Article number	77286
Pages (from-to)	15-22
Number of pages	8
Journal	Thermochimica Acta
Volume	615
DOIs	https://doi.org/10.1016/j.tca.2015.07.005
Publication status	Published - 24 Jul 2015
MoE publication type	A1 Journal article-refereed

Funding

The authors wish to thank the Federal Agency for Support and Evaluation of Graduate Education (CAPES), the National Council for Scientific and Technological Development (CNPq) and Araucária Foundation for supporting this work. We would like to thank Bia Carneiro, MSc and native English speaker, for the professional revision of the manuscript.

Keywords

Hygroscopicity
Thermochemical changes
Wettability
Wood freezing
Wood technology

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10.1016/j.tca.2015.07.005

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@article{0f96895ce3a9474ca5f3eae71874aaff,

title = "Thermochemical and physical properties of two fast-growing eucalypt woods subjected to two-step freeze-heat treatments",

abstract = "Abstract In this study, the effect of two-step freeze-heat treatments on the thermochemical and physical properties of two Eucalyptus wood were investigated. Five treatments were performed and compared to untreated control: freezing (WF), freezing followed by heat treatment at 180 and 200°C (WFT180 and WFT200) and heat treatment at 180 and 200°C (WT180 and WT200). The freeze step was performed at -22°C for 72 h and the heat step was performed at 180-200°C for 3.5 h. Thermochemical (wet chemical analysis, FTIR and TGA), physical (water absorption and ASE) and surface properties (wettability) were measured. The two-step freeze-heat treatments changed the holocellulose and extractives contents, and stabilized the 1\% NaOH solubility. Dimensional stability increased and hygroscopicity of thermally treated eucalypt wood decreased. The two-step treatments resulted in lower chemical changes than the application of a heat treatment only. The apparent contact angle of thermally treated wood increased, confirming the improvement of wood hydrophobicity.",

keywords = "Hygroscopicity, Thermochemical changes, Wettability, Wood freezing, Wood technology",

author = "Missio, \{Andr{\'e} L.\} and Mattos, \{Bruno D.\} and \{De Cademartori\}, \{Pedro H.G.\} and Anderson Pertuzzatti and Bruno Conte and Gatto, \{Darci A.\}",

note = "Funding Information: The authors wish to thank the Federal Agency for Support and Evaluation of Graduate Education (CAPES), the National Council for Scientific and Technological Development (CNPq) and Arauc{\'a}ria Foundation for supporting this work. We would like to thank Bia Carneiro, MSc and native English speaker, for the professional revision of the manuscript. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = jul,

day = "24",

doi = "10.1016/j.tca.2015.07.005",

language = "English",

volume = "615",

pages = "15--22",

journal = "Thermochimica Acta",

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TY - JOUR

T1 - Thermochemical and physical properties of two fast-growing eucalypt woods subjected to two-step freeze-heat treatments

AU - Missio, André L.

AU - Mattos, Bruno D.

AU - De Cademartori, Pedro H.G.

AU - Pertuzzatti, Anderson

AU - Conte, Bruno

AU - Gatto, Darci A.

N1 - Funding Information: The authors wish to thank the Federal Agency for Support and Evaluation of Graduate Education (CAPES), the National Council for Scientific and Technological Development (CNPq) and Araucária Foundation for supporting this work. We would like to thank Bia Carneiro, MSc and native English speaker, for the professional revision of the manuscript. Publisher Copyright: © 2015 Elsevier B.V.

PY - 2015/7/24

Y1 - 2015/7/24

N2 - Abstract In this study, the effect of two-step freeze-heat treatments on the thermochemical and physical properties of two Eucalyptus wood were investigated. Five treatments were performed and compared to untreated control: freezing (WF), freezing followed by heat treatment at 180 and 200°C (WFT180 and WFT200) and heat treatment at 180 and 200°C (WT180 and WT200). The freeze step was performed at -22°C for 72 h and the heat step was performed at 180-200°C for 3.5 h. Thermochemical (wet chemical analysis, FTIR and TGA), physical (water absorption and ASE) and surface properties (wettability) were measured. The two-step freeze-heat treatments changed the holocellulose and extractives contents, and stabilized the 1% NaOH solubility. Dimensional stability increased and hygroscopicity of thermally treated eucalypt wood decreased. The two-step treatments resulted in lower chemical changes than the application of a heat treatment only. The apparent contact angle of thermally treated wood increased, confirming the improvement of wood hydrophobicity.

AB - Abstract In this study, the effect of two-step freeze-heat treatments on the thermochemical and physical properties of two Eucalyptus wood were investigated. Five treatments were performed and compared to untreated control: freezing (WF), freezing followed by heat treatment at 180 and 200°C (WFT180 and WFT200) and heat treatment at 180 and 200°C (WT180 and WT200). The freeze step was performed at -22°C for 72 h and the heat step was performed at 180-200°C for 3.5 h. Thermochemical (wet chemical analysis, FTIR and TGA), physical (water absorption and ASE) and surface properties (wettability) were measured. The two-step freeze-heat treatments changed the holocellulose and extractives contents, and stabilized the 1% NaOH solubility. Dimensional stability increased and hygroscopicity of thermally treated eucalypt wood decreased. The two-step treatments resulted in lower chemical changes than the application of a heat treatment only. The apparent contact angle of thermally treated wood increased, confirming the improvement of wood hydrophobicity.

KW - Hygroscopicity

KW - Thermochemical changes

KW - Wettability

KW - Wood freezing

KW - Wood technology

UR - https://www.scopus.com/pages/publications/84937900219

U2 - 10.1016/j.tca.2015.07.005

DO - 10.1016/j.tca.2015.07.005

M3 - Article

AN - SCOPUS:84937900219

SN - 0040-6031

VL - 615

SP - 15

EP - 22

JO - Thermochimica Acta

JF - Thermochimica Acta

M1 - 77286

ER -

Thermochemical and physical properties of two fast-growing eucalypt woods subjected to two-step freeze-heat treatments

Abstract

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Keywords

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