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

被引：29
|
作者：
Missio, Andre L. [1 ]
Mattos, Bruno D. [2 ]
de Cademartori, Pedro H. G. [3 ]
Pertuzzatti, Anderson [1 ]
Conte, Bruno [1 ]
Gatto, Darci A. [1 ,4 ]
机构：
[1] Univ Fed Santa Maria, Ctr Rural Sci, Forest Prod Lab, Forestry Engn PPGEF, BR-97105900 Santa Maria, RS, Brazil
[2] Univ Fed Parana, Polytech Ctr, Integrate Grad Program Engn & Mat Sci PIPE, BR-81531990 Curitiba, Parana, Brazil
[3] Univ Fed Parana, Wood & Forestry Sci Ctr PPGEF, BR-80210170 Curitiba, Parana, Brazil
[4] Univ Fed Pelotas, Fac Mat Engn PPGCEM, BR-9601000 Pelotas, Brazil
来源：
THERMOCHIMICA ACTA | 2015年 / 615卷
关键词：
Thermochemical changes; Hygroscopicity; Wettability; Wood freezing; Wood technology; DIMENSIONAL STABILITY; CHEMICAL-ANALYSIS; FT-IR; LIGNIN; SHRINKAGE; CELLULOSE;
D O I：
10.1016/j.tca.2015.07.005
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
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 degrees C (WFT180 and WFT200) and heat treatment at 180 and 200 degrees C (WT180 and WT200). The freeze step was performed at -22 degrees C for 72 h and the heat step was performed at 180-200 degrees 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. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：15 / 22
页数：8
相关论文
共 50 条
  • [1] Physical and mechanical properties and colour changes of fast-growing Gympie messmate wood subjected to two-step steam-heat treatments
    De Cademartori, Pedro Henrique G.
    Missio, Andre L.
    Mattos, Bruno D.
    Schneid, Eduardo
    Gatto, Darci A.
    WOOD MATERIAL SCIENCE & ENGINEERING, 2014, 9 (01) : 40 - 48
  • [2] Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments
    Missio, Andre L.
    de Cademartori, Pedro H. G.
    Mottos, Bruno D.
    Santini, Elio J.
    Haselein, Clovis R.
    Gatto, Darci A.
    BIORESOURCES, 2016, 11 (04): : 10378 - 10390
  • [3] Colour Responses of Two Fast-growing Hardwoods to Two-step Steam-heat Treatments
    de Cademartori, Pedro Henrique G.
    Mattos, Bruno D.
    Missio, Andre L.
    Gatto, Darci A.
    MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, 2014, 17 (02): : 487 - 493
  • [4] Decay resistance of two-step freezing–heat-treated fast-growing eucalyptus wood
    Rafael de Avila Delucis
    Sabrina Finatto Machado
    André Luiz Missio
    Darci Alberto Gatto
    Journal of the Indian Academy of Wood Science, 2019, 16 : 139 - 143
  • [5] Decay resistance of two-step freezing-heat-treated fast-growing eucalyptus wood
    Delucis, Rafael de Avila
    Machado, Sabrina Finatto
    Missio, Andre Luiz
    Gatto, Darci Alberto
    JOURNAL OF THE INDIAN ACADEMY OF WOOD SCIENCE, 2019, 16 (02) : 139 - 143
  • [6] Fast-growing pine wood modified by a two-step treatment based on heating and in situ polymerization of polystyrene
    Acosta, Andrey Pereira
    Delucis, Rafael de Avila
    Amico, Sandro Campos
    Gatto, Darci Alberto
    CONSTRUCTION AND BUILDING MATERIALS, 2021, 302
  • [7] Pathways of phase transformation in β-phase-stabilized σ/γ-TiAl alloys subjected to two-step heat treatments
    Klein, Thomas
    Holec, David
    Clemens, Helmut
    Mayer, Svea
    SCRIPTA MATERIALIA, 2018, 149 : 70 - 74
  • [8] Antimicrobial Properties of Polyimide Film Obtained by Two-Step Treatments
    Aflori, Magdalena
    Maria, Butnaru
    Doroftei, Florica
    Drobota, Mioara
    Barbalata-Mandru, Mihaela
    Maria, Spiridon
    Stelian, Vlad
    Gradinaru, Luiza Madalina
    Ursache, Stefan
    2021 INTERNATIONAL CONFERENCE ON E-HEALTH AND BIOENGINEERING (EHB 2021), 9TH EDITION, 2021,
  • [9] Physical properties of paper depending on two-step refining
    Jang, Hyun-Sung
    Park, Jong-Moon
    Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry, 2004, 36 (02): : 1 - 9
  • [10] Binding of aldehydes to myofibrillar proteins as affected by two-step heat treatments
    Xu, Yongxia
    Wang, Rui
    Zhao, Honglei
    Zhao, Jiamei
    Li, Xuepeng
    Yi, Shumin
    Li, Jianrong
    Sun, Xiaotao
    JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, 2020, 100 (03) : 1195 - 1203
12345