Reactivity, characterization and mechanical performance of particleboards bonded with tannin resins and bio hardeners from African trees

IF 1.3 Q2 MATERIALS SCIENCE, PAPER & WOOD
B. Ndiwe, B. Tibi, R. Danwe, N. Konai, A. Pizzi, S. Amirou
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引用次数: 6

Abstract

ABSTRACT Gilbertiodendron dewevrei tannin extract was characterized using MALDI–ToF and CP MAS 13C NMR methods. These two characterization methods have proven that catechin gallate is the dominant constituent. Subsequently, the G. dewevrei tannin bio-resins hardened with the exudates of Vachellia nilotica, Vachellia seyal, Senegalia senegal, Acacia siebteriana and the fruit powder of V. nilotica from the extreme north of Cameroon were studied using gel time analysis and thermomechanical analysis. Analysis indicated that the cross-linking species in these hardeners was 2,5-dihydroxymethyl furan linked to carbohydrate chains. The extracts obtained in comparison to paraformaldehyde cured adhesives in equal proportions (10%) show that the ‘biohardener’ had properties for adhesive and eco-friendly applications. The internal bond (IB) strength of G. dewevrei resin-bonded panels using biohardeners ranged from 0.46 MPa to 0.61 MPa, the MOE and MOR values were from 1880.23 to 2226,52 MPa and 14,17 to 16,41 MPa. All particleboards prepared presented exterior grade capabilities.
非洲树木单宁树脂和生物硬化剂粘合刨花板的反应性、特性和力学性能
摘要/ ABSTRACT摘要:采用MALDI-ToF和CP MAS 13C NMR对金牛子栲胶进行了表征。这两种表征方法证明儿茶素没食子酸酯是主要成分。随后,利用凝胶时间分析和热力学分析研究了用产自喀麦隆极北地区的尼罗花、西叶花、塞内加尔花、西相思和尼罗花果粉等植物的分泌物硬化的G. dewevrei单宁生物树脂。分析表明,这些固化剂中的交联物质是与碳水化合物链连接的2,5-二羟甲基呋喃。与同等比例(10%)的多聚甲醛固化粘合剂相比,所获得的提取物表明,“生物硬化剂”具有粘合剂和环保应用的特性。使用生物硬化剂的松脂板的内键强度(IB)为0.46 ~ 0.61 MPa, MOE和MOR分别为1880.23 ~ 2226,52 MPa和14,17 ~ 16,41 MPa。所有准备好的刨花板都具有外部等级的性能。
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来源期刊
International Wood Products Journal
International Wood Products Journal MATERIALS SCIENCE, PAPER & WOOD-
CiteScore
2.40
自引率
0.00%
发文量
27
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