Tensile stress relaxation of wood impregnated with different ACQ formulations at various temperatures
Tensile stress relaxation of wood impregnated with different ACQ formulations at various temperatures
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不同温度下用不同 ACQ 配方浸渍的木材的拉伸应力松弛
DOI：
10.1515/hf.2010.012
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发表时间：
2009
期刊：
影响因子：
2.4
通讯作者：
Yu, Lili
中科院分区：
文献类型：
--
作者：
Zhao, Guangjie;Cao, Jinzhen;Yu, Lili
摘要用拉伸应力松弛法研究了碱性铜季铵盐（ACQ）与木材组分之间的反应。小样本强调和浸渍与各种ACQ解决方案，其中单乙醇胺（MEA），ACQ，和二癸基二甲基氯化铵（DDAC）的比例是不同的。其他参数包括处理液的温度和浓度。采用正交试验设计，研究了木材在浸渍过程中的应力松弛曲线，并对浸渍工艺参数的影响进行了分析。水，MEA，和DDAC对样品的应力松弛的影响进行了观察。在用蒸馏水处理而不拉伸的样品中分别测试水的膨胀效应。结果表明，应力在初始阶段急剧松弛，然后在很长一段时间内略有变化，这在f（t）/f（0）对时间（t）的双对数图中很容易看出。ACQ溶液的组分与木材基质之间存在复杂的相互作用：（1）在快速阶段I，容易接近的氢键（主要在无定形半纤维素中）的分裂通过与ACQ溶液组分的相互作用而普遍存在;（2）在缓慢阶段II，Cu在不易接近的区域（例如，在纤维素的次晶区域中），并使得可能进一步松弛。极差和方差分析的结果表明，铜的摩尔比MEA和ACQ溶液的温度有显着的影响，在第一阶段的反应速率，而在第二阶段只有ACQ溶液的温度有显着的影响。浸渍在水中，MEA，和DDAC的样品的应力松弛曲线都表现出准一个阶段的应力松弛速率，这表明第二阶段主要是与铜ACQ配方。结果表明，虽然ACQ各组分之间存在竞争，但与Cu形成络合物仍是木材中的主要反应。
Abstract The reactions between constituents of alkaline copper quat (ACQ) and of wood were investigated by a tensile stress relaxation approach. Small samples were stressed and impregnated with various ACQ solutions, in which the ratios of monoethanolamine (MEA), ACQ, and didecyl dimethyl ammonium chloride (DDAC) were varied. The other parameters included temperature and concentration of the treating solutions. The stress relaxation curves of wood were recorded during the impregnation period and the effects of impregnation parameters were investigated by an orthogonal experimental design (OED). The effects of water, MEA, and DDAC on stress relaxation of the samples were also observed. The bulking effect of water was tested separately in samples treated with distilled water without stretching. The results showed that the stress relaxes dramatically in the initial period and then changes slightly over a long period, which is readily visible in double logarithmic plots of f (t)/f (0) versus time (t). There are complex interactions between the components of ACQ solutions and wood matrix: (1) in rapid phase I, the splitting of the easily accessible hydrogen bonds (mainly in the amorphous hemicelluloses) are prevalent by interaction with components of ACQ solution; (2) in slow phase II, Cu penetrates deeper in less accessible regions (e.g., in paracrystalline regions of cellulose) and renders possible further relaxation. The results of range and variance analysis reveal that the molar ratio of Cu to MEA and temperature of ACQ solution have significant effects on the rate of reaction during phase I, whereas in phase II only the temperature of ACQ solution has a significant effect. The stress relaxation curves of samples impregnated in water, MEA, and DDAC all showed a quasi one phase stress relaxation rate, which suggests that phase II is mostly related to Cu in ACQ formulations. It is concluded that the formation of complexes with Cu is still the major reaction in wood although there is competition among ACQ constituents for reaction sites.
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影响因子：
1.4
作者：
P. Cooper
通讯作者：
P. Cooper
DOI：
10.1515/hf.2001.003
发表时间：
2001-12
期刊：
--
影响因子：
--
作者：
N. Druz;I. Andersone;B. Andersons
通讯作者：
N. Druz;I. Andersone;B. Andersons
DOI：
10.1515/hf.2008.035
发表时间：
2008
期刊：
--
影响因子：
--
作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
通讯作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
DOI：
10.1515/hf.2005.094
发表时间：
2005-09
期刊：
--
影响因子：
--
作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
通讯作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
影响因子：
2.4
作者：
N. Druz;I. Andersone;B. Andersons
通讯作者：
N. Druz;I. Andersone;B. Andersons