Abstract Density of wood can be increased by filling its porous structure with polymers. Such densification processes aim to increase hardness of wood and are particularly interesting for flooring applications. This study aims to evaluate efficiency of different polymers for chemical densification based on the polymer properties. Yellow birch (Betula alleghaniensis Britt.) was chemically densified with seven monomer mixtures through acrylate monomer impregnation and electron beam in-situ polymerization. Chemical retention and polymer content of densified woods were recorded. Hardness of treated and untreated Yellow birch was measured and compared to hardness of Jatoba (Hymenaea courbaril L.). All densified woods showed higher or comparable hardness to Jatoba. Hardness of densified wood was analyzed in relation to initial density of wood and polymer content of the material using multivariable linear mixed models. Efficiency of polymers for chemical densification was evaluated through effect of polymer content on hardness with interaction coefficients. Polymer films corresponding to monomer impregnating mixtures were prepared through low energy electron beam and characterized by their glass transition temperature, micro hardness, indentation modulus and crosslinking density. Polymers showed statistically significantly different efficiencies and were separated in two main groups. Overall, polymer efficiency increased with increasing glass transition temperature of polyacrylates.

中文翻译：

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化学致密黄桦的硬度与木材密度、聚合物含量和聚合物特性有关

摘要 木材的密度可以通过用聚合物填充其多孔结构来增加。这种致密化工艺旨在提高木材的硬度，尤其适用于地板应用。本研究旨在根据聚合物特性评估不同聚合物的化学致密化效率。通过丙烯酸酯单体浸渍和电子束原位聚合，黄桦 (Betula alleghaniensis Britt.) 用七种单体混合物进行化学致密化。记录了致密木材的化学保留和聚合物含量。测量处理和未处理的黄桦的硬度，并与 Jatoba (Hymenaea courbaril L.) 的硬度进行比较。所有致密木材都显示出与 Jatoba 更高或相当的硬度。使用多变量线性混合模型分析与木材的初始密度和材料的聚合物含量相关的致密木材的硬度。通过聚合物含量对硬度和相互作用系数的影响来评估聚合物的化学致密化效率。通过低能电子束制备对应于单体浸渍混合物的聚合物薄膜，并对其玻璃化转变温度、显微硬度、压痕模量和交联密度进行表征。聚合物显示出统计学上显着不同的效率，并分为两个主要组。总体而言，聚合物效率随着聚丙烯酸酯玻璃化转变温度的增加而增加。通过聚合物含量对硬度和相互作用系数的影响来评估聚合物的化学致密化效率。通过低能电子束制备对应于单体浸渍混合物的聚合物薄膜，并对其玻璃化转变温度、显微硬度、压痕模量和交联密度进行表征。聚合物显示出统计学上显着不同的效率，并分为两个主要组。总体而言，聚合物效率随着聚丙烯酸酯玻璃化转变温度的增加而增加。通过聚合物含量对硬度和相互作用系数的影响来评估聚合物的化学致密化效率。通过低能电子束制备对应于单体浸渍混合物的聚合物薄膜，并对其玻璃化转变温度、显微硬度、压痕模量和交联密度进行表征。聚合物显示出统计学上显着不同的效率，并分为两个主要组。总体而言，聚合物效率随着聚丙烯酸酯玻璃化转变温度的升高而增加。压痕模量和交联密度。聚合物显示出统计学上显着不同的效率，并分为两个主要组。总体而言，聚合物效率随着聚丙烯酸酯玻璃化转变温度的增加而增加。压痕模量和交联密度。聚合物显示出统计学上显着不同的效率，并分为两个主要组。总体而言，聚合物效率随着聚丙烯酸酯玻璃化转变温度的增加而增加。