Abstract

The interfacial compatibility between wood and polymers of wood/plastic composite (WPC) has been widely investigated. However, the reported methods for improvement of interfacial compatibility almost utilized the compatibilizer. In this work, a compatibilizer-free method was applied to enhance the interfacial compatibility between wood flour (WF) and high-density polyethylene (HDPE). p-toluenesulfonic acid (p-TsOH) was used to selectively remove hemicelulose, which would significantly improve the hydrophobicity of WF. It was found that most hemicellulose (about 91%) and a small amount of lignin were solubilized from WF. The static water contact angle (WCA) of WF sheet was significantly increased from nearly 0° to 135.7°, indicating that the WF was converted from hydrophilic to hydrophobic. Scanning electron microscope (SEM) showed p-TsOH treatment of WF could effectively improve the interfacial bonding between the WF and HDPE. The composite with 50 wt% modified-WF (MWF) showed optimum mechanical properties with an increase of 33.5% and 38.7% in tensile strength and flexural strength, respectively, as compared to those of corresponding WF/HDPE composite.

中文翻译：

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源自新型p -TsOH处理的疏水性木粉，可改善木材/ HDPE复合材料的界面相容性

摘要

木材与木材/塑料复合材料（WPC）的聚合物之间的界面相容性已得到广泛研究。但是，所报道的改善界面相容性的方法几乎利用了相容剂。在这项工作中，采用了无增容剂的方法来增强木粉（WF）和高密度聚乙烯（HDPE）之间的界面相容性。p -甲苯磺酸（p-TsOH）用于选择性去除半纤维素，这将显着提高WF的疏水性。发现大多数半纤维素（约91％）和少量木质素从WF中溶解。WF片材的静态水接触角（WCA）从近0°显着增加到135.7°，表明WF从亲水性转变为疏水性。扫描电子显微镜（SEM）表明，对WF进行p -TsOH处理可以有效改善WF与HDPE之间的界面结合。与相应的WF / HDPE复合材料相比，具有50 wt％改性WF（MWF）的复合材料表现出最佳的机械性能，其抗张强度和弯曲强度分别提高了33.5％和38.7％。