Some Properties of Composite Panels Manufactured from Eastern Redcedar (Juniperus virginiana L.) Using Modified Starch as a Green Binder

ABSTRACT

The objective of this study was to evaluate basic properties of particleboard panels manufactured from Eastern redcedar (Juniperus virginiana L.) using modified starch and low percent of urea formaldehyde as binder. Experimental panels in the form of three-layer configuration were made from the raw material at two density levels. Bending characteristics, namely, modulus of elasticity (MOE), modulus of rupture (MOR), and internal bond strength (IB) in addition to dimensional stability and surface roughness of the samples were determined. The highest MOE and MOR values of the samples with 0.80 g/cm³ density level were found as 2344.32 and 12.14 MPa, respectively. Both bending and IB values of the samples were comparable to those of commercially manufactured panels from other species. It appears that dimensional stability of the panels needs to be enhanced. Based on the findings in this work, modified starch could have potential as green binder in particleboard panels manufactured from Eastern redcedar without having substantial adverse influence on their properties.

摘要

本研究旨在评估使用改性淀粉和低含量脲醛作为粘合剂的东方红杉（维吉尼亚雪松L.）制造的刨花板的基本性质。实验用的三层构造刨花板以两种密度水平的原料制备。在研究中，不仅测定了样品的尺寸稳定性和表面粗糙度，还测定了弯曲特性，即弹性模量（MOE）、断裂模量（MOR）和内部结合强度（IB）。经测定，0.80 克/立方厘米密度水平样本的最高 MOE 和 MOR 值分别为 2344.32 和 12.14 兆帕。样品的弯曲特性值和IB值都与来自其他物种的商业制造的板材相当，而板材的尺寸稳定性需要增强。研究表明，改性淀粉用作绿色粘合剂在由东方红杉制造的刨花板中具有潜力，而对板材性质没有重大不利影响。

KEYWORDS:

• Eastern redcedar
• mechanical properties
• modified starch
• particleboard

关键词:

• 东方红杉
• 力学性质
• 改性淀粉
• 刨花板

Acknowledgment

Graduate scholarship to carry out this work granted to the principal author Aujchariya Chotikhun by the government budget of Prince of Songkla University, Thailand is greatly appreciated.