Burning rice straw particles is a problem for generating atmospheric particulate matter (PM_2.5) in Thailand. Increase in value-added rice straw such as production of rice straw particle board is an attractively promising product. The prevulcanized natural rubber-bonded rice straw particles using bis-(3-triethoxysilylpropyl)tetra sulphide (Si-69) acting as silane coupling agents were used to produce rice straw particle board. The effect of Si-69 concentrations of 2, 5, 7, and 10%w/v on the properties of rice straw particle board was investigated. The surfaces of treated rice straw particles were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). In addition, modulus of rupture (MOR), modulus of elasticity (MOE), internal bonding (IB) thickness swelling (TS) and water absorption (WA) of the prepared samples were measured. The result illustrated that the rice straw particle board was successfully manufactured using prevulcanized natural rubber and Si-69 coupling agent. The rice straw surface was fully covered by Si-69 and the amount of silicon and sulphur elements were increased with increasing Si-69 concentration. Consequently, the IB, MOR and MOE of the rice straw particle tended to increase with increasing Si-69 concentration. This is possibly due to good interfacial adhesion and reasonable stress transfer between rice straw particles and prevulcanized natural rubber as well as higher crosslink density of prevulcanized natural rubber. On the other hand, TS and WA of the rice straw particle were sharply decreased with increasing Si-69 concentration because the rice straw surface may be partially covered by the hydrophobic parts of Si-69.

燃烧稻草颗粒是产生大气颗粒物的一个问题（PM _2.5） 在泰国。增加稻草的附加值，例如稻草刨花板的生产是有吸引力的有前景的产品。以双-（3-三乙氧基甲硅烷基丙基）四硫化物（Si-69）为硅烷偶联剂的预硫化天然橡胶粘合稻草颗粒用于生产稻草颗粒板。研究了Si-69浓度为2、5、7和10％w / v对稻草刨花板性能的影响。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS）表征处理过的稻草颗粒的表面。另外，测量了所制备样品的断裂模量（MOR），弹性模量（MOE），内部键合（IB）厚度溶胀（TS）和吸水率（WA）。结果表明，使用预硫化的天然橡胶和Si-69偶联剂成功制备了稻草刨花板。稻草表面被Si-69完全覆盖，并且硅和硫元素的含量随Si-69浓度的增加而增加。因此，稻草颗粒的IB，MOR和MOE倾向于随着Si-69浓度的增加而增加。这可能是由于稻草秸秆颗粒与预硫化天然橡胶之间的良好界面粘合力和合理的应力传递以及预硫化天然橡胶的较高交联密度所致。另一方面，稻草颗粒的TS和WA随着Si-69浓度的增加而急剧降低，因为稻草表面可能被Si-69的疏水部分覆盖。