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首页> 美国卫生研究院文献>Polymers >Comparative Adhesion Ageing Resistance and Surface Properties of Wood Plastic Composite Treated with Low Pressure Plasma and Atmospheric Pressure Plasma Jet
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Comparative Adhesion Ageing Resistance and Surface Properties of Wood Plastic Composite Treated with Low Pressure Plasma and Atmospheric Pressure Plasma Jet

机译：低压等离子体和大气压等离子体射流处理的木塑复合材料的比较粘合性抗老化性和表面性能

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Wood plastic composites (WPCs) have poor adhesion properties due to their high surface concentration in non-polar polymers. In this work, two different plasma surface treatments, low pressure plasma (LPP) and atmospheric pressure plasma jet (APPJ), are proposed to increase the surface energy and adhesion property of WPC made with polyethylene (PE-WPC). After optimizing the conditions for each plasma surface treatment, the surface modifications and adhesion of PE-WPC treated with LPP and APPJ were compared. The optimal surface modifications of PE-WPC were obtained by treatment with Argon (Ar): Oxygen (O2) LPP for 90 s, and with air APPJ by using a plasma nozzle-WPC surface distance of one centimeter and speed of platform of one meter per minute. Both plasma treatments produced similar chemical modifications and surface energies on the PE-WPC surface. The ablation was more important for Ar:O2 LPP treatment, and the air APPJ treatment produced more extensive chemical modifications and more homogeneously removal of the wood component of the surface, rendering the polymer surface smoother. Adhesion of PE-WPC was similarly improved by treatment with both plasmas, from 56 N/m in the as-received to 92–102 N/m in the plasma treated PE-WPC joints. The influence of ageing at 24 °C and 40% relative humidity of the adhesive joints made with PE-WPC surface and treated with Ar:O2 LPP and APPJ plasmas was studied. In the joints made with plasma-treated PE-WPC aged under open air for more than one day, the adhesion decreased. An adhesive strength near to that of the joint made with the as-received PE-WPC was obtained after six days. However, if the adhesive joint was created immediately after plasma treatment and peeled at different times, the adhesion was maintained and even increased, and the hydrophobic recovery of the plasma-treated PE-WPC surface was inhibited.
机译：木质塑料复合材料（WPC）由于其在非极性聚合物中的高表面浓度而具有较差的粘合性能。在这项工作中，提出了两种不同的等离子体表面处理方法，低压等离子体（LPP）和大气压等离子体射流（APPJ），以提高用聚乙烯制成的WPC（PE-WPC）的表面能和粘附性能。在优化了每种等离子体表面处理的条件之后，比较了用LPP和APPJ处理的PE-WPC的表面改性和附着力。 PE-WPC的最佳表面改性是通过使用等离子喷嘴-WPC表面距离为1厘米，平台速度为1米，用氩气（Ar）：氧气（O2）LPP处理90 s和空气APPJ获得的每分钟。两种等离子体处理都在PE-WPC表面产生了相似的化学修饰和表面能。对于Ar：O2 LPP处理而言，烧蚀更为重要，而空气APPJ处理产生了更广泛的化学改性，并更均匀地去除了表面的木材成分，从而使聚合物表面更加光滑。通过使用两种等离子体处理，PE-WPC的粘附性也得到了类似的改善，从最初的56 N / m到等离子体处理过的PE-WPC接头的92-102 N / m。研究了在PE-WPC表面制作的Ar：O2 LPP和APPJ等离子体处理的粘接接头在24°C和40％相对湿度下的老化影响。用等离子处理的PE-WPC制成的关节在露天下老化超过一天，其粘合力下降。在六天后获得接近于用所接收的PE-WPC制成的接头的粘合强度。但是，如果在等离子处理之后立即创建粘合剂接头并在不同的时间剥离，则粘合力得以维持甚至增加，并且等离子处理的PE-WPC表面的疏水性恢复受到抑制。

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