Shi Shih-Chen, Peng Yao-Qing
Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
Materials (Basel). 2021 Dec 13;14(24):7707. doi: 10.3390/ma14247707.
Hydroxypropyl methylcellulose (HPMC) and stearic acid (SA) are integrated to fabricate a double-layer thin film composite material with potential applications in sustainable packaging and coating materials. The effect of SA concentration on the moisture and wear resistance at the macroscale of the composite are studied. The amount of SA on the surface (>SA5H) is beneficial in increasing anti-wear behavior and reducing the friction coefficient by 25%. The petal-shaped crystals formed by SA are distributed on the surface of the double-layer film, increasing its hydrophobicity. When subjected to wear, the SA crystals on the surface of the double-layer film are fractured into debris-like abrasive particles, forming an optimal third-body of moderate shape and particle size, and imparting anti-wear and lubricating characteristics.
羟丙基甲基纤维素（HPMC）和硬脂酸（SA）被整合以制造一种双层薄膜复合材料，该材料在可持续包装和涂层材料方面具有潜在应用。研究了SA浓度对复合材料宏观尺度上的防潮性和耐磨性的影响。表面上SA的量（>SA5H）有利于增加抗磨损性能，并使摩擦系数降低25%。SA形成的花瓣状晶体分布在双层薄膜表面，增加了其疏水性。当受到磨损时，双层薄膜表面的SA晶体破碎成碎片状磨粒，形成形状和粒径适中的最佳第三体，并赋予抗磨损和润滑特性。
