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Tribological Properties between Taut Hair Fibers in Wet Conditions: A New Shampoo Formulation for Eliminating Stick-Slip Friction
Journal of Surfactants and Detergents ( IF 1.6 ) Pub Date : 2021-03-24 , DOI: 10.1002/jsde.12499
Takumi Miyamoto 1 , Naoyuki Yamazaki 2 , Ayumi Tomotsuka 2 , Hisamu Sasahara 1 , Shunichi Watanabe 2 , Shinji Yamada 1
Affiliation  

The tribological properties between taut hair fibers in wet conditions were investigated to evaluate the tangling/detangling performance of shampoo formulations during washing (particularly rinsing). A new setup for friction measurements between taut hair fibers was established. Using the setup, tribological properties of hair fibers treated with two shampoo formulations, whose tangling performances were different, were investigated. The base formulation for the shampoos was the same; the only difference was the type of amino-modified silicones used as conditioning agents. Shampoo (Sp) A (poor detangling performance) incudes water-insoluble silicone, and Sp B (excellent detangling performance) includes water-soluble silicone. The tribological behaviors between taut hair fibers treated with the diluted solutions of the Sp were very different; the Sp A-treated hair exhibited stick-slip sliding, whereas the Sp B-treated hair exhibited smooth sliding. This difference presumably comes from the different coacervation behaviors in the diluted solutions and resulting structure of conditioning film formed on hair surfaces. The smooth sliding (ideal for detangling) of Sp B-treated hair comes from the two-layer structure of the conditioning film on hair; positively charged amino-modified silicone dissolved in water adsorbed immediately on negatively charged hair surface, followed by the physical adsorption of coacervates on the adsorbed silicone layer. The outer coacervate layer is easily removed during sliding, and smooth sliding comes from the low friction of the silicone layer. The relationship between the type of amino-modified silicones, conditioning film formation on the surface, and tribological properties was discussed, which gives insights into designing Sp formulations with excellent detangling performance.

中文翻译:

潮湿条件下绷紧的头发纤维之间的摩擦学特性:消除粘滑摩擦的新型洗发水配方

拉紧之间的摩擦学特性研究了在潮湿条件下的头发纤维,以评估洗发剂配方在洗涤(尤其是漂洗)过程中的缠结/缠结性能。建立了一种用于拉紧头发纤维之间摩擦力的新设置。使用该设置,研究了两种纠缠性能不同的洗发水配方处理的头发纤维的摩擦学性能。洗发剂的基本配方是相同的。唯一的区别是用作调理剂的氨基改性有机硅的类型。洗发水(Sp)A(差的缠结性能)会导致水不溶性有机硅,而Sp B(出色的缠结性能)会包含水溶性有机硅。Sp稀释溶液处理的绷紧的头发纤维之间的摩擦学行为有很大的不同。Sp A处理的头发表现出粘滑滑动,而Sp B处理的头发表现出平滑滑移。这种差异可能是由于稀释溶液中的凝聚行为不同以及在头发表面形成的调理膜的结构而引起的。Sp B处理过的头发的顺滑滑动(理想的缠结)来自头发上调理膜的两层结构。溶解在水中的带正电荷的氨基改性有机硅会立即吸附在带负电的头发表面,然后凝聚层在吸附的有机硅层上发生物理吸附。凝聚层外层在滑动过程中很容易被去除,平滑的滑动来自硅树脂层的低摩擦力。氨基改性有机硅的类型与表面调节膜的形成之间的关系,
更新日期:2021-05-19
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