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Bioinspired Self-Assembled 3D Patterned Polymer Textures as Skin Coatings Models: Tribology and Tactile Behavior
University of Massachusetts, USA.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0001-6657-1592
L'Oreal, France.
L'Oreal, USA.
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2020 (English)In: Biotribology, ISSN 2352-5738, Vol. 24, article id 100151Article in journal (Refereed) Published
Abstract [en]

It is well known that during evolution, specific surface patterns emerged (e.g., on lotus leaves and butterfly wings) endowed with many remarkable surface properties (superhydrophobicity, vibrant structural color, delicate textures, etc.). In order to obtain these natural effects in cosmetics, we look for ways to transfer topographic patterns in coatings and treatments. Textured polymer surfaces were studied to explore their friction properties on the microscale and possible correlations with human tactile friction on the macroscale. We have chosen self-assembling block and random copolymers as model systems to prepare reliable biomimetic films with different micrometer and nanometer scale randomly patterned and randomly rough surfaces. The surface texture of the films was characterized by atomic force microscopy (AFM), and their tribological (friction) properties were studied with a surface forces apparatus (SFA) at a low sliding speed of 3 μm/s and at a speed of 10 cm/s relevant to realistic applications. The results are evaluated in terms of polymer segment mobility, interpenetration, entanglement and relaxation at interfaces, surface texture as described by roughness parameters, and interlocking of asperities. A stiction spike (static friction) was commonly found for the randomly patterned glassy polymer films. Random roughness patterns made from semi-crystalline polymers above their Tg gave high friction at low speed, but their friction coefficients were reduced at high speed due to less time for local entanglement and relaxations. The friction response of one of them was also affected differently by humidity than that of glassy polymer films. Tactile friction measurements with a human finger sliding against the polymer films revealed that the textures also provided differences at the macroscale, although the dynamic changes possibly due to lipid transfer, occlusion of moisture and/or damage of the films makes it difficult to draw robust conclusions. Finally, as an example, it is shown that these textures can be transferred to a soft elastomeric skin mimic substrate. This study introduces the concept of surface patterning by self-assembly to deliver tactile sensorial properties in coatings.

Place, publisher, year, edition, pages
Elsevier Ltd. , 2020. Vol. 24, article id 100151
Keywords [en]
Atomic force microscopy, Polymer self-assembly, Roughness, Skin model, Surface forces apparatus, Surface texture, Tactile friction, Tribology
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-50964DOI: 10.1016/j.biotri.2020.100151Scopus ID: 2-s2.0-85096177812OAI: oai:DiVA.org:ri-50964DiVA, id: diva2:1510833
Note

Funding text 1: CC, JCC, and GSL are full time employees of L’Oréal. RJ, LS, MWR, and MR have received funding from L’Oréal Research and Innovation.; Funding text 2: We would like to thank J. Israelachvili for helpful discussions in the early stages of the project and for his mentoring of MR and GSL. We also thank K. Kristiansen and J. Scott of SurForce LLC for their assistance with the high speed SFA attachment, and X. Xu for help with sample preparation. This project was supported by L'Oreal Research and Innovation.

Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2023-05-25Bibliographically approved

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Skedung, LisaRutland, Mark W.

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