Enhancing the robustness of nanostructures through the production of self-protective structures by injection molding of thermoplastic elastomers
Giacomo BARUFFA, Keltoum OUBELLAOUCH, Giulia ZANIBONI, Giovanni LUCCHETTA, Marco SORGATO
Abstract. Nanostructures are often proposed for anti-counterfeiting and decoration, yet their practical use is frequently limited by poor durability under mechanical stress and high production costs. To enhance the robustness of nanopatterns (specifically LIPSS), this study proposes a combined approach using sacrificial microstructures and elastomeric materials. The designed textures were fabricated through micro-injection molding (μ-IM) of thermoplastic elastomers (TPEs), a process suited for mass production. The process parameters were optimized to better understand the behavior of TPEs in μ-IM, with particular focus on replication fidelity and uniformity. Finally, the durability of the LIPSS was evaluated through abrasion tests. The results showed that melt temperature, mold temperature, and injection speed are the most influential process parameters. The integration of protective micropatterns and the use of TPE led to an increase in the durability of LIPSS of 37% and 18%, respectively.
Keywords
Thermoplastics, Micro Injection, Surface Functionalization
Published online 9/10/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Giacomo BARUFFA, Keltoum OUBELLAOUCH, Giulia ZANIBONI, Giovanni LUCCHETTA, Marco SORGATO, Enhancing the robustness of nanostructures through the production of self-protective structures by injection molding of thermoplastic elastomers, Materials Research Proceedings, Vol. 57, pp 303-310, 2025
DOI: https://doi.org/10.21741/9781644903735-35
The article was published as article 35 of the book Italian Manufacturing Association Conference
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] Florian C, Kirner S V, Krüger J, et al. Surface functionalization by laser-induced periodic surface structures. J Laser Appl; 32. https://doi.org/10.2351/7.0000103
[2] Chen F, Wang Y, Tian Y, et al. Robust and durable liquid-repellent surfaces. Chem Soc Rev 2022; 51: 8476–8583. https://doi.org/10.1039/D0CS01033B
[3] Wang D, Sun Q, Hokkanen MJ, et al. Design of robust superhydrophobic surfaces. Nature 2020; 582: 55–59. https://doi.org/10.1038/s41586-020-2331-8
[4] Luo W, Xu J, Li G, et al. Fabrication of robust, anti-reflective, transparent superhydrophobic coatings with a micropatterned multilayer structure. Langmuir 2022; 38: 7129–7136. https://doi.org/10.1021/acs.langmuir.2c00264
[5] Xu K, Hu J, Wang M, et al. Armored nanocones engraved by selective laser doping enhanced plasma etching for robust supertransmissivity. ACS Appl Mater Interfaces 2022; 14: 47237–47245. https://doi.org/10.1021/acsami.2c13033
[6] C. Su, Y. Xu, F. Gong, F. Wang, and C. Li, “The abrasion resistance of a superhydrophobic surface comprised of polyurethane elastomer,” Soft Matter, vol. 6, no. 24, pp. 6068–6071, 2010. https://doi.org/10.1039/c0sm00804d
[7] Yamauchi Y, Tenjimbayashi M, Samitsu S, et al. Durable and flexible superhydrophobic materials: abrasion/scratching/slicing/droplet impacting/bending/twisting-tolerant composite with porcupinefish-like structure. ACS Appl Mater Interfaces 2019; 11: 32381–32389. https://doi.org/10.1021/acsami.9b09524
[8] Hoshian S, Jokinen V, Franssila S. Robust hybrid elastomer/metal-oxide superhydrophobic surfaces. Soft Matter 2016; 12: 6526–6535. https://doi.org/10.1039/c6sm01095d
[9] Baruffi F, Calaon M, Tosello G. Effects of micro-injection moulding process parameters on accuracy and precision of thermoplastic elastomer micro rings. Precis Eng 2018; 51: 353–361. https://doi.org/10.1016/j.precisioneng.2017.09.006
[10] Vega MDJ, Mead J, Barry C. Injection molding microstructured substrates from rubber-containing polymers. In: AIP Conference Proceedings. AIP Publishing, 2016. https://doi.org/10.1063/1.4965463
[11] Birkar S, Mendible G, Park J, et al. Effect of feature spacing when injection molding parts with microstructured surfaces. Polym Eng Sci 2016; 56: 1330–1338. https://doi.org/10.5254/rct.14.86924
[12] Birkar S, Mead J, Barry C. Injection molding of thermoplastic elastomers for microstructured substrates. Rubber Chemistry and Technology 2014; 87: 629–646. https://doi.org/10.5254/rct.14.86924
[13] Stormonth‐Darling JM, Saeed A, Reynolds PM, et al. Injection Molding Micro‐and Nanostructures in Thermoplastic Elastomers. Macromol Mater Eng 2016; 301: 964–971. https://doi.org/10.1002/mame.201600011
