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Functionalization of Plastic Parts by Replication of Variable Pitch Laser-Induced Periodic Surface Structures

机译：通过复制变距激光诱导的周期性表面结构来实现塑料零件的功能化

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Surface functionalization of plastic parts has been studied and developed for several applications. However, demand for the development of reliable and profitable manufacturing strategies is still high. Here we develop and characterize a new process chain for the versatile and cost-effective production of sub-micron textured plastic parts using laser ablation. The study includes the generation of different sub-micron structures on the surface of a mold using femtosecond laser ablation and vario-thermal micro-injection molding. The manufactured parts and their surfaces are characterized in consideration of polymer replication and wetting behavior. The results of the static contact angle measurements show that replicated Laser-Induced Periodic Surface Structures (LIPSSs) always increase the hydrophobicity of plastic parts. A maximum contact angle increase of 20% was found by optimizing the manufacturing thermal boundary conditions. The wetting behavior is linked to the transition from a Wenzel to Cassie–Baxter state, and is crucial in optimizing the injection molding cycle time.
机译：已经研究并开发了塑料零件的表面功能化，以用于多种应用。然而，对开发可靠且有利可图的制造策略的需求仍然很高。在这里，我们开发并描述了一条新的工艺链，以利用激光烧蚀实现多功能且经济高效的亚微米质感塑料零件生产。该研究包括使用飞秒激光烧蚀和可变热微注射成型在模具表面上产生不同的亚微米结构。考虑到聚合物复制和润湿行为，对制造的零件及其表面进行了表征。静态接触角测量的结果表明，重复的激光诱导周期性表面结构（LIPSSs）始终会增加塑料零件的疏水性。通过优化制造热边界条件，发现最大接触角增加了20％。润湿行为与从Wenzel态到Cassie–Baxter态的转变有关，并且对于优化注塑成型周期时间至关重要。

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