Strategies for High Quality Injection Moulding of Polymer Nanopillars

Pedersen, Rasmus H.; Xu, Qian; Stormonth-Darling, John M.; Gadegaard, Nikolaj

doi:10.1002/mame.201400134

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Indeed, Figure 3b shows a columnar hexagonal array formed by nanopillars of 222 ± 18 nm in diameter with a pitch of 450 ± 10 nm and with a depth of 122 ± 7 nm. The quality of the replication of the hexagonal pillar arrays is qualitatively comparable to the obtained by NIL [2a,8] …”

Section: Resultssupporting

confidence: 74%

3D Printing‐Assisted Nanoimprint Lithography of Polymers

et al. 2023

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Fused filament fabrication, commonly referred to as 3D printing, is an additive manufacturing method finding plenty of applications nowadays. In contrast, polymer nanopatterning by nanolithographic techniques plays an important role in obtaining functional surfaces and coatings for applications in different fields including micro‐ and nanoelectronics. In spite of their relevance, additive manufacturing and polymer nanolithography have not found yet a common niche to be developed. Although both approaches are oriented to achieve different types of objects, it is shown that the confluence of both technologies can be desirable and potentially convenient. Herein, it is demonstrated that by employing conventional 3D printing, it is possible to fabricate nanostructured polymer surfaces in a relatively simple way by using similar approaches as those used in nanoimprint lithography but without the need for clean room conditions. To do that, a printed‐assisted nanoimprint lithography concept (3DPrANIL) has been tested for different types of polymer and silicon templates. It is demonstrated that a polymeric nanostructured hydrophilic template can be replicated accurately on another polymer rendering a nanostructured surface with enhanced hydrophobicity. The results support 3DPrANIL as novel method to obtain micro‐ and nanostructured surfaces with different functionalities like iridescence and hydrophobicity.

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Section: Resultssupporting

confidence: 74%

3D Printing‐Assisted Nanoimprint Lithography of Polymers

et al. 2023

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“…Micro-nanometric dimensioned mold inserts require particular methods to be produced. These methods include (I) LIGA based (lithography, electroplating, molding) technologies (LIGA, UV-LIGA, IB-LIGA, EB-LIGA) [52][53][54][55][56] ; (II) 3D micro machining that regroups micro electrical discharge machining (µEDM), micro mechanical milling and electrochemical machining (ECM) using ultra-short pulses 12,44,57 ; (III) silicon wet etching 58 ; (IV) deep reaction ion etching (DRIE) 1 ; (V) thick deep UV resists; (VI) laser ablation 51,57,[59][60][61][62] , (VII) plasma treatment 1, [63][64][65][66] , microdrilling and micro-turning 67 .…”

Section: Insert Fabrication Methodsmentioning

confidence: 99%

Micro-nanostructured polymer surfaces using injection molding: A review

Maghsoudi

Jafari

Momen

et al. 2017

Materials Today Communications

131

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Micro injection molding is in great demand due to its efficiency and applicability for industry. Polymer surfaces having micro-nanostructures can be produced using injection molding. However, it is not as straightforward as scaling-up of conventional injection molding. The paper is organized based on three main technical areas: mold inserts, processing parameters, and demolding. An accurate set of processing parameters is required to achieve precise micro injection molding. This review provides a comparative description of the influence of processing parameters on the quality of final parts and the precision of final product dimensions in both thermoplastic polymers and rubber materials. It also highlights the key parameters to attain a high quality micro-nanostructured polymer and addresses the contradictory effects of these parameters on the final result. Moreover, since the produced part should be properly demolded to possess a high quality textured polymer, various demolding techniques are assessed in this review as well.

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“…Introduction of an interfacial thermal resistance at the cavity surface will slow the solidification of the melt, and has been shown to improve replication . A similar effect is achieved with an insert made in a material with a lower thermal diffusivity, for example, using a nonmetallic material .…”

Section: Replication Of Micro‐features In Injection Moldingmentioning

confidence: 99%

Replication of surface micro‐features using variothermal injection molding: Application to micro‐fluidics

Pittman¹,

Wlodarski²

2017

Polymer Engineering & Sci

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We study injection molding of mesoscale items with µm‐scale surface features, namely micro‐fluidic channels, relating replication quality to process conditions. Using variothermal molding, the variables are the pre‐heat temperature of the cavity insert surface before melt injection and the mold cooling start time. Surface temperatures and in‐cavity melt pressures are continuously measured. Rounded upper corners of the micro‐channels are used as an index of replication quality. For polymethylmethacrylate the thickness of a layer with solid‐like properties (below 124°C) is calculated and used with pressures to interpret results. It is shown how improved replication correlates with low layer thickness at the end of the compression phase when pressures are at a maximum, and the necessity of properly timed cooling to lock in replication before melt pressures fall. Results show how the inter‐relationship of layer thickness and melt pressure is controlled by pre‐heat temperature and cooling switch‐on time. Delayed cooling can result in poorer replication, due to a retraction effect of the plastic. Too early cooling also reduces replication of parallel‐to‐flow features downstream of transverse features, and of the replication of transverse features on their downstream side. Good replication of 100 and 70 µm channels requires lower pre‐heat than 400 µm ones. POLYM. ENG. SCI., 58:1726–1738, 2018. © 2017 Society of Plastics Engineers

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Strategies for High Quality Injection Moulding of Polymer Nanopillars

Cited by 8 publications

References 23 publications

3D Printing‐Assisted Nanoimprint Lithography of Polymers

3D Printing‐Assisted Nanoimprint Lithography of Polymers

Micro-nanostructured polymer surfaces using injection molding: A review

Replication of surface micro‐features using variothermal injection molding: Application to micro‐fluidics

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