Deformation behavior of solid polymer during hot embossing process

Liu, C.; Li, J. M.; Liu, Jiashun; Wang, L. D.

doi:10.1016/j.mee.2009.07.014

Cited by 54 publications

(29 citation statements)

References 12 publications

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“…It has been reported that the elastic modulus of dry Nafion membranes drops from 300 MPa at 25°C to 2-3 MPa at 110°C [24,25]. However, even above T g (»140°C), certain polymers are known to display residual elastic behavior, leading to spring back during the imprinting processes at these temperatures [26][27][28]. In our case, this could account for the observed difference between mold height and feature depth in Nafion, imprinted at temperatures above T g .…”

Section: Device Aspects and Ocv Measurementmentioning

confidence: 99%

Fabrication and Characterization of a Thin, Double‐sided Air Breathing Micro Fuel Cell

Mahmoodi

Besser

2018

Fuel Cells

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An air‐breathing micro fuel cell (μFC) with laterally fed porous anode electrode is realized and reported. The performance of this microdevice with embedded flow channels and electrodes is characterized in ambient conditions. To realize this device, we used negative epoxy‐based photoresist (SU‐8) as a stamp to transfer a microchannel pattern into a Nafion 1110 membrane by micro hot embossing. A Nafion 212 layer served to seal the device as a blanket top layer. The fabrication process of microchannels and μFC assembly is evaluated with optical and scanning electron microscopy (SEM) step by step. Variations of hydrogen feed rate on performance are investigated. The cell is composed of two individual fuel cells with a shared anode. The characteristics of the cell are further studied by performance and electrochemical impedance spectroscopy (EIS) measurements of the separate constituent cells and compared with data for the complete cell. The maximum power density per superficial (footprint) area is 68.4 mW cm−2 for the shared anode stack. In the present μFC architecture, the external packaging is Nafion polymer, which results in a thin and light energy source with simplicity of manufacturing. The device performance offers a high volumetric and gravimetric energy density for portable applications.

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Section: Device Aspects and Ocv Measurementmentioning

confidence: 99%

Fabrication and Characterization of a Thin, Double‐sided Air Breathing Micro Fuel Cell

Mahmoodi

Besser

2018

Fuel Cells

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“…3a-d are 1000 m, 1000 m, 1500 m and 1700 m, respectively. The parameters of FEA can be found in our former works (Liu et al, 2010). In Fig.…”

Section: Effects Of Embedded Sacrificial Layer On Multilayer Bondingmentioning

confidence: 99%

Fabrication of a thermoplastic multilayer microfluidic chip

Liu

et al. 2012

Journal of Materials Processing Technology

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“…For the relationship between the mold structure and the flow profile, Yong He etc [5] used the software DEFORM to study the effect of the mold duty ratio, ratio of the mold width to the polymer thickness, concave mold, convex mold and the non-symmetric mold on the polymer flow profile, and proposed the strategy of topology optimization of mold structure to improve the polymer filling efficiency. Liu etc [6] investigated the deformation behavior of solid polymer during hot embossing process, the swallowtail deformation due to the incomplete filling occurred during the heating and applying pressure process, and reduced during the remaining temperature and pressure process, but the deformation behavior of solid polymer is not explained clearly in the rolling embossing process. Song Xiao etc [7] established a theoretical model based on the principle of electroosmosis-driven micro flow, and used COMSOL Multiphysics simulation software to reveal the feature patterns and the properties of polymer.…”

Section: Introductionmentioning

confidence: 99%

Parameter Study on the Elastic Recovery Rate of Polymer Micro-channel by Rolling Embossing Process

Cheng¹

2017

IJMSA

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Abstract:To study the influence of process parameters on the elastic recovery rate of polymer micro-channel in the rolling embossing, the nonlinear finite element simulation software ABAQUS is employed. The simulated results show that the elastic recovery rate of micro-channel cross-section decreases with an increase of temperature and decrease of preloading and rolling speed. Using the orthogonal design method, the optimum temperature, preloading and rolling speed parameters can be obtained, the influence order of each factors is temperature>preloading height>rolling speed.

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Deformation behavior of solid polymer during hot embossing process

Cited by 54 publications

References 12 publications

Fabrication and Characterization of a Thin, Double‐sided Air Breathing Micro Fuel Cell

Fabrication and Characterization of a Thin, Double‐sided Air Breathing Micro Fuel Cell

Fabrication of a thermoplastic multilayer microfluidic chip

Parameter Study on the Elastic Recovery Rate of Polymer Micro-channel by Rolling Embossing Process

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