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首页> 外文期刊>Journal of Micromechanics and Microengineering >An investigation of the detrimental impact of trapped air in thermoplastic micro-embossing
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An investigation of the detrimental impact of trapped air in thermoplastic micro-embossing

机译：热塑性微压纹中滞留空气的有害影响的研究

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摘要

In hot micro-embossing, a thermally softened polymer is forced into the cavities of a patterned stamp. If embossing is performed in normal atmospheric surroundings, it is possible for air to become trapped inside the cavities of the stamp, impeding pattern replication. We present a fast simulation technique that captures the impact of trapped air in the micro-embossing process. The technique can predict the extent of stamp cavity filling for any given stamp design and linear viscoelastic polymer properties, under the assumption that air, once trapped inside a cavity, is unable to escape. We find that the smaller the effective stiffness of the softened polymer relative to the surrounding atmospheric pressure, the more severe the impact of trapped air. Moreover, the trapping of air becomes more detrimental as the widths of stamp cavities become a larger proportion of their lateral spacing. The results of embossing experiments with two widely used thermoplastic polymers, Zeonor 1060R and polymethylmethacrylate, agree with simulation results and indicate that there is little permeation of trapped air in these materials during a typical embossing process of up to 15 min duration, carried out at between 5 and 45℃ above their glass-transition temperatures.
机译：在热微压花中，将热软化的聚合物压入图案化压模的腔中。如果在正常的大气环境中进行压花，则空气可能会滞留在压模的腔体内，从而阻碍图案复制。我们提出了一种快速的模拟技术，可以捕获微压印过程中滞留的空气的影响。该技术可以在假设空气一旦被困在腔体内而无法逸出的前提下，预测任何给定的图章设计和线性粘弹性聚合物特性所产生的模腔填充程度。我们发现，相对于周围大气压力，软化聚合物的有效刚度越小，滞留空气的影响就越严重。此外，随着压模腔的宽度占其横向间隔的更大比例，空气的捕获变得更加有害。使用两种广泛使用的热塑性聚合物Zeonor 1060R和聚甲基丙烯酸甲酯进行压花实验的结果与模拟结果相符，并且表明在长达15分钟的典型压花过程中，这些材料中几乎没有滞留的空气渗透到这些材料中，在15比玻璃转化温度高5和45℃。

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