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The fabrication and molecular alignment of poly(ethylene oxide) grating film based on hot embossing technology

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Abstract

Hot embossing technology, regarded as one of the most promising and cost-effective methods to fabricate high-precision and high-quality patterns at micrometer or nanometer scales, has been attracting more attention. In our demonstration here, we mainly employ a hot embossing technique based on a poly(dimethylsiloxane) (PDMS) template to fabricate a grating pattern structure for a polymer poly(ethylene oxide) (PEO) thin film. The hot embossing process mainly consists of the preparation of a pristine film, embossing under a suitable heating temperature and pressure, and demolding the template from the embossing system. A uniform, regular and periodic topographical grating morphology has been obtained on the surface of a polymer PEO film of obvious use for a large area. Grazing incidence wide angle X-ray diffraction (GIWAXD) is employed to illustrate that hot embossing technology is able not only to successfully fabricate the topographical grating structures of a PEO grating thin film, but also interestingly to induce the formation of a highly oriented flat-on lamellar alignment or molecular alignment structure inside the grating pattern structure of a PEO grating film. A tilt orientation mode is identified for the pristine PEO film; however, it is striking to find that a flat-on orientation is induced for the PEO grating film by the hot embossing process. Furthermore, there is miraculously only a flat-on orientation within the grating film and the highly oriented flat-on lamellar alignment can be achieved at various temperatures.

Graphical abstract: The fabrication and molecular alignment of poly(ethylene oxide) grating film based on hot embossing technology

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Publication details

The article was received on 19 Jul 2019, accepted on 03 Oct 2019 and first published on 05 Oct 2019


Article type: Paper
DOI: 10.1039/C9NJ03753E
New J. Chem., 2019, Advance Article

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    The fabrication and molecular alignment of poly(ethylene oxide) grating film based on hot embossing technology

    Z. Song, M. Qian, H. Zhang, T. Wang, G. Ding and J. Liu, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ03753E

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