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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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Parylene C coating for high-performance replica molding.

Kevin A Heyries1, Carl L Hansen

  • 1Centre for High-Throughput Biology, University of British Columbia, Vancouver, BC, Canada.

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Summary
This summary is machine-generated.

This study introduces parylene C coatings for soft lithography, enhancing microfabrication by improving mold release and master durability for high-density, high-aspect-ratio polymer devices.

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Area of Science:

  • Materials Science
  • Microfabrication
  • Polymer Chemistry

Background:

  • Soft lithography is a key technique for microfabrication.
  • Releasing polymer devices from microfabricated masters can be challenging, especially with high-aspect-ratio features.
  • Protecting masters during repeated molding cycles is crucial for cost-effective fabrication.

Purpose of the Study:

  • To improve the soft lithography process using chemical vapor deposition (CVD) of parylene C.
  • To enhance the release of polymer devices from microfabricated masters.
  • To extend the lifespan and compatibility of microfabricated masters with various polymers.

Main Methods:

  • Chemical vapor deposition (CVD) of parylene C onto silicon masters with SU8 pillars.
  • Characterization of parylene C coating thickness and conformality.
  • Testing mold release properties with poly(dimethylsiloxane) (PDMS) and hard polymers like poly(urethane).
  • Evaluating master durability over multiple molding cycles.

Main Results:

  • Nanometer-thick conformal parylene C coatings were successfully applied to SU8 microstructures.
  • A single parylene C coating significantly improved PDMS mold release.
  • Parylene C protected masters for an indefinite number of molding cycles.
  • Masters treated with parylene C enabled fabrication with hard polymers, expanding material compatibility.

Conclusions:

  • Parylene C CVD is an effective method to improve mold release in soft lithography.
  • Parylene C coatings enhance the durability and reusability of microfabricated masters.
  • This technique allows for the fabrication of high-density, high-aspect-ratio features using a wider range of polymers.