Hot embossing in microfabrication. Part I: Experimental

Yi Je Juang, L. Lee James, Kurt W. Koelling

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

The relationship among processing conditions, material properties, and part quality in hot embossing was investigated for three optical polymers: polycarbonate (PC), polymethyl methacrylate (PMMA), and polyvinyl butyral (PVB). A series of systematic embossing experiments was conducted using mold inserts having either single or multiple feature depths. The feature dimensions varied from 90 to 3000 μm. The processing conditions studied include embossing pressure, thermal cycles, and heating methods. The displacement profile, replication accuracy and molded-in stresses were measured experimentally. It was found that for isothermal embossing, both replication accuracy and birefringence pattern depend strongly on the processing conditions. For non-isothermal embossing, the molded parts showed excellent replication as long as the feature transfer was completed. The flow pattern under isothermal embossing resembles a biaxial extensional flow. Under non-isothermal embossing, the polymer deformation involves an upward flow along the wall of mold features, followed by downward compression and outward squeezing. Rheological characterization and hot embossing analysis are presented in Part II.

Original languageEnglish
Pages (from-to)539-550
Number of pages12
JournalPolymer Engineering and Science
Volume42
Issue number3
DOIs
Publication statusPublished - 2002 Mar 1

Fingerprint

Microfabrication
polycarbonate
Polymers
Processing
Polymethyl Methacrylate
Polycarbonates
Birefringence
Polymethyl methacrylates
Flow patterns
Materials properties
Heating
Experiments

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Juang, Yi Je ; Lee James, L. ; Koelling, Kurt W. / Hot embossing in microfabrication. Part I : Experimental. In: Polymer Engineering and Science. 2002 ; Vol. 42, No. 3. pp. 539-550.
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Hot embossing in microfabrication. Part I : Experimental. / Juang, Yi Je; Lee James, L.; Koelling, Kurt W.

In: Polymer Engineering and Science, Vol. 42, No. 3, 01.03.2002, p. 539-550.

Research output: Contribution to journalArticle

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