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 language | English |
|---|---|
| Pages (from-to) | 539-550 |
| Number of pages | 12 |
| Journal | Polymer Engineering and Science |
| Volume | 42 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2002 Mar 1 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Polymers and Plastics
- Materials Chemistry
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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 journal › Article
TY - JOUR
T1 - Hot embossing in microfabrication. Part I
T2 - Experimental
AU - Juang, Yi Je
AU - Lee James, L.
AU - Koelling, Kurt W.
PY - 2002/3/1
Y1 - 2002/3/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0036502108&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036502108&partnerID=8YFLogxK
U2 - 10.1002/pen.10970
DO - 10.1002/pen.10970
M3 - Article
AN - SCOPUS:0036502108
VL - 42
SP - 539
EP - 550
JO - Polymer Engineering and Science
JF - Polymer Engineering and Science
SN - 0032-3888
IS - 3
ER -