Abstract
Precision micromolding of polypropylene (PP), polyoxymethylene (POM) and polycarbonate (PC) were performed to develop a micro-scale miniature disc and to clarify the mechanism of structure development in micromolded products. Especially effects of process conditions and cavity thickness on surface properties and structure formation in micromolding were evaluated. These structures of molded products were also analyzed by MDSC, birefringence, and SPM measurements. In case of PC micro-disc products, the molecular orientation in the vicinity of the gate was higher than that of any other position. Birefringence also increased with decreasing cavity thickness. Furthermore it was found that the resin flow became unstable in the cavity thickness of 0.1 mm. From observation of cross-section of molded products, skin-shear-core structures were analyzed. The surface elasticity modulus of products in the vicinity of the gate was higher than that of flow end portion.
| Original language | English |
|---|---|
| Number of pages | 1 |
| Publication status | Published - 2006 Dec 1 |
| Event | 55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan Duration: 2006 Sep 20 → 2006 Sep 22 |
Other
| Other | 55th Society of Polymer Science Japan Symposium on Macromolecules |
|---|---|
| Country | Japan |
| City | Toyama |
| Period | 06/9/20 → 06/9/22 |
Keywords
- Elasticity modulus
- Micro-disc
- Micromolding
- Microstructure
- Optical anisotropy
- Skin-core structure
ASJC Scopus subject areas
- Engineering(all)