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Re-Investigation on Periodic Assembly in Crystallized Poly(ethylene adipate) by Dissecting into Internal Architecture
Chi-Hsuan Su1, Selveraj Nagarajan1, Chean-Cheng Su2
1Department of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.
Microscopy of crystallized poly(ethylene adipate) (PEA) reveals surface patterns correlate with internal structures. Advanced 3D dissection offers new insights into crystal aggregation mechanisms.
Area of Science:
- Polymer Science
- Materials Science
- Crystallography
Background:
- Poly(ethylene adipate) (PEA) crystallizes into double ring-banded spherulites at 28 °C.
- Surface morphology of spherulites often provides indirect information about internal structure.
Purpose of the Study:
- To investigate the correlation between the internal structure and surface relief patterns of PEA spherulites.
- To elucidate the mechanisms of periodic crystal aggregation in PEA using advanced 3D analysis.
Main Methods:
- Microscopy analysis of 3D-dissected crystallized poly(ethylene adipate) (PEA).
- Isothermal crystallization at 28 °C.
- Advanced dissection techniques to reveal bulk interior structures.
Main Results:
- Complete surface-relief patterns were obtained, correlating with interior periodic assembly profiles.
- Variable ridge band widths on the top surface were observed, linked to lamellar slant angles.
- Detailed interior structures provided critical correlations between internal assembly and surface banding patterns.
Conclusions:
- Analysis of PEA spherulites cannot be limited to surface-relief patterns alone.
- 3D views of bulk interiors offer breakthrough insights into crystal aggregation mechanisms.
- Advanced dissection techniques provide unique clarity on periodic crystal aggregation.
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