Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae
This study, using atomic-force and polarized-optical light (AFM and POM) microscopies on the extinction banded spherulites of poly(dodecamethylene terephthalate) (P12T) at high Tc = 110 °C with a film thickness kept at 1–3 µm, has verified that banded spherulites can be composed of stacks of entirel...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-09-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/7/9/274 |
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| author | Eamor M. Woo Graecia Lugito Cheng-En Yang Shih-Ming Chang |
| author_facet | Eamor M. Woo Graecia Lugito Cheng-En Yang Shih-Ming Chang |
| author_sort | Eamor M. Woo |
| collection | DOAJ |
| description | This study, using atomic-force and polarized-optical light (AFM and POM) microscopies on the extinction banded spherulites of poly(dodecamethylene terephthalate) (P12T) at high Tc = 110 °C with a film thickness kept at 1–3 µm, has verified that banded spherulites can be composed of stacks of entirely single-crystal-like lamellae free of any twisting, flipping, or bending, and no branching of lamellae. Defects in the crystal packing of extinction bands are present in both intra-band and inter-band regions. The intra-band defects originate from the miss-match in spiral-circling into circular bands while the inter-band defects are in the interfaces between successive bands where single crystals in the ridge are jammed to deformation, then suddenly precipitate prior to initiating another cycle of banding. The fish-scale lamellae, at the initiation of a cycle, are orderly packed as terrace-like single crystals; conversely, near or on the defected regions, they are highly jammed or squeezed and deformed to beyond recognition of their original single-crystal nature. |
| first_indexed | 2024-04-11T21:45:33Z |
| format | Article |
| id | doaj.art-0a27e4575cfb42089726c28d7e76e303 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T21:45:33Z |
| publishDate | 2017-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-0a27e4575cfb42089726c28d7e76e3032022-12-22T04:01:25ZengMDPI AGCrystals2073-43522017-09-017927410.3390/cryst7090274cryst7090274Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like LamellaeEamor M. Woo0Graecia Lugito1Cheng-En Yang2Shih-Ming Chang3Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, TaiwanDepartment of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, TaiwanDepartment of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, TaiwanDepartment of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, TaiwanThis study, using atomic-force and polarized-optical light (AFM and POM) microscopies on the extinction banded spherulites of poly(dodecamethylene terephthalate) (P12T) at high Tc = 110 °C with a film thickness kept at 1–3 µm, has verified that banded spherulites can be composed of stacks of entirely single-crystal-like lamellae free of any twisting, flipping, or bending, and no branching of lamellae. Defects in the crystal packing of extinction bands are present in both intra-band and inter-band regions. The intra-band defects originate from the miss-match in spiral-circling into circular bands while the inter-band defects are in the interfaces between successive bands where single crystals in the ridge are jammed to deformation, then suddenly precipitate prior to initiating another cycle of banding. The fish-scale lamellae, at the initiation of a cycle, are orderly packed as terrace-like single crystals; conversely, near or on the defected regions, they are highly jammed or squeezed and deformed to beyond recognition of their original single-crystal nature.https://www.mdpi.com/2073-4352/7/9/274polymer crystallizationlamellar assemblypoly(dodecamethylene terephthalate)dislocationextinction bands |
| spellingShingle | Eamor M. Woo Graecia Lugito Cheng-En Yang Shih-Ming Chang Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae Crystals polymer crystallization lamellar assembly poly(dodecamethylene terephthalate) dislocation extinction bands |
| title | Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae |
| title_full | Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae |
| title_fullStr | Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae |
| title_full_unstemmed | Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae |
| title_short | Atomic-Force Microscopy Analyses on Dislocation in Extinction Bands of Poly(dodecamethylene terephthalate) Spherulites Solely Packed of Single-Crystal-Like Lamellae |
| title_sort | atomic force microscopy analyses on dislocation in extinction bands of poly dodecamethylene terephthalate spherulites solely packed of single crystal like lamellae |
| topic | polymer crystallization lamellar assembly poly(dodecamethylene terephthalate) dislocation extinction bands |
| url | https://www.mdpi.com/2073-4352/7/9/274 |
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