In-Situ Isothermal Crystallization of Poly(l-lactide)
The isothermal crystallization of poly(l-lactide) (PLLA) has been investigated by in-situ wide angle X-ray diffraction (WAXD) and polarized optical microscopes (POM) equipped with a hot-stage accessory. Results showed that the spherulites of PLLA were formed at high temperature, whereas irregular mo...
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| Veröffentlicht in: | Polymers 2021-09, Vol.13 (19), p.3377 |
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| creator | Huang, Zirui Zhong, Meiling Yang, Haibo Xu, Enqin Ji, Dehui Joseph, Paul Zhang, Ri-Chao |
| description | The isothermal crystallization of poly(l-lactide) (PLLA) has been investigated by in-situ wide angle X-ray diffraction (WAXD) and polarized optical microscopes (POM) equipped with a hot-stage accessory. Results showed that the spherulites of PLLA were formed at high temperature, whereas irregular morphology was observed under a low temperature. This can be attributed to the varying rates of crystallization of PLLA at different temperatures. At low temperatures, the nucleation rate is fast and hence the chains diffuse very slow, resulting in the formation of imperfect crystals. On the other hand, at high temperatures, the nucleation rate is slow and the chains diffuse fast, leading to the formation of perfect crystals. The change in the value of the Avrami exponent with temperature further verifies the varying trend in the morphological feature of the crystals. |
| doi_str_mv | 10.3390/polym13193377 |
| format | Article |
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Results showed that the spherulites of PLLA were formed at high temperature, whereas irregular morphology was observed under a low temperature. This can be attributed to the varying rates of crystallization of PLLA at different temperatures. At low temperatures, the nucleation rate is fast and hence the chains diffuse very slow, resulting in the formation of imperfect crystals. On the other hand, at high temperatures, the nucleation rate is slow and the chains diffuse fast, leading to the formation of perfect crystals. The change in the value of the Avrami exponent with temperature further verifies the varying trend in the morphological feature of the crystals.</description><identifier>ISSN: 2073-4360</identifier><identifier>EISSN: 2073-4360</identifier><identifier>DOI: 10.3390/polym13193377</identifier><identifier>PMID: 34641192</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Chains ; Cooling ; Crystal defects ; Crystal structure ; Crystallization ; High temperature ; Low temperature ; Microscopes ; Molecular weight ; Morphology ; Nitrogen ; Nucleation ; Optical microscopes ; Polymers ; Spherulites</subject><ispartof>Polymers, 2021-09, Vol.13 (19), p.3377</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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Results showed that the spherulites of PLLA were formed at high temperature, whereas irregular morphology was observed under a low temperature. This can be attributed to the varying rates of crystallization of PLLA at different temperatures. At low temperatures, the nucleation rate is fast and hence the chains diffuse very slow, resulting in the formation of imperfect crystals. On the other hand, at high temperatures, the nucleation rate is slow and the chains diffuse fast, leading to the formation of perfect crystals. The change in the value of the Avrami exponent with temperature further verifies the varying trend in the morphological feature of the crystals.</abstract><cop>Basel</cop><pub>MDPI AG</pub><pmid>34641192</pmid><doi>10.3390/polym13193377</doi><orcidid>https://orcid.org/0000-0003-2355-1959</orcidid><orcidid>https://orcid.org/0000-0001-9444-4099</orcidid><orcidid>https://orcid.org/0000-0002-5503-9979</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Chains Cooling Crystal defects Crystal structure Crystallization High temperature Low temperature Microscopes Molecular weight Morphology Nitrogen Nucleation Optical microscopes Polymers Spherulites |
| title | In-Situ Isothermal Crystallization of Poly(l-lactide) |
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