Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter
The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided b...
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| Format: | Article |
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MDPI AG
2021-04-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/7/1156 |
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| author | Dejia Chen Lisha Lei Meishuai Zou Xiaodong Li |
| author_facet | Dejia Chen Lisha Lei Meishuai Zou Xiaodong Li |
| author_sort | Dejia Chen |
| collection | DOAJ |
| description | The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time <i>t</i><sub>1/2</sub>. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and growth. |
| first_indexed | 2024-03-10T12:37:03Z |
| format | Article |
| id | doaj.art-c38ffff155af44dcac8612b7bd60bb8d |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T12:37:03Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-c38ffff155af44dcac8612b7bd60bb8d2023-11-21T14:12:45ZengMDPI AGPolymers2073-43602021-04-01137115610.3390/polym13071156Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-CalorimeterDejia Chen0Lisha Lei1Meishuai Zou2Xiaodong Li3School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, ChinaThe non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time <i>t</i><sub>1/2</sub>. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and growth.https://www.mdpi.com/2073-4360/13/7/1156fast-scan chip-calorimeternon-isothermal crystallization kineticspoly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide)diblock copolymerdouble-crystallizablefast cooling rate |
| spellingShingle | Dejia Chen Lisha Lei Meishuai Zou Xiaodong Li Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter Polymers fast-scan chip-calorimeter non-isothermal crystallization kinetics poly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide) diblock copolymer double-crystallizable fast cooling rate |
| title | Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter |
| title_full | Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter |
| title_fullStr | Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter |
| title_full_unstemmed | Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter |
| title_short | Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(<span style="font-variant: small-caps;">l</span>-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter |
| title_sort | non isothermal crystallization kinetics of poly ethylene glycol poly span style font variant small caps l span lactide diblock copolymer and poly ethylene glycol homopolymer via fast scan chip calorimeter |
| topic | fast-scan chip-calorimeter non-isothermal crystallization kinetics poly(ethylene glycol)–poly(<span style="font-variant: small-caps;">l</span>-lactide) diblock copolymer double-crystallizable fast cooling rate |
| url | https://www.mdpi.com/2073-4360/13/7/1156 |
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