Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry
Crystallinity is important to the properties of a semi-crystalline fluoropolymer, such as solubility, mechanical property, bonding strength, etc. This study extended the use of 19F Low-Field Nuclear Magnetic Resonance (19F LF-NMR) to the measurement of crystallinity in the semi-crystalline fluoropol...
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| Language: | English |
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Elsevier
2024-12-01
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| Series: | Polymer Testing |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142941824003313 |
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| author | Zhangyu Wu Xianru He Chunhua Zhu Huaisong Yong Xueyan Zhao |
| author_facet | Zhangyu Wu Xianru He Chunhua Zhu Huaisong Yong Xueyan Zhao |
| author_sort | Zhangyu Wu |
| collection | DOAJ |
| description | Crystallinity is important to the properties of a semi-crystalline fluoropolymer, such as solubility, mechanical property, bonding strength, etc. This study extended the use of 19F Low-Field Nuclear Magnetic Resonance (19F LF-NMR) to the measurement of crystallinity in the semi-crystalline fluoropolymer F2314, which is the copolymer of vinylidene fluoride (VDF) and chlorotrifluoroethylene (CTFE) with a molar ratio of 1:4 and commonly used as binder in polymer-bonded explosives (PBXs). Based on the difference between spin-spin relaxometry of the 19F in crystalline region and in amorphous region, the crystallinity of F2314 can be qualitatively characterized. The obtained crystallinity exhibited a positive correlation to the time duration of thermal treatment, which is in consistent to the result of Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD). Moreover, 19F LF-NMR detected the slight decrease in segmental motion of crystalline region with the increase of crystallinity, and on-line monitored the evolution of segmental motion during heating. This study not only demonstrates the practicality and reliability of 19F LF-NMR in quantification of crystallinity, but also laid the foundation for in-situ characterization of fluoropolymers in PBXs in future work. |
| format | Article |
| id | doaj-art-4c0b6a1672a5492085fb15aec8f38bb4 |
| institution | OA Journals |
| issn | 1873-2348 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Polymer Testing |
| spelling | doaj-art-4c0b6a1672a5492085fb15aec8f38bb42025-08-20T02:38:03ZengElsevierPolymer Testing1873-23482024-12-0114110865410.1016/j.polymertesting.2024.108654Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometryZhangyu Wu0Xianru He1Chunhua Zhu2Huaisong Yong3Xueyan Zhao4Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China; School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, ChinaSchool of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, ChinaInstitute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, ChinaSchool of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China; Department of Molecules & Materials, MESA+ Institute, University of Twente, 7500 AE, Enschede, the Netherlands; Institute Theory of Polymers, Leibniz-Institut für Polymerforschung Dresden e.V., D-01069, Dresden, Germany; Corresponding author.School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China.Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China; Corresponding author.Crystallinity is important to the properties of a semi-crystalline fluoropolymer, such as solubility, mechanical property, bonding strength, etc. This study extended the use of 19F Low-Field Nuclear Magnetic Resonance (19F LF-NMR) to the measurement of crystallinity in the semi-crystalline fluoropolymer F2314, which is the copolymer of vinylidene fluoride (VDF) and chlorotrifluoroethylene (CTFE) with a molar ratio of 1:4 and commonly used as binder in polymer-bonded explosives (PBXs). Based on the difference between spin-spin relaxometry of the 19F in crystalline region and in amorphous region, the crystallinity of F2314 can be qualitatively characterized. The obtained crystallinity exhibited a positive correlation to the time duration of thermal treatment, which is in consistent to the result of Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD). Moreover, 19F LF-NMR detected the slight decrease in segmental motion of crystalline region with the increase of crystallinity, and on-line monitored the evolution of segmental motion during heating. This study not only demonstrates the practicality and reliability of 19F LF-NMR in quantification of crystallinity, but also laid the foundation for in-situ characterization of fluoropolymers in PBXs in future work.http://www.sciencedirect.com/science/article/pii/S0142941824003313Low-field nuclear magnetic resonanceCrystallinityFluoropolymerSpin-spin relaxometry |
| spellingShingle | Zhangyu Wu Xianru He Chunhua Zhu Huaisong Yong Xueyan Zhao Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry Polymer Testing Low-field nuclear magnetic resonance Crystallinity Fluoropolymer Spin-spin relaxometry |
| title | Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry |
| title_full | Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry |
| title_fullStr | Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry |
| title_full_unstemmed | Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry |
| title_short | Quantitative characterization of crystallinity in semi-crystalline fluoropolymer through 19F LF-NMR relaxometry |
| title_sort | quantitative characterization of crystallinity in semi crystalline fluoropolymer through 19f lf nmr relaxometry |
| topic | Low-field nuclear magnetic resonance Crystallinity Fluoropolymer Spin-spin relaxometry |
| url | http://www.sciencedirect.com/science/article/pii/S0142941824003313 |
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