用19F LF-NMR弛豫法定量表征半结晶含氟聚合物的结晶度

IF 5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Zhangyu Wu , Xianru He , Chunhua Zhu , Huaisong Yong , Xueyan Zhao
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引用次数: 0

摘要

结晶度对半结晶含氟聚合物的溶解度、机械性能、结合强度等性能有重要影响。本研究将19F低场核磁共振(19F LF-NMR)的应用扩展到半结晶含氟聚合物F2314的结晶度测量。F2314是偏氟乙烯(VDF)与三氟氯乙烯(CTFE)的共聚物,摩尔比为1:4,常用作聚合物粘结炸药(PBXs)的粘结剂。利用19F在结晶区和非晶区自旋弛豫测量的差异,可以定性表征F2314的结晶度。所得结晶度与热处理时间呈正相关,这与差示扫描量热法(DSC)和x射线衍射(XRD)的结果一致。此外,19F LF-NMR检测到晶体区域的节段运动随结晶度的增加而略有下降,并在线监测了加热过程中节段运动的演变。本研究不仅证明了19F LF-NMR在定量结晶度方面的实用性和可靠性,也为今后在PBXs中进行含氟聚合物的原位表征奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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 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.
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来源期刊
Polymer Testing
Polymer Testing 工程技术-材料科学:表征与测试
CiteScore
10.70
自引率
5.90%
发文量
328
审稿时长
44 days
期刊介绍: Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.
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