Poly(ethylene-co-methacrylic acid) ionomer dynamic phase composition and polymer chain mobility characterization by time domain NMR

IF 1.6 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization Pub Date : 2025-10-03 DOI:10.1080/1023666X.2025.2462057

Chen Zheng , Yifan Xu , Zheng Zhang , Qiangqiang Yan , Amy Song , Xiaohua Qiu , Nathan Rau , Ray Drumright

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引用次数: 0

Abstract

We report a convenient approach for characterizing poly(ethylene-co-methacrylic acid) (EMAA) using time domain NMR. The T₂ relaxation curve of EMAA can be obtained by the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence and analyzed with a three-component model. The dynamic phase distribution (the aggregation of relaxation components with similar mobility) and overall polymer chain mobility results showed good agreement with well-known EMAA ionomer properties and Hahn Echo pulse sequence experiments. Subsequently, plasticizer's impact on the EMAA network was studied with the method established here. Plasticizer-induced dynamic phase redistribution and chain mobility changes can be revealed by time domain NMR (TD NMR) analysis, enabling researchers to better understand the plasticizer–polymer interaction mechanism. In conclusion, TD NMR characterization of EMAA polymers provided a new perspective on the structural features and dynamics of these materials. The method has the potential to be adopted in R&D labs, processing labs, or plant quality assurance/quality control.

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聚乙烯-共甲基丙烯酸离聚体动态相组成及聚合物链迁移率的时域核磁共振表征

我们报道了一种用时域核磁共振表征聚乙烯-共甲基丙烯酸（EMAA）的简便方法。通过carr - purcell - meiboomm - gill （CPMG）脉冲序列得到EMAA的T2弛豫曲线，并采用三分量模型进行分析。动态相分布（具有相似迁移率的弛豫组分聚集）和聚合物整体链迁移率结果与已知的EMAA离聚体性质和Hahn Echo脉冲序列实验结果吻合良好。随后，用本文建立的方法研究了增塑剂对EMAA网络的影响。通过时域核磁共振（TD NMR）分析可以揭示增塑剂诱导的动态相重分布和链迁移率变化，使研究人员能够更好地了解增塑剂与聚合物的相互作用机理。总之，EMAA聚合物的TD NMR表征为这些材料的结构特征和动力学提供了新的视角。该方法有可能在研发实验室、加工实验室或工厂质量保证/质量控制中采用。

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来源期刊

International Journal of Polymer Analysis and Characterization 化学-高分子科学

CiteScore

3.50

自引率

5.30%

发文量

审稿时长

1.6 months

期刊介绍： The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.