Stretch-Induced Structure Evolution of Poly(vinyl alcohol)–Glycerol Gel Films: An In Situ Synchrotron Radiation X-ray Scattering Study

IF 5.2 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2025-06-25 DOI:10.1021/acs.macromol.5c00354

Zheng Huang, Wenyi Li, Caixia Wan, Liguang Xu, Zhengli Xu, Dongmin Jia, Mengyu Xie, Yifan Jia, Jungen Chen* and Liangbin Li*,

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Abstract

High-temperature stretching is a potential approach for the industrial-scale fabrication of poly(vinyl alcohol) (PVA) nanofibril films. In this study, in situ small-angle X-ray scattering (SAXS)/wide-angle X-ray scattering (WAXS) are employed to investigate the structural evolution of PVA gel films containing glycerol during stretching at different temperatures. The SAXS and WAXS analyses reveal that uniaxial stretching triggers the melting–recrystallization of PVA lamellar crystals and the formation of nanofibrils. The key factors for structural evolution will change with the stretching temperature. When stretched at low temperatures, the destruction of crystals is dominated by stress. The reconstructed nanofibrils withstand the stress and cause feedback on the structural evolution, slowing the crystal destruction. At high temperatures, crystal destruction is dominated by melting, and the crystallinity decreases rapidly under stress, while stretch-induced recrystallization and reconstruction of nanofibrils are more readily achieved. Besides, the long period of lamellar crystals and nanofibrils increases with the increase of stretching temperature. The PVA porous nanofibril films with favorable nanofiber networks and porous structures can be obtained by biaxial stretching followed by solvent extraction and drying.

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拉伸诱导的聚乙烯醇-甘油凝胶膜结构演化：原位同步辐射x射线散射研究

高温拉伸是工业规模制备聚乙烯醇（PVA）纳米纤维薄膜的一种潜在方法。本研究采用原位小角x射线散射(SAXS)/广角x射线散射（WAXS）研究了含甘油的PVA凝胶膜在不同温度下拉伸过程中的结构演变。SAXS和WAXS分析表明，单轴拉伸触发了PVA片层晶体的熔化-再结晶和纳米原纤维的形成。结构演化的关键因素会随着拉伸温度的变化而变化。在低温下拉伸时，晶体的破坏主要是由应力引起的。重建的纳米原纤维可以承受应力，并对结构演变产生反馈，减缓晶体破坏。在高温下，晶体破坏以熔融为主，在应力作用下结晶度迅速下降，而拉伸诱导的纳米原纤维的再结晶和重建更容易实现。此外，随着拉伸温度的升高，片层晶体和纳米原纤维的长周期增加。通过双轴拉伸、溶剂萃取和干燥，可以得到具有良好纳米纤维网络和多孔结构的PVA多孔纳米纤维薄膜。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.