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Journal of Polymer Research

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01.04.2024 | Original Paper

Preparation of oxidized polyethylene wax from polyethylene wax by SCCO₂-assisted foam method: structural characteristics, reaction mechanism and properties

verfasst von: Wen-Huan Qiao, Peng Gao, Shao-Kang Qian, Zhen-Yan Hu, Shuang Ji, Jun-Yang Yan, Gui-Ping Cao

Erschienen in: Journal of Polymer Research | Ausgabe 4/2024

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Abstract

Polyethylene wax (PEW) serves as a versatile material modifier, and the newly acquired polarity functions after functionalization are of great interest. Furthermore, exploring methods to enhance product purity further is necessary. The rate of reaction between oxygen and PEW depends on both the diffusion rate of oxygen in the polymer and the thermodynamic properties of the reaction. To address these challenges and investigate changes in reaction mechanisms and properties, we employed supercritical carbon dioxide foaming to facilitate PEW oxidation while utilizing DFT theory to calculate oxidation reaction pathways and thermodynamic properties. The acid value of foamed PEW at 16 MPa and 115 °C increased by a factor of 2.7 compared to non-foamed PEW after 6 h of oxidation, indicating that foaming acted as an aid during this process. The generation of −OH, C = O, −CHO, and −COOH during the oxidation process was mutually confirmed through comprehensive analysis including FTIR, NMR spectroscopy, as well as other characterizations and calculations. Oxidized PEW (OPE) exhibited a maximum reduction in water contact angle (WCA) by 49°, a maximum decrease in crystallinity by 26.32%, and an increase in water vapour permeability by 61.8%. As a compatibilizer at a dosage level of 2.5 wt%, OPE demonstrated optimal compatibility improvement. Overall, foaming techniques effectively assisted the oxidation process, offering new possibilities for optimizing the structure and properties of PEW with potential applications within materials science.

Vorheriger Artikel Synergistic evolution of stable bioactivity and better mechanical strength in polyvinyl alcohol and sweet lime peel film

Nächster Artikel PVDF crystalline phases revisited: a first-principles computational study using the PBE-D3 functional

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Titel: Preparation of oxidized polyethylene wax from polyethylene wax by SCCO2-assisted foam method: structural characteristics, reaction mechanism and properties
verfasst von: Wen-Huan Qiao
Peng Gao
Shao-Kang Qian
Zhen-Yan Hu
Shuang Ji
Jun-Yang Yan
Gui-Ping Cao
Publikationsdatum: 01.04.2024
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 4/2024
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-024-03959-9

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