Enabling simultaneous reprocessability and fire protection via incorporation of phosphine oxide monomer in epoxy vitrimer

Zhenyu Huang ¹Wenyu Wu Klingler ²Daniele Roncucci ²Carolina Polisi ²Valentin Rougier ³Sandro Lehner ²Milijana Jovic ²Daniel Rentsch ⁴Sithiprumnea Dul ²Karin Brändli Hedlund ⁵Véronique Michaud ³Zhengzhou Wang ⁶Sabyasachi Gaan²

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作者信息

1. Department of Polymeric Materials,School of Materials Science and Engineering,Tongji University,Shanghai,201804,China;Laboratory for Advanced Fibers,Empa Swiss Federal Laboratories for Materials Science and Technology,Lerchenfeldstrasse 5,St.Gallen,9014,Switzerland
2. Laboratory for Advanced Fibers,Empa Swiss Federal Laboratories for Materials Science and Technology,Lerchenfeldstrasse 5,St.Gallen,9014,Switzerland
3. Laboratory for Processing of Advanced Composites(LPAC),Ecole Polytechnique Fédérale de Lausanne(EPFL),1015 Lausanne,Switzerland
4. Laboratory for Functional Polymers,Empa Swiss Federal Laboratories for Materials Science and Technology,Überlandstrasse 129,8600 Diibendorf,Switzerland
5. Institute for Materials technology and plastics processing,OST-Eastern Switzerland University of Applied Sciences,8640 Rapperswil,Switzerland
6. Department of Polymeric Materials,School of Materials Science and Engineering,Tongji University,Shanghai,201804,China;Key Laboratory of Advanced Civil Engineering Materials,Tongji University,Shanghai,201804,China
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Abstract

The conception of epoxy thermosets with both reprocessability and flame retardancy delineates a new horizon in polymer science,offering a material solution that is not only superior in fire safety but is also environment friendly.Herein,a flame-retardant epoxy vitrimer(EV)was prepared using partially bio-based IADPPO(diphenylphosphine oxide itaconic anhydride)and citric acid as curing reagents via a solvent-free process.Their incorporation created covalent adaptable networks(CANs)in the matrix which promote reprocessability and recyclability.The EV exhibits excellent thermal stability with high initial decomposition temperature(T.5wt％～308 ℃)and high glass transition temperature(Tg～107 ℃),similar to the blank EV(115 ℃).The flame retardancy,mechanical properties,transesterification-based repro-cessability,and flame-retardant mechanism were investigated.The EV containing 3 wt％phosphorus(EV IADPPO 3P)achieved UL-94 V0 classification with a limiting oxygen index(LOI)of 27％,while the virgin sample Blank EV(without phosphorus)burned completely.Additionally,increased flexural strength of 79％was observed for EV IADPPO 3P compared to Blank EV.Furthermore,the flame-retardant EV showed high malleability and reparability that could be thermomechanically reprocessed without sacrificing the thermal,mechanical,and flame-retardant properties.Thus,the newly developed epoxy vitrimer is not only fire-safe but fulfills the sustainability goals of today's society.

Key words

Epoxy vitrimer/Covalent adaptable networks/Flame retardancy/Reparable and reprocessable/Bio-based thermoset

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基金项目

Swiss National science Foundation(200021L_196923)

Zürcher Stiftung für Textilforschung(Winterthur,Switzerland)()

China Scholarship Council(202006260103)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量66

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