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High-performance epoxy resin with flame-retardant, transparent, and ultraviolet shielding properties based on a
Baiyu Jiang1, Yuxiang Zhang2, Jia Gao3
1College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, PR China; Zhejiang Longsheng Chemical Research Institute Co., Ltd., Shaoxing 312300, PR China.
International Journal of Biological Macromolecules
|July 31, 2024
Summary
A novel bio-based flame retardant, MFR, was developed from vanillin and added to epoxy resins (EP). The resulting EP/MFR15 composite demonstrates excellent flame retardancy, enhanced mechanical strength, and UV shielding without compromising transparency.
Area of Science:
- Polymer Science
- Materials Science
- Organic Chemistry
Background:
- Flame-retardant epoxy resins (EP) are crucial for electronic applications but achieving toughness, transparency, UV shielding, and low dielectric properties simultaneously remains a challenge.
- Current flame retardants often compromise other desirable material properties.
Purpose of the Study:
- To synthesize a bio-based macromolecule flame retardant (MFR) from sustainable sources.
- To incorporate MFR into epoxy resins to create high-performance composites with multiple functionalities.
- To evaluate the flame retardancy, mechanical properties, UV shielding, and dielectric behavior of the modified epoxy resin.
Main Methods:
- Synthesis of a bio-based macromolecule (MFR) using vanillin, phenyl dichlorophosphate, 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO), and poly(propylene glycol) bis(2-aminopropyl ether).
- Addition of MFR to epoxy resin at varying concentrations, focusing on 15 wt% (EP/MFR15).
- Comprehensive characterization of EP/MFR15, including flame retardancy tests (UL-94, LOI), mechanical testing (tensile strength, toughness), UV-Vis spectroscopy, and dielectric measurements.
Main Results:
- EP/MFR15 achieved a UL-94 V-0 rating and an LOI of 29.2%, indicating excellent flame retardancy.
- Significant reductions in peak heat release rate (PHRR) by 59.5% and total heat release rate (THR) by 40.7% were observed.
- Tensile strength and toughness improved by 20.3% and 43.8%, respectively.
- The composite exhibited enhanced UV shielding and a low dielectric constant without sacrificing transparency.
Conclusions:
- The developed bio-based macromolecule (MFR) is an effective flame retardant for epoxy resins.
- MFR incorporation leads to significant improvements in flame retardancy, mechanical properties, and UV shielding.
- This study presents a promising strategy for creating sustainable, high-performance epoxy composites for demanding applications.
