A Novel Schiff Base Epoxy: Synthesis, Degradability, and Application as a MultiPurpose Modifier for DGEBA/DDM DOI Open Access
Chenchen Gao,

Aitang Xing,

Zhiqi He

et al.

Journal of Polymer Science, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 16, 2024

ABSTRACT Simultaneously increasing mechanical strength, toughness, thermal stability, and flame retardancy of epoxy thermoset without compromising transparency is appealing but challenging. To address that goal, a Schiff base VDEP developed. The neat VDEP‐cured product, 100wt% , not only shows comparable strength to conventional also can be degraded in 10% H 2 SO 4 /THF/H O solution 24 h, showing great degradability under mild conditions. More importantly, proper addition simultaneously increases the tensile impact T g d5% char residue, UV shielding cured epoxies while providing self‐extinguishing ability. All those enhancements are achieved deteriorating transparency. When 15 wt% added, reaches 91.07 MPa, with 36.7% increase; 40.73 kJ m −2 33.8% increase. enhancement due reinforcing effect intermolecular interaction compacted network caused by free volume reduction. higher toughness results from greater mobility chain segments, reduced crosslinking density energy dissipative interaction. rigid two benzene‐conjugated structure abundant hydrogen bonding contribute . Therefore, this work provides degradable high‐performance based on it.

Language: Английский

Polymers as Aerospace Structural Components: How to Reach Sustainability? DOI Creative Commons
William E. Dyer, Barış Kumru

Macromolecular Chemistry and Physics, Journal Year: 2023, Volume and Issue: 224(24)

Published: Sept. 25, 2023

Abstract The aerospace industry has been benefiting from the utilization of polymer materials since fiber‐reinforced composites (FRPC) offer high performances at low densities compared to metals. FRPC facilitated design lightweight materials, which is extensively used in aviation today. Since their first integration into structural parts, experienced exponential growth over years and received a special interest manufacturing engineering. While today major focus engineering, matrix relies on chemistry. However, aircraft are facing pressing issue related sustainability, environmental footprint an alarming level. In this review, commercial thermosetting employed structures exhibited chemistry perspective by depicting starting products curing reactions. potential help next‐generation sustainable for parts means feedstock, energy‐efficient processing, recycling, disseminated.

Language: Английский

Citations

26
Bio-based epoxy vitrimer with inherent excellent flame retardance and recyclability via molecular design DOI

Meihui Zhou,

Xiang Ao, Monsur Islam

et al.

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 262, P. 129363 - 129363

Published: Jan. 18, 2024

Language: Английский

Citations

14
Flame-retardant epoxy thermosets derived from renewable resources: Research development and future perspectives DOI Creative Commons
Yao Yuan,

Wei-Liang Lin,

Yi Xiao

et al.

Journal of Material Science and Technology, Journal Year: 2024, Volume and Issue: 195, P. 29 - 40

Published: Feb. 29, 2024

Nowadays, the predominant source for approximately 90% of epoxy resin materials worldwide is diglycidyl ether bisphenol A (DGEBA). However, increasing recognition environmental concerns, such as global warming and depletion petroleum reserves, necessitates exploration alternative options, specifically bio-epoxy derived from sustainable resources. Nonetheless, inadequate flame retardancy presents a notable drawback, limiting its applicability in high-risk environments. The objective this review article to provide concise overview latest up-to-date advances flame-retardant resins sources. Firstly, discussion encompasses inherently bio-based resins, considering both monomers curing agents, focusing on their mechanical properties. Furthermore, utilization phosphorus-containing silicon-containing additives explored. Additionally, comprehensive evaluation partially intrinsically retardant provided. Finally, offers an extensive survey current state-of-the-art field future perspectives, serving valuable resource researchers engaged study

Language: Английский

Citations

13
A bio-based antibacterial epoxy resin coating with outstanding flame retardant and mechanical properties DOI

Jiajin Cai,

Xuanrui Zhang, Zhimin Wang

et al.

Progress in Organic Coatings, Journal Year: 2024, Volume and Issue: 190, P. 108369 - 108369

Published: March 14, 2024

Language: Английский

Citations

9
Flame retardancy and mechanical properties of epoxy resin with the phytic acid‐derived flame retardant DOI Open Access
Song Wang, Lingchen Meng, Qi Chen

et al.

Journal of Applied Polymer Science, Journal Year: 2023, Volume and Issue: 140(44)

Published: Aug. 21, 2023

Abstract The synthesis and application of the bio‐derived flame retardant can meet current requirements for high‐efficient sustainable development retardants. Therefore, using phytic acid (PA), 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO), piperazine as raw materials, a PA‐derived (PAPDOPO) was prepared. Fourier transform infrared spectroscopy x‐ray diffraction techniques were applied to characterize structure PAPDOPO. In prepared flame‐retardant epoxy resin (FEP), PAPDOPO showed high retardancy. When 4% added into (EP), FEP (EP‐PAPD‐4) passed V‐0 level in UL‐94 test, limited oxygen index value EP‐PAPD‐4 reached 35.3%. Microcombustion calorimetry test also demonstrate performance peak heat release rate reduced by 30.4% compared with that pure EP. Due low addition amount FEP, mechanical properties hardly decreased

Language: Английский

Citations

15
Flame retardancy, thermal behavior and mechanical properties of an epoxy resin and cyanate ester resin copolymer containing a bio phytate-based flame retardant DOI

Xinhao Cen,

Zhilin Cao, Zhengzhou Wang

et al.

Polymer, Journal Year: 2023, Volume and Issue: 291, P. 126610 - 126610

Published: Dec. 19, 2023

Language: Английский

Citations

11
Intrinsic flame-retardant epoxy resin composite containing schiff base structure with satisfied flame retardancy and mechanical properties DOI Creative Commons
Maoyong Zhi, Xiong Yang, Bing‐Jian Su

et al.

Polymer Testing, Journal Year: 2024, Volume and Issue: 134, P. 108437 - 108437

Published: April 26, 2024

To solve the non-renewable and flammability of traditional epoxy composites, a new type intrinsic flame-retardant (VH/GF) composite was fabricated from vanillin-based resin (VH) glass fibre (GF). The T5% VH/GF higher than that DGEBA/GF, CY800 reached above 84 wt.%. obtained limiting oxygen index as high 90% passed UL-94 V-0 rating. Compared with total heat release, smoke production, maximal density reduced by more 72%, 91% 81%, respectively. physical barrier excellent char formation ability VH endowed good condensed phase effect. When mass ratio matrix 5:5, storage modulus transition temperature were 6.34 GPa 205 °C, its tensile strength elongation at break 348.36 MPa 4.01%. This work provides research insights for bio-based in high-performance fire safety composites.

Language: Английский

Citations

4
Microphase Separation Transformation in Bio-Based Benzoxazine/Phenolic/PEO-b-PCL Diblock Copolymer Mixtures Induced by Transesterification Reaction DOI Creative Commons

Yang‐Chin Kao,

Yi-Cheng Ku,

Mohamed Gamal Mohamed

et al.

Macromolecules, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Herein, we synthesized a difunctionalized bio-based vanillin azine monomer (4,4′-((1E,1′E)-hydrazine-1,2-diylidenebis(methaneylylidene))bis(2-methoxyphenol), VBAZ-2OH) via Schiff base reaction between and hydrazine monohydride. Subsequently, successfully prepared 2,2′-(((1E,1′E)-hydrazine-1,2-diylidenebis(methaneylylidene))bis(8-methoxy-2H-benzo[e][1,3]oxazine-6,3(4H)-diyl))bis(ethan-1-ol), VBAZ-BZ-2OH), which contains oxazine units, through Mannich condensation of VBAZ-2OH with ethanolamine paraformaldehyde in 1,4-dioxane as the solvent. The chemical structures these two monomers (VBAZ-2OH VBAZ-BZ-2OH) were characterized by using NMR FTIR analyses. Our study aimed to investigate transesterification reactions blending different VBAZ-BZ-2OH/phenolic resin (BP) compositions PEO112-b-PCL99 (EC) diblock copolymer form various BP/EC blends. These blends exhibit competitive hydrogen-bonding interaction phenomena, analyzed one-dimensional two-dimensional Interestingly, after thermal treatment at 150 °C, ordered self-assembled lamellae or hexagonal packed cylinder transform into disordered micelle disorder structure result due EC becoming miscible VBAZ-BZ-2OH monomer, disrupting structure, was confirmed TEM SAXS could easily understand order–disorder morphological transformation replace thermogravimetric analysis (TGA) coupled microcomputed gas chromatography (TGA-GC)

Language: Английский

Citations

4
Synthesis and Properties of Dopo-Based Biphenyl-Isosorbide Flame Retardant Epoxy Resin DOI
Yubin Xie, Xiaoqing Zhang, Jiarong Chen

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
A P/N synergistic flame retardant containing flexible nitrile group for enhancing the mechanical properties and fire safety of epoxy resins DOI
Junwei Li, Qiuju Ma, Quanyi Liu

et al.

Journal of Applied Polymer Science, Journal Year: 2023, Volume and Issue: 141(4)

Published: Oct. 31, 2023

Abstract To further enhance the fire safety of epoxy resins, a phosphorus–nitrogen synergistic flame retardant (DPVHD) with flexible chain segment and nitrile group was synthesized. In addition to traditional elements P N, retardancy composites is enhanced by cross‐linking effect groups introduced form an interpenetrating network matrix. The results showed that sample 10 wt% DPVHD‐10/EP had LOI 32.3% passed UL‐94 V‐0 rating, PHRR THR reduced 15.4% 47%, respectively, compared pure EP. It worth noting introduction segments improves flexural properties resin Compared epoxy, epoxy‐cured compounds DPVHD show rising trend increase flame‐retardant additive. And rise reaches 33.6%, which greatly reduces negative additives on mechanical This work therefore provides new ideas for exploiting advantages phosphorus‐nitrogen synergy nitrile‐based in resins.

Language: Английский

Citations

10