Phosphorus-containing liquid imide derivatives for enhancing fire safety, smoke suppression, UV shielding and mechanical properties of epoxy resins

Polymer Degradation and Stability, Journal Year: 2024, Volume and Issue: 229, P. 110941 - 110941

Published: Aug. 8, 2024

Language: Английский

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Full bio-based flame retardant towards multifunctional polylactic acid: Crystallization, flame retardant, antibacterial and enhanced mechanical properties

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 280, P. 135891 - 135891

Published: Sept. 21, 2024

Language: Английский

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Simple preparation, big effect: Chitosan-based flame retardant towards simultaneous enhancement of flame retardancy, antibacterial, crystallization and mechanical properties of PLA

International Journal of Biological Macromolecules, Journal Year: 2025, Volume and Issue: 303, P. 140668 - 140668

Published: Feb. 3, 2025

Language: Английский

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Properties and Mechanism of Flame Retardant Poly(Lactic Acid) Composites Containing Phosphaphenanthrene‐Hydroxyl Phenyl Maleimide Derivative

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

ABSTRACT A derivative based on 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide and maleimide units with terminal hydroxyl group (DH) was synthesized incorporated in poly(lactic acid) (PLA). The properties mechanism of PLA/DH composites were investigated. results showed that PLA under 10 wt% DH load achieved vertical combustion test (UL‐94) V‐0 rating an increased limiting oxygen index (LOI) 27.2% a 15.8% decrease peak heat release rate. prominent flame retardant efficiency attributed to its excellent inhibition diluting effects gaseous phase as well certain cross‐linked structure the condensed phase. Specifically, elongation at break PLA/DH‐7.5 by 17.6% comparison pure PLA. displayed enhanced interaction good compatibility PLA, thus endowing comprehensive performances As result, combination phosphaphenanthrene provides facile effective method improve retardancy mechanical

Language: Английский

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New tartrate and α-tocopherol based environmentally friendly plasticizers for improvement of the ductility of polylactic acid

Polymer, Journal Year: 2024, Volume and Issue: 308, P. 127361 - 127361

Published: July 5, 2024

This study focuses on developing environmentally friendly plasticized poly(lactide) (PLA) formulations using tartaric acid and α-tocopherol at 20 wt%. The extrusion injection molding processes demonstrated the industrial applicability of these plasticizers. Mechanical tests revealed positive results for tartrate-based plasticizers, with elongation break surpassing 220 %, while succinate achieved 170 %. However, acetate showed limited PLA plasticization. Field emission scanning electron microscopy confirmed plasticization in fractured surfaces. Thermal analysis indicated a reduction PLA's glass transition temperature (Tg) from 60 °C to around 30 underscoring tartrates' exceptional efficiency. cold crystallization (Tcc) decreased all samples due enhanced chain mobility. Thermomechanical dimensional shrinkage, dimethyl tartrate (DMT) causing less pronounced effects. Generally, tartrates yielded superior properties, attributed their lower molecular weight compared α-tocopherol-derived Notably, plasticizers employed are an eco-friendly approach improve processability enhancing ductile properties.

Language: Английский

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A Range of Sustainable Lignin-Derived Phosphonamides：Achieving The Between Crystallization, Mechanical Properties and Flame Retardancy of Biodegradable Polylactide

Published: Jan. 1, 2025

Against the background of practical application requirements and sustainable development, achieving an equilibrium between crystallization, mechanical properties flame retardancy polylactide (PLA) with a green strategy has been challenge. Additionally, previous work lacked to explore structure-activity relationship. Herein, four lignin-derived phosphonamides containing P-C P-O-C bonds were synthesized used fabricate PLA composites. The crystallization behaviors, composites systematically compared, influence structure on flame-retardant mechanism was emphasized. DSC results showed that these act as nucleating agents they significantly improved capacity PLA. Interestingly, are more effective than in accelerating rate, increasing nucleation density reducing crystal size. Beyond that, maintain outstanding properties, exhibited significant improvement. 6 wt% fulfilled UL-94 V-0 ratings enhanced LOI values. Phosphonamides endow higher efficiency, while enable Flame retardant analysis suggests primarily vapor phase, condensed phase. is realized by synergistic effects drop away, free radical trapping, dilutive influence, residual char. In summary, this research provides for fabrication overall performance, which exhibits broad prospect industry.

Language: Английский

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Thermal stability, flame retardancy and mechanical properties of casein-based rigid polyurethane foam with starch and sepiolite as fillers

International Journal of Polymer Analysis and Characterization, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 16

Published: Jan. 14, 2025

Casein-based rigid polyurethane foam (RPUF) with different ratios of starch and sepiolite were prepared by a one-step process. Thermogravimetric analysis, CONE scanning electron microscopy limiting oxygen index (LOI) vertical combustion mechanical property analysis used to explore the thermal stability, flame retardancy, compressive properties modified RPUFs, respectively. The results showed that initial decomposition temperature activation energy (E) RPUF-C5ST2SE3 (5 g casein, 2 starch, 3 sepiolite) highest. Under condition radiant flux 50 kW/m2, peak heat release rate (PHRR), total (THR), smoke production (PSPR), (TSR) reduced 35.92%, 10.83%, 36.67%, 18.20%, respectively, compared RPUF without retardant. By analyzing carbon residue, it was found had highest residue its morphology relatively intact. In addition, LOI UL-94 rating V-0. At same time, also best property. present experimental can provide useful reference for future retardant studies.

Language: Английский

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Designing Highly Flame-Retardant Wood Through an In Situ Chemical Modification Strategy

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

In order to improve the specimens' flame-retardant qualities, ethyl orthosilicate was impregnated into them using a combination of delignification process and in situ growing approach. Lignification has been demonstrated increase cellular gap specimen maximize impregnation orthosilicate. Moreover, growth method results specimens containing silica manufactured from orthosilicate, thereby forming composite material with enhanced properties. The examination changes properties before after modification conducted FTIR spectroscopy, XRD, XPS, SEM, other experimental techniques. modified exhibited higher comparison untreated specimens. Furthermore, mechanical properties, characterized by an augmented compressive strength 34.9 MPa strength-to-weight ratio 158 MPa·cm·g-1, that did not undergo process. experiments show proposed green technology provides new for producing composites could significantly qualities wood.

Language: Английский

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Cobalt/copper coordinated organic-inorganic hybrid fibrous phosphorus-nitrogen flame retardant: Simultaneously improving fire safety, deicing and mechanical properties for thermoplastic polyurethane

Composites Part B Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112292 - 112292

Published: Feb. 1, 2025

Language: Английский

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Micro-nano fibers with core-shell for enhancing flame retardancy and high-temperature resistance of biodegradable triboelectric materials

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110848 - 110848

Published: March 1, 2025

Language: Английский

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