Preparation and properties of flame-retardant viscose fiber modified with poly[bis(methoxyethoxy)phosphazene]

He, Yongfeng; Cheng, Yuan; Zheng, Qiang; Zheng, Jinqu; Chen, Sheng

doi:10.1007/s12221-015-1005-x

Cited by 21 publications

(2 citation statements)

References 16 publications

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“…That is why the PDPP particles can play an important role in the flame retardation of gas phase during combustion. Additionally, PDPP particles can release HPO, PO 2 ·, C 6 H 4 O, which can combine with H· and HO· free radicals known as the main reactants in the thermal oxidation chain reaction, and finally inhibiting the combustion reactions of polymers in the gas phase [ 58 ]. Finally, the melt strength of PP matrix was greatly improved by PET nanofibrils, which resulted in a significant reduction of flameless droplets in water samples during combustion [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

In Situ Nanofibrillar Polypropylene-Based Composite Microcellular Foams with Enhanced Mechanical and Flame-Retardant Performances

et al. 2023

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With the increasing demand for plastic components, the development of lightweight, high strength and functionalized polypropylene (PP) from a cost-effective and environmentally friendly process is critical for resource conservation. In situ fibrillation (INF) and supercritical CO2 (scCO2) foaming technology were combined in this work to fabricate PP foams. Polyethylene terephthalate (PET) and poly(diaryloxyphosphazene)(PDPP) particles were applied to fabricate in situ fibrillated PP/PET/PDPP composite foams with enhanced mechanical properties and favorable flame-retardant performance. The existence of PET nanofibrils with a diameter of 270 nm were uniformly dispersed in PP matrix and served multiple roles by tuning melt viscoelasticity for improving microcellular foaming behavior, enhancing crystallization of PP matrix and contributing to improving the uniformity of PDPP’s dispersion in INF composite. Compared to pure PP foam, PP/PET(F)/PDPP foam exhibited refined cellular structures, thus the cell size of PP/PET(F)/PDPP foam was decreased from 69 to 23 μm, and the cell density increased from 5.4 × 106 to 1.8 × 108 cells/cm3. Furthermore, PP/PET(F)/PDPP foam showed remarkable mechanical properties, including a 975% increase in compressive stress, which was attributed to the physical entangled PET nanofibrils and refined cellular structure. Moreover, the presence of PET nanofibrils also improved the intrinsic flame-retardant nature of PDPP. The synergistical effect of the PET nanofibrillar network and low loading of PDPP additives inhibited the combustion process. These gathered advantages of PP/PET(F)/PDPP foam make it promising for lightweight, strong, and fire-retardant polymeric foams.

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Section: Resultsmentioning

confidence: 99%

In Situ Nanofibrillar Polypropylene-Based Composite Microcellular Foams with Enhanced Mechanical and Flame-Retardant Performances

et al. 2023

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“…The six active chlorine atoms in HCCP could be replaced and then introduced a number of functional groups into HCCP. Poly[bis(methoxyethoxy)phosphazene] (PMEP) has been synthesized and used to improve the flame retardancy of viscose fiber via blending wet spinning method by He . Combustibility properties showed that the limiting oxygen index (LOI) value of viscose fiber containing only 10 wt% PMEP could reach up to 28%, and that of the sample containing 20 wt% PMEP was as high as 35%.…”

Section: Introductionmentioning

confidence: 99%

Intercalated montmorillonite by cyclotriphosphazene imidazole derivative and its thermal properties used in polyester

Wang

Chen

et al. 2016

Fire and Materials

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Summary Montmorillonite (MMT) and hexachlorocyclotriphosphazene (HCCP) are two focal materials to investigate in improving the thermal properties of polymer in recent years. They are used to improve the thermal performance of polymer from different aspects. MMT usually could play an important role in preventing or slowing down the penetration of heat and flame by layers of the mineral. However, making polymer dehydrate and carbonize and generating incombustible ammonia, which can dilute the concentration of combustible gas, are the major ways from HCCP. In this study, a novel intercalated MMT containing high content of phosphorus and nitrogen was synthesized by MMT and HCCP (HCCP‐in‐MMT). It was applied to improve the thermal performance of polyethylene terephthalate (PET) polymer. 1H NMR and 31P NMR technology were used to track the structures of a series of intermediates. The composites were prepared by melt‐blending neat PET with HCCP‐in‐MMT and named as PET/HCCP‐in‐MMT material. Three levels of HCCP‐in‐MMT (1, 3, and 5 wt%) were considered for the blends. The preliminary application in improving the thermal performance of PET was studied by thermo‐gravimetric (TG) analysis and pyrolysis–gas chromatography–mass spectrometry; pyrolysis–gas chromatography–mass spectrometry study showed that the introduction of HCCP‐in‐MMT would inhibit the pyrolysis of PET during heating or burning. The flame retardancy performance of PET composites was characterized by limiting oxygen index tests and UL‐94 test. The result showed that the composites could pass UL‐94 V‐1 and limiting oxygen index value 28.3% just only containing 5 wt% of HCCP‐in‐MMT. TEM showed that the inserted layer structure was formed between PET matrix and synthetic flame retardant HCCP‐in‐MMT. Copyright © 2016 John Wiley & Sons, Ltd.

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Preparation and properties of toughened/flame‐retardant PA6/glass‐fiber composites reinforced by linear polyphosphazene elastomers

Zou,

Luo,

et al. 2024

Polymer Composites

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In this study, the challenges of brittleness and flammability in Polyamide 6/glass fiber (PA6/GF) composites, which are crucial for heat‐resistant and stress‐bearing structural parts, are addressed. Polyphosphazene (PZ) elastomers, known for their exceptional flame‐retardant properties, are introduced to enhance the robustness and safety of these composites. Specifically, poly(diaryloxy)phosphazene (PDAP) and poly(difluoroalkoxy)phosphazene (PDFP) are utilized, both contributing to the improved toughness and flame resistance of the PA6/GF composites. Experimental results show that PDAP mainly played the role of solid‐phase flame retardant, while PDFP mainly acted the role of gas‐phase flame retardant. For PA/PZs composites without adding GF, PDFP plays a more efficient flame retardant effect than PDAP. By introducing 15 Vol% of PDFP, the limiting oxygen index (LOI) of the composite reached 26.1%, while the notched impact strength increased by 297%. For PA/PZs/GF composites, PDAP plays a better flame retardant role than PDFP. Under the action of 30 vol% GF and 15 vol% PDAP, the LOI of PA6/PDAP/GF composite reached 26.8%, and the notch impact strength improved to 18.7 kJ/m2, which is 165% higher than that of PA6/GF, and the UL‐94 test reaches V‐0 level. The findings of the study highlight the potential of PDAP and PDFP to act as dual‐function modifiers. These modifiers can considerably ameliorate both the impact resistance and flame retardancy of PA6 and PA6/GF composites. Such dual enhancement surpasses the typical trade‐offs seen in conventional composites, indicating a constructive direction for future material innovation.Highlights Polyphosphazenes simultaneously enhance PA6's toughness & flame resistance. Distinct flame retardant mechanisms found in PDAP and PDFP. GF presence alters PDAP and PDFP's flame retardant efficacy. PDAP shows superior flame resistance in GF‐reinforced PA6 composites. Without GF, PDFP outperforms PDAP in enhancing flame retardancy.

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Preparation and properties of flame-retardant viscose fiber modified with poly[bis(methoxyethoxy)phosphazene]

Cited by 21 publications

References 16 publications

In Situ Nanofibrillar Polypropylene-Based Composite Microcellular Foams with Enhanced Mechanical and Flame-Retardant Performances

In Situ Nanofibrillar Polypropylene-Based Composite Microcellular Foams with Enhanced Mechanical and Flame-Retardant Performances

Intercalated montmorillonite by cyclotriphosphazene imidazole derivative and its thermal properties used in polyester

Preparation and properties of toughened/flame‐retardant PA6/glass‐fiber composites reinforced by linear polyphosphazene elastomers

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