Fast char formation induced by POSS confining Co-MOF hollow prisms in epoxy composites with mitigated heat and smoke hazards

Han, Zhengde; Zhang, Wenyuan; Song, Xiaoning; Vahabi, Henri; Pan, Ye-Tang; Zhang, Wenchao; Yang, Rongjie

doi:10.1016/j.cej.2023.145682

Cited by 33 publications

(3 citation statements)

References 44 publications

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“…In this study, POSS was homogeneously scattered in the PP matrix with good interfacial compatibility through an in situ polymerization process, which could effectively limit the evaporation process of POSS. POSS can also greatly improve the thermal stability of nanocomposites by forming a thermally stable siliceous or carbosiliceous surface layer (physical effect) that provides physical protection for the polymer matrix and limits pyrolysis processes. , Table S2 shows that the (degradation temperature at 5 wt % loss) T d5% and (decomposition temperature corresponding to maximum weight loss) T dmax of PP/POSS nanocomposites were higher than those of neat PP. The T dmax of PP/POSS nanocomposites (with a POSS content of only 0.63 wt %) rises up to 450.5 °C.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Yan,

Huang,

et al. 2024

ACS Appl. Polym. Mater.

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In this study, a polyhedral oligomeric silsesquioxane (POSS)-MgCl bisupported TiCl 4 catalyst was synthesized through the treatment of trisilanolisobutyl POSS with Grignard reagent, followed by anchoring TiCl 4 . The resulting catalyst could catalyze the propylene polymerization with very high activity after activation by a cocatalyst. Meanwhile, it is noteworthy that, as the cage structure of POSS contains a silicone ether structure, the isotactic index of the obtained polypropylene (PP) exceeds 90%, even in the absence of an electron donor. Additionally, because of the uniform dispersion of POSS in the PP matrix during polymerization and good interfacial compatibility, the obtained PP/POSS nanocomposites possess not only excellent thermal stability but also excellent mechanical properties. Therefore, a high-activity catalytic propylene stereoselective polymerization catalyst was developed and provided a feasible method for the fabrication of high-performance PP/POSS nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Yan,

Huang,

et al. 2024

ACS Appl. Polym. Mater.

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“…10(c)). The primary decomposition products encompassed water (3488 cm −1 ), hydrocarbons (2975 cm −1 ), carbon dioxide (2364 cm −1 ), carbonyl compounds (1777 cm −1 ), aromatic compounds (1509 cm −1 ) and ArO (1271 cm −1 ) 37 …”

Section: Resultsmentioning

confidence: 99%

Improving processability and mechanical properties of epoxy resins with biobased flame retardants

Gong,

Zhang,

et al. 2024

Polymer International

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Integrating flame retardant additives into epoxy resins is an essential strategy for improving their fire resistance. However, introducing flame retardant groups often compromises the processability and mechanical integrity of the resins. In this research, we synthesized a novel, bio‐based flame retardant, referred to as DPN, using naringenin and chlorodiphenylphosphine as precursors via a straightforward single‐step process. The addition of DPN dramatically decreased the viscosity of Hydantoin Epoxy Resin, from 7468 mPa·s to 1285 mPa·s. Furthermore, when cured with 4,4‐diaminodiphenylmethane (DDM), the composite containing 5 equivalents of DPN (DPN‐5) exhibited a remarkable improvement in mechanical strength, reaching 190 MPa, significantly outperforming the pure thermoset (DPN‐0: 104 MPa), while preserving high transparency. Combustion tests further confirmed that DPN significantly boosts the flame resistance of the thermoset, with DPN‐5 achieving a Limiting Oxygen Index (LOI) of 37% and securing a UL‐94 V‐0 rating. Cone calorimetry analysis showed that DPN‐5 effectively reduced heat and smoke production during combustion, achieving a 13.4% reduction in Peak Heat Release Rate and a 28.2% decrease in Total Heat Release compared to DPN‐0. This study underscores the potential of multifunctional bio‐based flame retardants derived from renewable resources in advancing the development of high‐performance materials.This article is protected by copyright. All rights reserved.

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“…The key scientific issue was accordingly to select a proper catalytic species with a suitable state for velocity-tailored catalysis. Distinct from nickel- and cobalt-based nanocatalysts, , an iron-based catalyst presented a more remarkable divergence with a coexisting catalytic decomposition and catalytic charring toward the epoxy matrix. , The decomposed products from the catalytic decomposition of epoxy provided a constituent fuel for a catalytic charring behavior toward a polyaromatic charring reaction. Aiming to accelerate the charring behavior, an iron-based nanocatalyst featured a relatively weaker catalytic decomposition and stronger catalytic charring was desirable.…”

Section: Introductionmentioning

confidence: 99%

Tailored Catalysis Inducing Exceptionally Fire-Safe and Mechanically Reinforced Epoxy at An Ultralow Loading

Bi,

Zhang,

et al. 2023

ACS Appl. Mater. Interfaces

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Fast char formation induced by POSS confining Co-MOF hollow prisms in epoxy composites with mitigated heat and smoke hazards

Cited by 33 publications

References 44 publications

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Improving processability and mechanical properties of epoxy resins with biobased flame retardants

Tailored Catalysis Inducing Exceptionally Fire-Safe and Mechanically Reinforced Epoxy at An Ultralow Loading

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