Controllable micro cross-linking towards multifunctional flame-retardant aliphatic polyamide

Zhang, Qin; Zhu, Guorui; Xiao, Xiang-Xin; Liu, Qingsong; Jiang, Min; Guo, De‐Ming; Zhao, Haibo; Li, Wen-Da; Chen, Li; Liu, Bowen; Wang, Yu‐Zhong

doi:10.1016/j.cej.2023.144983

Cited by 12 publications

(2 citation statements)

References 66 publications

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“…52 The gaseous products during the decomposition process were characterized by using thermogravimetric analysis-infrared spectrometry (TG-IR). The 3D TG-IR diagrams (Figure 5e−h) showed that the main pyrolyzation products encompassed H 2 O (3570 cm −1 ), CO 2 (2357 cm −1 ), 53 carbonyl compounds (1747 cm −1 ), 8 and ether compounds (1108 cm −1 ). 32 After coating, the absorbance intensity of H 2 O and CO 2 evidently decreased, indicating that the CS coating was invalid in releasing inflammable gases for diluting combustible substances (Figure S13).…”

Section: Thermal Stability and Universal Flame-retardant Performancementioning

confidence: 99%

Biomimetic Nanoporous Transparent Universal Fire-Resistant Coatings

Zhang,

et al. 2024

ACS Appl. Mater. Interfaces

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The inherent flammability of most polymeric materials poses a significant fire hazard, leading to substantial property damage and loss of life. A universal flame-retardant protective coating is considered as a promising strategy to mitigate such risks; however, simultaneously achieving high transparency of the coatings remains a great challenge. Here, inspired by the moth eye effect, we designed a nanoporous structure into a protective coating that leverages a hydrophilic−hydrophobic interactive assembly facilitated by phosphoric acid protonated amino siloxane. The coating demonstrates robust adhesion to a diverse range of substrates, including but not limited to fabrics, foams, paper, and wood. As expected, its moth-eyeinspired nanoporous structure conferred a high visible light transparency of >97% and water vapor transmittance of 96%. The synergistic effect among phosphorus (P), nitrogen (N), and silicon (Si) largely enhanced the charforming ability and restricted the decomposition of the coated substrates, which successfully endowed the coating with high fire-fighting performance. More importantly, for both flexible and rigid substrates, the coated samples all possessed great mechanical properties. This work provides a new insight for the design of protective coatings, particularly focusing on achieving high transparency.

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Section: Thermal Stability and Universal Flame-retardant Performancementioning

confidence: 99%

Biomimetic Nanoporous Transparent Universal Fire-Resistant Coatings

Zhang,

et al. 2024

ACS Appl. Mater. Interfaces

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“…Polyamides are characterized by their polar polymer nature, featuring a substantial number of amide groups (–CONH–) within their molecular structure. These amide groups possess a dipole moment of 3.7 Debye, contributing to their outstanding dielectric properties. − Furthermore, polyamides exhibited noteworthy mechanical strength and resistance to abrasion, maintaining stable characteristics even at elevated temperatures. , This thermal stability rendered them suitable for application in electronic devices operating in high-temperature environments. Consequently, polyamides demonstrated considerable potential as dielectric polymers.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Bond-Free Piperazine Polyamides with Ultralow Dielectric Loss

Yang,

Zeng,

Yuan

et al. 2024

Ind. Eng. Chem. Res.

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Polyamide, as a polar polymer, possesses a large intrinsic dipole moment and excellent mechanical properties, making it a highly promising dielectric material. Nevertheless, the dipoles in traditional polyamides are constrained by hydrogen bonding, resulting in a diminished capacity for dielectric polarization and significant dielectric losses. In this study, traditional diamine was replaced with piperazine to fabricate a hydrogen-bond-free polyamide by employing structural design, which alleviated the limitation of hydrogen bonding on dipole polarization and considerably reduced the dielectric loss of the polyamide. The results demonstrated that the piperazine-12 polyamide prepared with piperazine and adipic acid exhibited a low dielectric loss of 0.0027 at 10 3 Hz, a dielectric constant of 4.38 at 10 3 Hz, and a breakdown strength exceeding 149 MV/m. The approach outlined in this paper offers an effective method for designing and improving the dielectric performance of polyamides. This piperazine polyamide is expected to be an emerging organic dielectric material for applications in thin-film capacitor volumes.

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Ultrahigh Heat/Fire‐Resistant, Mechanically Robust, and Closed‐Loop Chemical Recyclable Polycarbonate Enabled by Facile Bond Dissociation Energy Modulation

Xiao,

Zhang,

Bai

et al. 2024

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Plastics serve as an essential foundation in contemporary society. Nevertheless, meeting the rigorous performance demands in advanced applications and addressing their end‐of‐life disposal are two critical challenges that persist. Here, an innovative and facile method is introduced for the design and scalable production of polycarbonate, a key engineering plastic, simultaneously achieving high performance and closed‐loop chemical recyclability. The bisphenol framework of polycarbonate is strategically adjusted from the low‐bond‐dissociation‐energy bisphenol A to high‐bond‐dissociation‐energy 4,4′‐dihydroxydiphenyl, in combination with the incorporation of polysiloxane segments. As expected, the enhanced bond dissociation energy endows the polycarbonate with an extremely high glow‐wire flammability index surpassing 1025 °C, a 0.8 mm UL‐94 V‐0 rating, a high LOI value of 39.2%, and more than 50% reduction of heat and smoke release. Furthermore, the π‐π stacking interactions within biphenyl structures resulted in a significant enhancement of mechanical strength by as more as 37.7%, and also played a positive role in achieving a lower dielectric constant. Significantly, the copolymer exhibited outstanding closed‐loop chemical recyclability, allowing for facile depolymerization into bisphenol monomers and the repolymerized copolymer retains its high heat and fire resistance. This work provides a novel insight in the design of high‐performance and closed‐loop chemical recyclable polymeric materials.

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Controllable micro cross-linking towards multifunctional flame-retardant aliphatic polyamide

Cited by 12 publications

References 66 publications

Biomimetic Nanoporous Transparent Universal Fire-Resistant Coatings

Biomimetic Nanoporous Transparent Universal Fire-Resistant Coatings

Hydrogen-Bond-Free Piperazine Polyamides with Ultralow Dielectric Loss

Ultrahigh Heat/Fire‐Resistant, Mechanically Robust, and Closed‐Loop Chemical Recyclable Polycarbonate Enabled by Facile Bond Dissociation Energy Modulation

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