Synthesis of Hyperbranched Flame Retardants with Varied Branched Chains’ Rigidity and Performance of Modified Epoxy Resins

Hu, Jingyuan; Zhang, Liyue; Chen, Mingxuan; Dai, Jinyue; Teng, Na; Zhao, Hongchi; Ba, Xinwu; Liu, Xiaoqing

doi:10.3390/polym15020449

Cited by 6 publications

(1 citation statement)

References 49 publications

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“…Epoxy resin with excellent mechanical properties and heat resistance is an ideal resin matrix for manufacturing FRPs with high mechanical strength. Additionally, the 3D cross-linking network structure of the epoxy molecular chain will produce a large number of active -OH groups during the curing process [ 26 , 27 , 28 ]. Based on these reasons, in order to improve the interfacial adhesion of PI fiber-reinforced epoxy composites, the 4,4′-diamino-(1,1′-biphenyl)-3,3′-diol (HAB) diamine monomer containing bis-OH group was selected as the fourth monomer to introduce the BPDA/ p -PDA/BIA polyimide molecular chains in this work, which has been shown to significantly improve the cathode–electrolyte interface stability of lithium-ion batteries due to its rich chemical active sites for the polymer chains [ 29 ], and then, five kinds of PI fibers with different diamine ratios were manufactured through typical wet spinning technology.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Sun

et al. 2023

Polymers

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Developing polyimide (PI) fibers with excellent interfacial adhesion and high mechanical properties for the PI fiber-reinforced polymer matrix composites (PFRPs) industry has been challenging. In this work, 4,4′-diamino-(1,1′-biphenyl)-3,3′-diol (HAB) diamine was introduced into the rigid molecular chains, and the high-performance PI fibers, presenting an interfacial shear strength (IFSS) value of 46.33 MPa, tensile strength of 2.62 GPa, and modulus of 100.15 GPa, were successfully manufactured when the content of HAB in mixed diamines was 30 mol %. Fourier transform infrared (FTIR) spectroscopy identified the presence of intermolecular H-bonding interactions, and 2D small-angle X-ray scattering indicated that the introduction of HAB moiety contributed to reducing the radii of microvoids in the fibers, which were considered to be the key factors leading to a significant enhancement in the mechanical properties of the fibers. X-ray photoelectron spectroscopy (XPS) and the static contact angle intuitively illustrated that the synthetic fiber surface contained active hydroxyl groups. The IFSS value of PI fiber/epoxy resin composites (PI/EPs) was 56.47 MPa when the content of HAB reached 70 mol %. Failure morphologies confirmed that the interfacial adhesion of PI/EPs was enhanced owing to the surface activity of PI fibers. Consequently, this study provides an effective strategy to the long-standing problems of high mechanical performances and poor surface activity for traditional PI fibers used in the PFRPs industry.

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Section: Introductionmentioning

confidence: 99%

Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Sun

et al. 2023

Polymers

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A Hyperbranched Phosphorus/Nitrogen/Silicon‐Containing Polymer as a Multifunctional Additive for Epoxy Resins

Zhong,

Huo,

Wang

et al. 2024

Macromol. Rapid Commun.

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High‐performance, versatile epoxy resins (EPs) are used in a variety of fields, but the manufacture of transparent, fireproof, and strong EPs remains a major challenge. The hyperbranched, multifunctional flame retardant (DSi) is prepared by using diethanolamine, polyformaldehyde, diphenylphosphine oxide, and phenyltrimethoxysilane as raw materials in this work. When the additional amount of DSi is only 2 wt.%, the EP‐DSi2 sample reaches a vertical burning (UL‐94) V‐0, and its limiting oxygen index (LOI) is 32.8%. When the content of DSi is 3 wt.%, the peak heat release rate (PHRR) and total smoke production (TSP) of EP‐DSi samples are 43.8% and 21.4% lower than those of EP. The good compatibility of DSi and EP endows EP‐DSi with high transparency, and the hyperbranched structure of DSi makes EP‐DSi have obviously enhanced mechanical strength and toughness. The enhanced fire safety of EP‐DSi is mainly due to the promoting carbonization and radical quenching effects of DSi. This paper offers a comprehensive design concept aimed at creating high‐performance epoxy resins with good optical, mechanical, and flame‐retardant properties, which have broad application prospects.

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Preparation and characterization of PA66 composites by waste printed circuit board non‐metallic fractions

Ning,

Li,

Yuan

et al. 2024

Polymer Composites

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With the rapid advancement of contemporary technology, there has been a significant increase in electronic waste (e‐waste). The recycling of waste printed circuit board (WPCB) plays a crucial role in this context. The non‐metallic fractions (NMFs) derived from waste PCBs primarily consist of cured resin and fiber. In this study, NMF material from a PCB was ground into a powder and incorporated into a matrix of PA66 to produce PCB‐NMFs‐modified PA66. NMFs treated with inorganic acids are designated as I‐NMFs, while those treated with decanoic acid are referred to as DA‐NMFs. The results indicated that the use of reactive compatibilizers, specifically POE‐g‐MAH (15 parts), significantly enhances the properties of the composites. Among the chemical treatments applied to the NMFs, decanoic acid and n‐heptanoic acid were found to most effectively improve the impact strength of PA66 composites. In this study, decanoic acid was selected as the organic reagent for the treatment of NMFs, with an application amount of 6% relative to the mass of the NMFs. Notably, when DA‐NPCB was filled with 20% and the particle size was reduced to below 100 mesh, its impact strength reached 92.73 kJ/m2, representing an increase of 103.36%. Overall, utilizing PCB‐NMFs as a modifier for PA66 presents a promising and sustainable approach that not only reduces the processing costs associated with electronics but also enhances the performance of the plastic.Highlights PP‐g‐MAH can increase the bending and tensile stresses of composites. POE‐g‐MAH improves toughness and impact strength of composites. Twice as much increase in impact strength of decanoic acid‐treated composites. Realization of circuit board non‐metallic fractions resource utilization. Modifying and enhancing the properties of PA66 composites.

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Synthesis of Hyperbranched Flame Retardants with Varied Branched Chains’ Rigidity and Performance of Modified Epoxy Resins

Cited by 6 publications

References 49 publications

Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

A Hyperbranched Phosphorus/Nitrogen/Silicon‐Containing Polymer as a Multifunctional Additive for Epoxy Resins

Preparation and characterization of PA66 composites by waste printed circuit board non‐metallic fractions

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