The synthesis and properties of isocyanate-based polyimide foam composites containing MWCNTs of various contents and diameters

Xu, Xinyu; Cao, Jingjing; Zhang, Yudi; Yang, Fukai; Deng, Yuyuan

doi:10.1039/d1ra06721d

Cited by 11 publications

(7 citation statements)

References 34 publications

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“…14 To examine the merits of this work, the fire-resistant property is compared with that of previously reported isocyanate-based PIFs. As shown in Figure 8b, the previous counterparts included the PIF modified by silica aerogel (PIF/ SA), 14 aramid honeycomb core (PIF/ARHC), 27 tri (1-chloro-2-propyl) phosphate (PIF/TCPP), 28 graphene oxide (PIF/ GO), 11 multiwalled carbon nanotubes (PIF/MWCNT), 29 graphite (PIF/graphite), 30 and vermiculite (PIF/vermiculite). 31 Overall, the PIF/SiO 2 -8 composite prepared in this work had the highest LOI value.…”

Section: Resultsmentioning

confidence: 99%

Organic–Inorganic Hybrid Isocyanate-Based Polyimide Foams with Excellent Fire Resistance and Thermal Insulation Performance

Liu

Zhou

Zhang

2022

ACS Appl. Polym. Mater.

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Due to the formation of urea byproducts in the preparation process, isocyanate-based polyimide foams (PIFs) are flammable, and fire-resistant properties need further improvement. In this paper, a simple and low-cost organic−inorganic hybrid method was proposed to successfully construct high-performance fire-retardant isocyanate-based PIF/SiO 2 composites. With the increase of SiO 2 content, the fire resistance of PIF/SiO 2 composites was significantly improved. Cone calorimetry test suggested that the peak heat release rate (PHRR) of the PIF/SiO 2 -8 composite was reduced by 58.0% than that of the neat PIF. Moreover, the limiting oxygen index (LOI) value for the composite was as high as 59.68%, exceeding the LOI values of all previously reported isocyanate-based PIFs and some PIFs prepared using the powder foaming method. Meanwhile, the PIF/SiO 2 composites exhibited outstanding thermal insulation performance at high temperatures due to their excellent fire resistance. This work provides a promising approach for constructing isocyanate-based PIF with superior flame-retardant performance and is conducive to broaden the scope of their applications in aerospace, architecture, and other fields.

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Section: Resultsmentioning

confidence: 99%

Organic–Inorganic Hybrid Isocyanate-Based Polyimide Foams with Excellent Fire Resistance and Thermal Insulation Performance

Liu

Zhou

Zhang

2022

ACS Appl. Polym. Mater.

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“…The increased MWCNTs content might have led to a tighter arrangement of the polymer chains, limiting water absorption. 35,36 The MWCNTs@PC/KC/PAAc nanocomposite with 0.15 wt% MWCNTs content exhibited the highest swelling percentage. This composition was selected as it provided a greater number of available active sites on the network structure, which is important for effective adsorption.…”

Section: Swelling Propertiesmentioning

confidence: 97%

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

Aboelkhir,

Sayed,

Eldondaity

et al. 2024

J of Applied Polymer Sci

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This study addresses the critical issue of removing toxic dyes from industrial wastewater to protect the environment and human health. To address this challenge, a bio‐based composite hydrogel was synthesized using gamma irradiation, 20 kGy, incorporating multiwalled carbon nanotubes@pectin/κ‐carrageenan/polyacrylic acid (MWCNTs PC/KC/PAAc) for removing methylene blue (MB) dye from aqueous solutions. The prepared composites underwent characterization through Fourier‐transform infrared spectroscopy, x‐ray diffraction, and thermogravimetric analyses. Brunauer–Emmett–Teller analysis demonstrated a significant increase in surface area upon the addition of MWCNTs. Specifically, the surface area increased from 342.5 m2 g−1 for PC/KC/PAAc to 689.5 m2 g−1 when 0.175&#x02009;wt% of MWCNTs were added. Also, scanning electron microscopy and atomic force microscopy were utilized to examine the surface topography of PC/KC/PAAc and MWCNTs@PC/KC/PAAc. The results reveal that at 0.175&#x02009;wt% of MWCNTs, there was a more uniform surface topography with well‐distributed MWCNTs within the matrix. In the adsorption study of MB dye, it was found that the highest MB removal efficiency was achieved at pH&#x02009;11, with values of 68.21% and 96% for PC/KC/PAAc and MWCNTs@PC/KC/PAAc, respectively. Furthermore, upon studying the effect of MWCNTs (%), the results showed that the removal (%) of PC/KC/PAAc was 68.21&#x02009;±&#x02009;1.02%, and this percentage increased rapidly with the addition of MWCNTs, reaching a maximum of 96&#x02009;±&#x02009;0.85% when 0.175 (wt%) of MWCNTs was added. Isotherm and kinetic modeling demonstrated that MB adsorption follows the Freundlich isotherm for PC/KC/PAAc and the Redlich–Peterson isotherm for MWCNTs@PC/KC/PAAc, both following a pseudo‐second‐order kinetics model. In addition, from AFM data, after MB removal, the height increased significantly from 322&#x02009;nm for PC/KC/PAAc to 810&#x02009;nm for MWCNTs@PC/KC/PAAc (0.175&#x02009;wt%), indicating a substantially higher adsorption of MB by MWCNTs@PC/KC/PAAc.

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“…35 Inorganic fillers not only improve the morphology and physical properties of foaming materials, but also act as nucleating agents in the LDPE/HDPE foam process, resulting in a decrease in cell size and an increase in cell density. 36 CSW shows a fiber-shaped single crystal with many excellent characteristics, such as high stiffness, high strength, excellent heat resistance and low cost, and is widely used as a reinforcing filler in plastic, paint and rubber. 37,38 Nevertheless, CSW is an inorganic filler, while PE is an organic matter; the compatibility of these two materials is generally poor, which may fail to form a well-bonded interface between CSW and the PE matrix, and thus may deteriorate the properties of organic-inorganic foaming materials.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of the thermal stability and mechanical properties of low-density polyethylene/high-density polyethylene foam using a modified calcium sulfate whisker

Xu,

Zhong,

et al. 2023

New J. Chem.

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The synthesis and properties of isocyanate-based polyimide foam composites containing MWCNTs of various contents and diameters

Abstract: PIFs were synthesized using in situ polymerization from PAPI, PMDA, and MWCNTs (0.05, 0.1, 0.2, 0.4, and 0.6 wt%) functionalized with –OH; the diameters were 10–20 nm, 20–30 nm, and >50 nm.

Cited by 11 publications

References 34 publications

Organic–Inorganic Hybrid Isocyanate-Based Polyimide Foams with Excellent Fire Resistance and Thermal Insulation Performance

Organic–Inorganic Hybrid Isocyanate-Based Polyimide Foams with Excellent Fire Resistance and Thermal Insulation Performance

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

Reinforcement of the thermal stability and mechanical properties of low-density polyethylene/high-density polyethylene foam using a modified calcium sulfate whisker

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