Enhanced mechanical and thermal properties of polyurethane‐imide foams with the addition of expended vermiculite

Xiong, Weiwen; Wu, Jiali; Tian, Huafeng; Wang, Chaoyang; Wu, Qiangxian

doi:10.1002/pc.25419

Cited by 9 publications

(11 citation statements)

References 35 publications

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“…By increasing the filler loading, more bulky foam was obtained and the amount of residual char increased parallel with the TGA results. As reported in the literature, 22,28,67,71–77 incorporation of VMT led to increase in the flame spread resistance and some important reasons were underlined as follows. As known, VMT is a natural mineral that mostly composed of SiO 2 , Al 2 O 3 , Fe 2 O 3 .…”

Section: Resultsmentioning

confidence: 78%

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Expanded vermiculite-filled flexible polymer composites

Cetin

Toprakçi

Taşkın

et al. 2021

Journal of Elastomers & Plastics

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This study focuses on the fabrication and characterization of vermiculite-filled flexible polymer composites. Exfoliated vermiculite was incorporated into triblock thermoplastic elastomer copolymer, styrene- b-(ethylene- co-butylene)- b-styrene (SEBS), at various levels from 1 to 15 wt% by a high shear mixer. The composite films were obtained by the combination of solvent casting and compression molding. The morphological, structural, thermal, and mechanical properties and contact angle of the composites were determined. Some micro-morphological differences were observed between the samples and the difference was assumed to be caused by high shear mixing and filler concentration. High shear mixing was found effective in terms of the detachment of vermiculite layers at all concentrations. However, at low filler loading, that behavior was more obvious. At 1 wt% filler concentration, mechanical properties increased that was probably caused by good filler-matrix interaction stemmed from smaller particle size. At higher vermiculite concentrations, fillers found to show agglomerations that led to a decrease in mechanical strength and strain at break. Elastic and secant modulus showed an increasing trend. Contact angle measurements were carried out to determine the oleophilic character of the samples. An increase in the vermiculite content resulted in higher oleophilic character and the lowest contact angle was obtained at 15 wt% VMT loading. In addition to these, thermal stability, thermal dimensional stability and flame retardancy were improved by the incorporation of VMT. 15 wt% vermiculite-filled sample showed the best performance in terms of thermal stability and flame retardancy.

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Section: Resultsmentioning

confidence: 78%

“…72,73 It was also reported that foamy morphology functioned as a barrier layer for delaying the spread of the flame by minimizing the air contact that also led to decrease in heat transfer. 22,28,67,71–78…”

Section: Resultsmentioning

confidence: 99%

Expanded vermiculite-filled flexible polymer composites

Cetin

Toprakçi

Taşkın

et al. 2021

Journal of Elastomers & Plastics

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“…In addition, vermiculite particles act like a barrier, which hinder leaving the volatile gases from the material and retard the decomposition processes. 54…”

Section: Resultsmentioning

confidence: 99%

Investigation of the internal structure, combustion, and thermal resistance of the rigid polyurethane materials reinforced with vermiculite

Kirbaş

2020

Journal of Thermoplastic Composite Materials

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In this study, 5%, 10%, and 15% vermiculite was added to the rigid polyurethane (PU) structure as a fire retardant. The scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), limiting oxygen index, thermal gravimetric analysis, differential scanning calorimetric (DSC) curves, and combustion behavior of the composite materials were investigated. When SEM/EDS analyses were examined, it was observed that surface morphology was affected by the amount of additive material. When XRD analyses were examined, peaks appeared in three different groups. Thermogravimetric analysis was used to determine the thermal stability of PU material with the addition of vermiculite. When the DSC analysis was examined, four temperature zones were obtained. The combustion behaviors of the vermiculite added PU samples with single-flame source and the flammability classes were determined with TS EN ISO 11925-2 standard. It can be said that the usage of inorganic mineral, which is harmless to the environment, can enhance the thermal stability of the material and also reduce the cost of production.

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“…Clearly, the polyimide-based foam preserved the original structure, revealing its prominent high temperature resistance. Because of this excellent heat resistance performance, the polyimide foam materials have been widely used in navigation, aviation, and other fields. − Therefore, it can be concluded that the as-prepared polyimide-based foam has outstanding combustion resistance performance. Interestingly and meaningfully, Zhang et al investigated the relationship between thermal conductivity, flexibility, and density of the 3D hybrid foams (Figure a–e) .…”

Section: Multifunctional Properties and Relevant Mechanisms Of Polyim...mentioning

confidence: 99%

Polyimide-Based Foams: Fabrication and Multifunctional Applications

Wang

Zhou

et al. 2020

ACS Appl. Mater. Interfaces

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Because of their unique three-dimensional cellular structure and intrinsic properties, polyimide foam materials have bright prospects for development in multiple functional equipment, which arouses extensive concern. In this Spotlight on Applications, several typical fabrication methods of polyimide foams and the related synthesis mechanism have been systematically described. The advantages and disadvantages of the preparation methods have been compared with each other. Representative functions and the corresponding mechanism models have been concluded, which involve thermal, mechanical, sensing, electromagnetic, environmental, and electrical fields. In the end, the severe tasks and challenges of polyimide foam materials have been summarized, and their promising future development is worth expecting.

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Enhanced mechanical and thermal properties of polyurethane‐imide foams with the addition of expended vermiculite

Cited by 9 publications

References 35 publications

Expanded vermiculite-filled flexible polymer composites

Expanded vermiculite-filled flexible polymer composites

Investigation of the internal structure, combustion, and thermal resistance of the rigid polyurethane materials reinforced with vermiculite

Polyimide-Based Foams: Fabrication and Multifunctional Applications

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