Improvement of thermal stability and gamma‐ray absorption in microwave absorbable poly(methyl methacrylate)/graphene nanoplatelets nanocomposite

Bel, Tayfun; Muhammettursun, Mahmut; Kocacinar, Elif; Erman, Ecem; Gul, Fuat Berke; Dogan, Emre; Celep, Murat; Baydoğan, Nilgün

doi:10.1002/app.50897

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…The mechanism that delays this diffusion and char formation has been described as the “tortuous path” effect of GNP. [ 5,43 ] Similar observations were observed for PA11/GNP [ 23 ] , PA11/expanded graphite, [ 32 ] and poly(methyl methacrylate)/GNP [ 44 ] nanocomposites.…”

Section: Resultssupporting

confidence: 77%

Enhanced mechanical and thermal properties of graphene nanoplatelets‐reinforced polyamide11/poly(lactic acid) nanocomposites

Durmaz

Aytaç

2022

Polymer Engineering & Sci

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The present paper aims to obtain a sustainable nanocomposite by using bio‐based polyamide 11 and biodegradable poly (lactic acid) blend as matrix and graphene nanoplatelets (GNP) as nanofiller. GNP was incorporated in the PA11/PLA blend matrix in the ratio of 0.5‐1‐3‐5‐10 wt% through the twin‐screw extruder. The crystallinity of PA11 in the blend, which was 12.9%, increased with the inclusion of GNP, and the highest crystallinity value was observed at 20% for the 1GNP sample. The crystallinity of PLA in the blend, which was 2.3%, increased to 4.6% with 5 wt% GNP addition. The inclusion of GNP to PA11/PLA improved the thermal degradation temperatures and increase the char residue. Also, increments were observed for storage modulus, loss modulus, and glass transition temperature of the matrix with the inclusion of GNP. The addition of GNP caused the tensile strength of the matrix to increase first and then decrease at higher amounts due to the agglomerations. 0.5–1 wt% GNP increased tensile strength by 10% and 5%, respectively. Increasing the amount of GNP to 10 wt% led to a sharp decrease in tensile strength by 24%. Overall, GNP is a suitable nanofiller to enhance the thermal and mechanical features of the PA11/PLA blend.

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Section: Resultssupporting

confidence: 77%

Enhanced mechanical and thermal properties of graphene nanoplatelets‐reinforced polyamide11/poly(lactic acid) nanocomposites

Durmaz

Aytaç

2022

Polymer Engineering & Sci

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“…As presented in Table 3, the nanocomposite specimen containing 0.3 wt% aligned GONPs experienced the maximum thermal stability improvement compared with the neat epoxy. In addition, comparing the thermal stability results obtained from TGA with previous studies (e.g., 22,23 ) confirms that the alignment of GONPs is more suitable than their random distribution. GONPs with their two-dimensional structure, could act as effective heat conductors and transfer heat in the epoxy matrix during the decomposition of the nanocomposite.…”

Section: Conditionssupporting

confidence: 74%

“…They used the calendaring method to disperse 0.5 wt% GNPs in an epoxy resin and found that the degradation temperature of the nanocomposite was 20°C increased compared with the pure epoxy. Bel et al 23 studied the thermal stability of poly(methyl methacrylate)/graphene nanoplatelet nanocomposites. They reported that the addition of 2 wt% graphene nanoplatelets caused an improvement in decomposition temperature from 196.73 to 243°C at 5% weight loss in TGA analysis.…”

Section: Introductionmentioning

confidence: 99%

The effect of aligning graphene‐oxide nanoplatelets on moisture absorption and thermal stability of polymeric nanocomposites

Karimi,

Khoramishad,

Fatolahi

2023

J of Applied Polymer Sci

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This article investigates the effect of aligning graphene‐oxide nanoplatelets (GONPs) on the moisture absorption and thermal stability of polymeric nanocomposites. Various nanocomposite specimens were fabricated using different GONP contents to improve water uptake resistance and thermal stability by aligning GONPs using an AC electric field during manufacturing. The results showed that aligning 0.3 wt% GONPs resulted in the most significant improvements, with the reductions of 76% and 54% observed in the water uptake of nanocomposites at the initial and saturation stages, respectively. The thermal stability of the nanocomposite specimens was also investigated using thermogravimetric analysis, in which nanocomposites containing 0.3 wt% randomly dispersed GONPs demonstrated improved performance compared with the neat epoxy specimen. However, aligning GONPs resulted in a marginal effect on the thermal stability parameters of nanocomposites. Moreover, Fourier transform infrared spectroscopy was conducted to investigate the chemical nature and hydrophilicity of the specimens. In addition, the freeze‐fractured surfaces of the neat and nanocomposite specimens were investigated using scanning electron microscopy. The results indicated the role of nanoparticle alignment in enhancing the performance of nanocomposites under hygrothermal conditions in terms of water uptake, which is of high importance in the marine industry.

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“…Bel et al developed poly(methyl methacrylate)/graphene (PMMA/GNP) nanocomposites suitable for applications on the outside of electronic devices in commercial satellites [ 60 ]. These materials showed good thermal resistance, lightness, and gamma and microwave absorption properties.…”

Section: Thermal Stability Of Carbon-filled Polymer Composites For Sp...mentioning

confidence: 99%

A Comprehensive Review on the Thermal Stability Assessment of Polymers and Composites for Aeronautics and Space Applications

Barra,

Guadagno,

Raimondo

et al. 2023

Polymers

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This review article provides an exhaustive survey on experimental investigations regarding the thermal stability assessment of polymers and polymer-based composites intended for applications in the aeronautical and space fields. This review aims to: (1) come up with a systematic and critical overview of the state-of-the-art knowledge and research on the thermal stability of various polymers and composites, such as polyimides, epoxy composites, and carbon-filled composites; (2) identify the key factors, mechanisms, methods, and challenges that affect the thermal stability of polymers and composites, such as the temperature, radiation, oxygen, and degradation; (3) highlight the current and potential applications, benefits, limitations, and opportunities of polymers and composites with high thermal stability, such as thermal control, structural reinforcement, protection, and energy conversion; (4) give a glimpse of future research directions by providing indications for improving the thermal stability of polymers and composites, such as novel materials, hybrid composites, smart materials, and advanced processing methods. In this context, thermal analysis plays a crucial role in the development of polyimide-based materials for the radiation shielding of space solar cells or spacecraft components. The main strategies that have been explored to improve the processability, optical transparency, and radiation resistance of polyimide-based materials without compromising their thermal stability are highlighted. The combination of different types of polyimides, such as linear and hyperbranched, as well as the incorporation of bulky pendant groups, are reported as routes for improving the mechanical behavior and optical transparency while retaining the thermal stability and radiation shielding properties. Furthermore, the thermal stability of polymer/carbon nanocomposites is discussed with particular reference to the role of the filler in radiation monitoring systems and electromagnetic interference shielding in the space environment. Finally, the thermal stability of epoxy-based composites and how it is influenced by the type and content of epoxy resin, curing agent, degree of cross-linking, and the addition of fillers or modifiers are critically reviewed. Some studies have reported that incorporating mesoporous silica micro-filler or microencapsulated phase change materials (MPCM) into epoxy resin can enhance its thermal stability and mechanical properties. The mesoporous silica composite exhibited the highest glass transition temperature and activation energy for thermal degradation among all the epoxy-silica nano/micro-composites. Indeed, an average activation energy value of 148.86 kJ/mol was recorded for the thermal degradation of unfilled epoxy resin. The maximum activation energy range was instead recorded for composites loaded with mesoporous microsilica. The EMC-5p50 sample showed the highest mean value of 217.6 kJ/mol. This remarkable enhancement was ascribed to the polymer invading the silica pores and forging formidable interfacial bonds.

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Improvement of thermal stability and gamma‐ray absorption in microwave absorbable poly(methyl methacrylate)/graphene nanoplatelets nanocomposite

Cited by 10 publications

References 42 publications

Enhanced mechanical and thermal properties of graphene nanoplatelets‐reinforced polyamide11/poly(lactic acid) nanocomposites

Enhanced mechanical and thermal properties of graphene nanoplatelets‐reinforced polyamide11/poly(lactic acid) nanocomposites

The effect of aligning graphene‐oxide nanoplatelets on moisture absorption and thermal stability of polymeric nanocomposites

A Comprehensive Review on the Thermal Stability Assessment of Polymers and Composites for Aeronautics and Space Applications

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