Behavior under electron irradiation of two clay-based polymer nanocomposites PPgMA/OMMT and PBS/OMMT

Taktak, Sirine; Fakhfakh, S.; Rondot, S.; Tara, A.; Jbara, O.

doi:10.1016/j.matchemphys.2021.125230

Cited by 13 publications

(17 citation statements)

References 41 publications

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“…It is also reported that the peaks at 2 θ = 14.1°, 16.8°, 18.5° are related to the (110), (040), and (130) crystal planes of the α‐phase crystal of PP while there is a small peak attributed to the (300) crystal plane of β‐phase crystal plane of PP at 16.1°. On the other hand, PBS has α‐phase monoclinic crystals represented by crystal planes (020), (021), (110), and (111) at 2 θ = 19.6°, 21.9°, 22.6°, and 28.7° 28,44 . The results indicated that the position of XRD peaks of each polymer did not change, regardless of the PP loading content or addition of compatibilizer.…”

Section: Resultsmentioning

confidence: 97%

Enhancing crystallization, miscibility, and processability of bio‐based polybutylene succinate/polypropylene blended composites via coffee husk reinforcement

Lule

Wondu

Kim

2023

Polymers for Advanced Techs

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Many studies have suggested that the interfacial compatibility in blends play an important role in determining the overall properties of the corresponding composites. This study investigated the effects of blend miscibility on the rheological, mechanical, and crystallization properties of polybutylene succinate (PBS)‐based composites reinforced with coffee husk (CH). The composites were fabricated using surface‐treated CH that was treated with a compatibilizer prior to composite fabrication. The results showed that the handling and processability of the composites improved after the surface treatment of CH. The surface treatment helped to achieve miscibility in polymer blends, and the dispersion of the surface‐treated CH in the PBS matrix was uniform. Moreover, the tensile strength and modulus of the compatibilized composites showed fourfold and twofold increases compared to neat PBS. The frequency‐dependent rheological test revealed increase in viscosity (>1000 times) and storage modulus with compatibilization and filler reinforcement. The degree of crystallinity of the PBS in the compatibilized composites reduced to about 10%. Furthermore, the compatibilized composites also demonstrated superior thermal stability than their corresponding non‐compatibilized composites.

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Section: Resultsmentioning

confidence: 97%

Enhancing crystallization, miscibility, and processability of bio‐based polybutylene succinate/polypropylene blended composites via coffee husk reinforcement

Lule

Wondu

Kim

2023

Polymers for Advanced Techs

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“…The bulk discharge brings main part of trapped electrons to leave material surface in very short time leading to a fast decrease in the detrapping rate. In most studied materials [ 26 , 27 , 28 , 29 ], the detrapping rate decreases exponentially owing the influence current to take the same trends. Consequently, the influence current preserves moderate constant values for both temperatures, which means that detrapping process under high temperatures (below the melting peak) is constant.…”

Section: Resultsmentioning

confidence: 99%

“…This tendency fits well with other semi-crystalline polymers used in previous studies [ 28 , 29 ]. Generally, secondary electron emission depends on the sample’s specific crystalline state, particularly on the interaction of generated SEE with electrons, phonons, or crystalline defects [ 26 ]. By increasing temperatures near to melting temperature of XLPE material, the amorphous part is expended, and more defects are created by the disorder’s enhancement in the material.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the electron beam can be positioned to the chosen position with great precision (local irradiation) and several penetration depths of electrons in the irradiated sample can be achieved by changing their primary energy. The second point is that during a few decades of time, the developed theoretical aspect has been validated in a consistent experimental test with the buildup arrangement in a SEM on a large variety of materials ranging from glasses [ 22 , 27 ] passing through polymers [ 20 , 23 , 25 ] and ending with nano-composites [ 21 , 26 ].…”

Section: Fundamental Aspectsmentioning

confidence: 91%

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Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

et al. 2022

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The effect of isothermal conditions on the trapping/detrapping process of charges in e-beam irradiated thermally aged XLPE insulation in scanning electron microscopy (SEM) has been investigated. Different isothermal conditions ranging from room temperature to 120 °C are applied on both unaged and aged XLPE samples (2 mm thick) by a suitable arrangement associated with SEM. For each applied test temperature, leakage, and influence currents have been measured simultaneously during and after e-beam irradiation. Experimental results show a big difference between the fresh and aged material regarding trapping and detrapping behavior. It has been pointed out that in the unaged material deep traps govern the process, whereas the shallow traps take part in the aged one. Almost all obtained results reveal that the trapped charge decreases and then increases as the temperature increases for the unaged sample. A deflection temperature corresponding to a minimum is observed at 50 °C. However, for the aged material, the maximum trapped charge decreases continuously with increasing temperature, and the material seems to trap fewer charges under e-beam irradiation at high temperature. Furthermore, thermal aging leads to the occurrence of detrapping process at high temperatures even under e-beam irradiation, which explains the decrease with time evolution of trapped charge during this period. The recorded leakage current increases with increasing temperature for both cases with pronounced values for aged material. The effect of temperature and thermal aging on electrostatic influence factor (K) and total secondary electron emission yield (σ) were also studied.

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“…Additionally, the heat resistance of biopolymers is generally reduced, which renders them unsuitable for use in high-temperature settings [7]. Thus, nanoscale fillers are used to enhance of the overall material properties in order to obtain ultralight structural materials with high thermal conductivity, increased thermal stability, improved mechanical properties and increased resistance to oxidation [8][9][10][11][12][13]. Aliotta et al [14] provided an update on the synthesis, production, thermal, morphological and mechanical properties of polybutylene succinate (PBS) and its major copolymers, as well as its nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

Taktak

Fakhfakh

Rondot

et al. 2023

J. Phys. D: Appl. Phys.

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Isothermal conditions effects on the charge transport processes and electron emission properties in polybutylene succinate (PBS) nanoclay composites are investigated. The temperature range used (20°C to 80°C) is close to the conditions of use of materials in many applications (insulation, sensors). These effects are highlighted using an appropriate device, placed in a scanning electron microscope (SEM), allowing measurement of induced currents in an electron irradiated specimen. The experimental results showed that the rise in temperature involves a decrease in the charging ability and an increase in conductivity of PBS nanocomposites. The mobility of charge carriers and its thermal dependency deduced during the discharge step were found to be lower for the nanocomposites. A qualitative analysis, expressed for understanding these observations, is based on the determination of electron trap energy distribution (i.e. density of occupied states). Secondary electron emission yield decreased with increasing temperature. The results help us envision a new class of insulators with improved electrical performances. The operating thermal stress, combined with the absence of trapped charges, allows to reduce the electrical and thermal aging and to ensure consequently the long-term reliability of the insulators (for instance under HV).

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Behavior under electron irradiation of two clay-based polymer nanocomposites PPgMA/OMMT and PBS/OMMT

Cited by 13 publications

References 41 publications

Enhancing crystallization, miscibility, and processability of bio‐based polybutylene succinate/polypropylene blended composites via coffee husk reinforcement

Enhancing crystallization, miscibility, and processability of bio‐based polybutylene succinate/polypropylene blended composites via coffee husk reinforcement

Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

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