Polymer Processing under Microwaves

Belkhir, Kedafi; Riquet, Guillaume; Becquart, Frédéric

doi:10.1155/2022/3961233

Cited by 12 publications

(7 citation statements)

References 110 publications

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“…These ceramic components absorb microwave energy and subsequently transfer heat to the polymer matrix and the fibers through conduction. 41,42 This method results in more uniform processing of specimens that are thick with low thermal conductivity. 31 As a result, the microwaveconventional combined heating method offers more homogeneous heating throughout the composite material.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, microwave radiation also interacts with ceramic tiles or disks within the setup. These ceramic components absorb microwave energy and subsequently transfer heat to the polymer matrix and the fibers through conduction 41,42 . This method results in more uniform processing of specimens that are thick with low thermal conductivity 31 .…”

Section: Methodsmentioning

confidence: 99%

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Development and characterization of microwave‐processed linear low‐density polyethylene based sisal/jute hybrid laminates

Maurya,

Kumar,

Prasad

et al. 2024

Polymer Composites

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Natural fiber‐reinforced composites are gaining significant popularity for their biodegradability and eco‐friendliness. Fiber modifications and hybridization have been used to address issues like hydrophilicity and fiber inhomogeneity. However, efficient manufacturing is still a challenge for natural fiber‐reinforced polymer composites. The present study explores the potential of microwave processing of hybrid laminates composed of sisal and jute fibers. The laminates, consisting of linear low‐density polyethylene (LLDPE) as matrix and sisal and jute as reinforcement materials were subjected to microwave processing at specific power, time, frequency, and loads. Four types of laminates with different stacking sequences: sisal‐sisal‐sisal (SSS), sisal‐jute‐sisal (SJS), jute‐sisal‐jute (JSJ), and jute‐jute‐jute (JJJ) were developed. The developed composites showed ~3% void content, with the SJS and JSJ composite having the least and highest void content, respectively. The SJS composite showed the highest tensile and flexural strength of 15.27 and 20.40 MPa, respectively, out of all the configurations and an improvement of 42% and 85% over pure LLDPE. Hybrid composites having high‐strength fibers in the skin layer exhibited superior mechanical properties. Microscopic examination of the fractured specimens revealed that fiber pull‐out and fiber breakage were the primary failure mechanisms of failure. Lateral failure due to delamination between matrix and fiber was predominant with grip and gauge regions as frequent failure points. The incorporation of sisal and jute fiber reinforcement into the polymers doesn't change the thermal stability of the fabricated composites significantly. The above results show that microwave‐assisted processing is a promising method for producing natural fiber‐reinforced hybrid polymer composites.Highlights Development of hybrid laminates using microwave energy at 2.45 GHz. The mechanism of microwave‐based processing of polymer composites has been discussed. Effect of layering sequence on mechanical and thermal properties of the developed composite. Assessment of tensile strength with morphology, flexural strength and thermo‐gravimetric analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Development and characterization of microwave‐processed linear low‐density polyethylene based sisal/jute hybrid laminates

Maurya,

Kumar,

Prasad

et al. 2024

Polymer Composites

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“…In summary, the research on FRP via the MAIL route is quite limited, requiring fundamental studies to clarify the interactions between MWs and reactants during the process of FRP. Therefore, the focus of further research studies should depend on the development of in situ observation instruments for FRP processes …”

Section: Synthesismentioning

confidence: 99%

Microwave Encounters Ionic Liquid: Synergistic Mechanism, Synthesis and Emerging Applications

Zhao,

Li,

Gao

2023

Chem. Rev.

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Progress in microwave (MW) energy application technology has stimulated remarkable advances in manufacturing and high-quality applications of ionic liquids (ILs) that are generally used as novel media in chemical engineering. This Review focuses on an emerging technology via the combination of MW energy and the usage of ILs, termed microwave-assisted ionic liquid (MAIL) technology. In comparison to conventional routes that rely on heat transfer through media, the contactless and unique MW heating exploits the electromagnetic wave−ions interactions to deliver energy to IL molecules, accelerating the process of material synthesis, catalytic reactions, and so on. In addition to the inherent advantages of ILs, including outstanding solubility, and well-tuned thermophysical properties, MAIL technology has exhibited great potential in process intensification to meet the requirement of efficient, economic chemical production. Here we start with an introduction to principles of MW heating, highlighting fundamental mechanisms of MW induced process intensification based on ILs. Next, the synergies of MW energy and ILs employed in materials synthesis, as well as their merits, are documented. The emerging applications of MAIL technologies are summarized in the next sections, involving tumor therapy, organic catalysis, separations, and bioconversions. Finally, the current challenges and future opportunities of this emerging technology are discussed.

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“…Therefore, microwave absorbers can be used as susceptors to generate heat under microwave irradiation, indirectly heating the non-polar materials to enhance polymer devolatilization. [17] Concerning the characterization of volatiles in polymer particles, various detection methods have been used in the literature to obtain the solubility and diffusion coefficient of volatiles under different operating conditions. Iannello et al [18] studied the devolatilization of single polypropylene (PP) particles in a fluidized bed through X-ray imaging and a gas analyzer and found that high temperature and suitable fluidizing medium were conducive to the removal of volatiles.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, microwave absorbers can be used as susceptors to generate heat under microwave irradiation, indirectly heating the non‐polar materials to enhance polymer devolatilization. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

Microwave heating and devolatilization characteristics of polyethylene particles in a fixed‐bed devolatilizer

Huang

Shuai

et al. 2023

Polymer Engineering & Sci

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A new method of microwave‐enhanced devolatilization has been proposed to solve the problem that volatiles of polyethylene particles are difficult to remove. Using water as microwave susceptor in a fixed‐bed devolatilizer, microwave heating characteristics were studied by optical fiber thermometry and infrared thermal imaging, and particle devolatilization characteristics were investigated by headspace gas chromatography. The results showed that bed temperature rose and particle devolatilization efficiency increased with heating time, moisture content, and input microwave power. The non‐uniform devolatilization at different positions existed due to the non‐uniform distribution of bed temperature in both radial and axial directions. The effective diffusion coefficient of volatiles under microwave irradiation increased with moisture content and input microwave power, and the microwave‐enhanced coefficient of water also increased with input microwave power. Microwave heating and devolatilization mechanism of moist polyethylene particles were proposed, in which the modes of mass and energy transfer were clarified. In view of the above, the feasibility of microwave‐enhanced polyethylene devolatilization has been confirmed.

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Polymer Processing under Microwaves

Cited by 12 publications

References 110 publications

Development and characterization of microwave‐processed linear low‐density polyethylene based sisal/jute hybrid laminates

Development and characterization of microwave‐processed linear low‐density polyethylene based sisal/jute hybrid laminates

Microwave Encounters Ionic Liquid: Synergistic Mechanism, Synthesis and Emerging Applications

Microwave heating and devolatilization characteristics of polyethylene particles in a fixed‐bed devolatilizer

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