Nanostructured Polymer Blends for Gas/Vapor Barrier and Dielectric Applications

Sadiku, Rotimi; Reddy, A. Babul; Gnanasekarana, D.; Oboirien, Bilainu; Aderibigbe, B. A.; Varaprasad, Kokkarachedu; Goddeti, Siva Mohan Reddy

doi:10.1016/b978-0-323-39408-6.00011-x

Cited by 10 publications

(4 citation statements)

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“…The literature review shows that aluminosilicates (e.g., halloysite) increase the amount of carbon layer formed. They act as insulators that hinder the diffusion of gaseous products of thermal decomposition into the flame, and at the same time constitute a barrier for oxygen diffusion into its interior ( Table 6 ) [ 70 , 71 , 72 ]. It should be noted that the lowest dm/dt parameter values were recorded for the straw:halloysite nanotubes filler ( Table 6 ).…”

Section: Resultsmentioning

confidence: 99%

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

2021

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Currently, up to 215 million metric tons of harvestable straw are available in Europe, 50% of the crops come from wheat, 25% from barley and 25% from maize. More than half of the production remains undeveloped. The overproduction of straw in the world means that the current methods of its management are insufficient. The article describes the production method and characterization of natural rubber biocomposites containing cereal straw powder modified with functional nano-additives in the form of carbon black, silica and halloysite nanotubes. The use of cereal straw in the elastomer matrix should contribute to obtaining a product with good mechanical properties while ensuring a low cost of the composite. In turn, the application of the mechanical modification process will allow the combination of specific properties of raw materials to obtain new, advanced elastomeric materials. As part of the work, hybrid fillers based on mechanically modified cereal straw were produced. The impact of hybrid fillers on mechanical, rheometric and damping properties was assessed. The flammability and susceptibility of the obtained biocomposites to aging processes were determined. The use of hybrid fillers based on mechanically modified straw allowed us to obtain a higher cross-linking density of vulcanizates (even up to 40% compared to the reference sample), and thus higher values of the rheometric moment during the vulcanization process of rubber mixtures (from approx. 10% (10 phr of filler) up to 50% (30 phr of filler) in relation to the unfilled system) and higher hardness of vulcanizates (by about 30–70%). The curing time of the blends was slightly longer, but the obtained composites were characterized by significantly higher tensile strength. The use of fillers in the elastomer matrix increased the modulus at 100, 200 and 300% and the elongation at break. Moreover, greater resistance of vulcanizates to the combustion process was confirmed.

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Section: Resultsmentioning

confidence: 99%

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

2021

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“…Many research groups have made significant contribution towards the modifications of the existing properties of polymeric materials via blending with polymers having barrier‐rich properties, thin transparent vacuum deposited coating, organic barrier coating or adhesive development of nanocomposite materials and so forth 3–6 . However, such modification also limits its recyclability and also results in migration of toxic chemicals when exposed to water and other acidic or alcoholic items.…”

Section: Introductionmentioning

confidence: 99%

Electron beam irradiation on monolayer plastic packaging films: Studies on physico‐mechanical and thermal properties

et al. 2021

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Linear low‐density polyethylene (LLDPE), biaxially oriented polypropylene (BOPP), polyethylene terephthalate (PET) and Nylon 6 films used for food packaging application were subjected to e‐beam (EB) irradiation at different doses in the range of 0 to 80 kGy. The mechanical, barrier, optical and thermal properties of the irradiated films were evaluated and compared with the non‐irradiated films. A notable decrease in oxygen transmission rate (OTR) was observed for BOPP and Nylon 6 specimens after irradiation, whereas for PET samples, no significant change was noticed. Water vapour transmission rate (WVTR) was found to exhibit a decreasing trend for PET and Nylon 6 samples but remains unchanged for BOPP after EB irradiation. Tensile strength (TS) of Nylon 6 and LLDPE films was found to increase upon irradiation up to 20 kGy, whereas for BOPP, a clear decreasing trend was observed. No significant change in TS and elongation at break was observed for PET film after irradiation. The melting temperature (Tm) and enthalpy of melting (ΔHm) were decreased with EB dose as revealed by differential scanning calorimetry (DSC) studies.

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“…EVA polymer dissolution.-The free radical polymerization between ethylene and vinyl acetate (VA) results in the formation of EVA. 26 The transport processes involved in the dissolution of polymers into a solvent are chain disentanglement and solvent diffusion, shown in Fig. 2, leading to the formation of a gel layer.…”

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confidence: 99%

An Investigation of the Recovery of Silicon Photovoltaic Cells by Application of an Organic Solvent Method

Tembo

Heninger²,

Subramanian

2021

ECS J. Solid State Sci. Technol.

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The treatment of photovoltaic (PV) waste is gaining traction the world over, with the recovery of valuable materials from end-of-life, or damaged and out-of-spec polycrystalline silicon PV modules. These materials are a focus of recycling. However, the current recycling practices usually involve excessive damage to PV cells that could otherwise be reused if extracted undamaged. The ability to extract undamaged PV cells, capable of reuse, would serve to further reduce the carbon footprint and cost associated with PV module manufacturing. This study focuses on the recovery of silicon PV cells from end-of-life PV modules by application of an organic solvent method. Herein, recovery tests were carried out in which silicon PV cells were recovered relatively undamaged with the application of hexane as solvent. XRD measurements showed that the recovered PV cells could be used in the fabrication of new PV modules.

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Nanostructured Polymer Blends for Gas/Vapor Barrier and Dielectric Applications

Cited by 10 publications

References 50 publications

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

Electron beam irradiation on monolayer plastic packaging films: Studies on physico‐mechanical and thermal properties

An Investigation of the Recovery of Silicon Photovoltaic Cells by Application of an Organic Solvent Method

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