Experimental investigation of absorption shielding efficiency of rubber composites

Kruželák, Ján; Kvasničáková, Andrea; Hložeková, Klaudia; Dosudil, Rastislav; Gořalík, Marek; Hudeč, Ivan

doi:10.1007/s00289-023-04684-x

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Regarding the Shore A hardness values, a slight increase is observed as the DCP concentration rises, reaching the typical value of 50 Shore A for this silicone rubber grade. Kruželák et al 12 and Verheyen et al 13 reported the exact same trend for hardness when studying DCP‐crosslinked rubbers. However, none of the aforementioned authors suggests a reason why the increment in the DCP concentration does not proportionally reflect an increase in these properties.…”

Section: Resultsmentioning

confidence: 63%

“…This combination of kinetic, thermodynamic, and now molecular dynamic‐based investigation of an industrially significant material contributes not only to the understanding of peroxide‐cured poly(siloxane)s, but also to polymeric systems with similar chemistry and molecular structure, such as organic elastomers. Besides, the correlation among molecular characteristics and bulk properties is novel for peroxide‐crosslinked silicones, explaining the usual concentration of DCP applied in the industry (up to 1 phr), and the behavior described in the literature, such as the studies of Kruželák et al 12 and Verheyen et al 13 but not yet elucidated.…”

Section: Introductionmentioning

confidence: 99%

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Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Freitas

Monks

Kerschbaumer

et al. 2023

J of Applied Polymer Sci

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Application of elastomers in general demands the conversion of their soluble networks into crosslinked structures. This abrupt change causes several modifications, both in the atomic/molecular level and at the macro‐scale. In this study, solid silicone rubber (high molecular weight poly(dimethylsiloxane)), was crosslinked with dicumylperoxide (DCP), a widely used crosslinking agent by the rubber industry. The changes caused by different DCP concentrations were investigated, aiming to bring attention to the molecular transformations, usually neglected when processing‐oriented studies are conducted. DCP concentration showed a limited contribution to the network's molecular dynamics, which was found to be mainly dominated by entanglements. The dominance of entanglements over other molecular constraints, like crosslink points, justifies the threshold and counter‐intuitive behavior of tensile and hardness properties. However, differences were found in the crystallization ability after crosslinking, when the more crosslink points were introduced, the lower the crystallinity was and the less stable the PDMS crystallites were. In addition to providing a deeper understanding of an industrially applied rubber system n terms of the effective concentration of DCP, and the reasoning behind such concentration, the findings of this study add to the state‐of‐the‐art comprehension of elastomeric networks, and how they behave on a molecular level.

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Freitas

Monks

Kerschbaumer

et al. 2023

J of Applied Polymer Sci

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show abstract

“…34,44 Peroxide-curing is generally the chosen method to synthesise cross-linked rubbers and DCP is a wellknown curing agent in rubber applications 34,[45][46][47][48] as it is stable during elastomer processing and it degrades readily at the desired curing temperature. [45][46][47][48] The terpolymers prepared with 1,2-epoxyoctane, 1,2-epoxydecane and 1,2-epoxydodecane as monomers were cross-linked in the presence of DCP in a compression mould. The curing was carried out at 170 °C, which is a high enough temperature to allow rapid cross-linking (Table S2 †) and sufficiently low to avoid degradation of the polycarbonates (as assessed by TGA, see Fig.…”

Section: Cross-linking Of the Polycarbonatesmentioning

confidence: 99%

Novel elastic rubbers from CO₂-based polycarbonates

Chiarioni¹,

Duin²,

Pescarmona³

2023

Green Chem.

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Machinability of wood-plastic composites from the CNC milling process using the Box-Behnken design and response surface methodology for building applications

Homkhiew,

Cheewawuttipong,

Srivabut

et al. 2024

Journal of Thermoplastic Composite Materials

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This research investigated the optimization of CNC milling parameters on hardness and surface roughness properties resulting from variations in speed (220, 470, and 720 rpm), feed rate (200, 300, and 400 mm/min), and depth of cut (3, 5, and 7 mm) based on experimental design. This study aimed to evaluate the effects and relation of milling parameters using different end mill diameters (8 and 12 mm) for machining wood-plastic composites (WPCs). All of the experimental runs were determined by the Box-Behnken design and optimized using the response surface methodology. The findings from this study revealed that the main milling parameters significantly affected the hardness, average roughness ( Ra), and mean peak-to-valley height ( Rz) of the WPCs. Increasing the speed in a range from 220 to 720 rpm resulted in higher hardness values. On the other hand, the Ra and Rz was decreased. Additionally, this experimental result is different from the morphological structure and surface observation. It was seen that the CNC milling conditions using high speed at 720 rpm displayed smooth surfaces, which resulted in visible evenness on the WPC surfaces. Finally, numerical optimization is a good technique for the experimental results and the predicted values. The predicted conditions for the CNC milling process using end mill diameters of 8 and 12 mm included a speed of 720 rpm, a feed rate of 300 mm/min, and a depth of cut of 3 mm with the best desirability of 0.973 (97.30%). These conditions were verified in the response models and confirmed the optimal values from observed values for the variables included in the models. Also, these optimal conditions for the CNC milling parameters can be used on other types of WPCs with melting points of plastic higher than 180°C.

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Experimental investigation of absorption shielding efficiency of rubber composites

Cited by 3 publications

References 25 publications

Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Novel elastic rubbers from CO₂-based polycarbonates

Machinability of wood-plastic composites from the CNC milling process using the Box-Behnken design and response surface methodology for building applications

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Experimental investigation of absorption shielding efficiency of rubber composites

Cited by 3 publications

References 25 publications

Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Peroxide‐based crosslinking of solid silicone rubber, part II: The counter‐intuitive influence of dicumylperoxide concentration on crosslink effectiveness and related network structure

Novel elastic rubbers from CO2-based polycarbonates

Machinability of wood-plastic composites from the CNC milling process using the Box-Behnken design and response surface methodology for building applications

Contact Info

Product

Resources

About

Novel elastic rubbers from CO₂-based polycarbonates