Enhancing the Reversion Resistance, Crosslinking Density and Thermo-Mechanical Properties of Accelerated Sulfur Cured Chlorobutyl Rubber Using 4,4′-Bis (Maleimido) Diphenyl Methane

Gopisathi, Shibulal; Park, Changsin; Huh, Yang Il; Jeon, Jinseok; Yun, Chang Hyun; Won, Joohye; Jeong, Kwang‐Un; Nah, Changwoon

doi:10.5254/rct-18-82605

Cited by 5 publications

(3 citation statements)

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“…During the earlier stages of thermal aging, there is cross-links rearrangement from a polysulfidic to a monosulfidic chain. 29 Fluctuations at some points are probably caused by the balancing between the cross-link scission and the cross-link formation in the polymer. Both cross-link scission and cross-link formation occur simultaneously, and these reactions occur all the time in the aging process.…”

Section: Results and Discussionmentioning

confidence: 99%

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

et al. 2020

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With increased awareness on the importance of gloves arising from the COVID-19 pandemic, people are expected to continue using them even after the pandemic recedes. This scenario in a way increased the rubber solid waste disposal problem; therefore, the production of biodegradable gloves may be an option to overcome this problem. However, the need to study the shelf life of biodegradable gloves is crucial before commercialization. There are well-established models to address the failure properties of gloves as stated in the American Society for Testing and Material (ASTM) D7160. In this study, polysaccharide-based material-filled natural rubber latex (PFNRL) gloves, which are biodegradable gloves, were subjected to an accelerated aging process at different temperatures of 50–80 °C for 1–120 days. Prediction models based on Arrhenius and shift factors were used to estimate the shelf life of the PFNRL gloves. Based on the results obtained, the estimated time for the PFNRL gloves to retain 75% of their tensile strength at shelf temperature (30 °C) based on Arrhenius and shift factor models was 2.8 years. Verification on the activation energy based on the shift factor model indicated that the shelf life of PFNRL gloves is 2.9 years, which is only a 3.6% difference. The value obtained is aligned with the requirement in accordance with ASTM D7160, which states that only up to a maximum of 3 years’ shelf life is allowed for the gloves under accelerated aging conditions.

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Section: Results and Discussionmentioning

confidence: 99%

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

et al. 2020

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“…For unirradiated composites, it can be observed that the blank SBR/DWR 50/50 samples have the highest compression set when compared with filled composite. At the same time, this performance was acquired in irradiated composites, but the values of compression set were decreased for the same type of silicate filler when compared with unirradiated one, owing to increased cross-link density which inversely proportional to cross-link density [ 34,35]. Besides, it can be seen that the SBR/DWR 50/50 composites loaded by PS-MS 20/20 gave the lowest values for compression set, and this was achieved for unirradiated and irradiated ones, owing to the increased cross-link density of these composites.…”

Section: Compression Setmentioning

confidence: 86%

Manifestation of Waste Silicate Type Additives and Electron Beam Irradiation on Properties of Sbr/devulcanized Waste Tire Rubber Composites for Floor Tiles Applications

El‐Nemr¹,

Ali²,

Gad³

2021

Preprint

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Virgin styrene-butadiene rubber (SBR) was replaced by devulcanized waste tire rubber (DWR) 50/50 and used as a rubber base for preparing composites to depend on different silicate types at fixed content 40 phr (part per hundred part of rubber). All composites were mixed on a rubber roll mill and then subjected to electron beam irradiation to induce cross-linking at a dose of 100 kGy. Different silicate fillers were used in this study like precipitated silica (PS) 40 phr, waste glass window (WG) - PS 20/20 phr, fly ash (FA)-PS 20/20 phr, and micaosilica (MS)-PS 20/20 phr. Waste silicate was treated with (3-aminopropyl)trimethoxysilane (APTMS) and blended with PS. Mechanical properties were investigated for composites like tensile strength, elongation at break, tensile modulus, and calculation of cross-link density from mechanical. As well as, application for floor tiles included compression set and abrasion resistance measurements. All results indicated an enhancement in tensile strength, modulus, and cross-link density by adding silicate fillers and more enhanced in presence of radiation. For the application of floor tiles, the MS filler gave a good compression set and abrasion resistance followed by other silicate fillers (PS, FA), except WG.

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“…This may help the scientist establish the actual chemical reaction mechanisms involved in the curing process at the molecular level using advanced characterization techniques such as differential scanning calorimetry (DSC), nuclear magnetic resonance (HNMR), and infrared (IR) spectrometry, etc. From our previous experimental investigation, it has been observed that bismaleimide can react with halogenated rubbers during curing [26][27][28][29], and can also interact with NR/CV and butadiene rubber (BR)/CV systems via Diels-Alder and Alder-ene reactions [30][31][32]. Sadao Inoue filed a patent based on a chloroprene rubber and bismaleimide/ZnO composition for the development of vulcanizate with a high degree of crosslink density [33].…”

Section: Introductionmentioning

confidence: 99%

Rheometer Evidences for the Co-Curing Effect of a Bismaleimide in Conjunction with the Accelerated Sulfur on Natural Rubber/Chloroprene Rubber Blends

et al. 2021

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The rheometer curing curves of neat natural rubber (NR) and neat chloroprene rubber (CR) with maleide F (MF) exhibit considerable crosslinking torque at 180 °C. This indicates that MF can crosslink both these rubbers via Alder-ene reactions. Based on this knowledge, MF has been introduced as a co-crosslinking agent for a 50/50 blend of NR and CR in conjunction with accelerated sulfur. The delta (Δ) torque obtained from the curing curves of a blend with the addition of 1 phr MF was around 62% higher than those without MF. As the content of MF increased to 3 phr, the Δ torque was further raised to 236%. Moreover, the mechanical properties, particularly the tensile strength of the blend with the addition of 1 phr MF in conjunction with the accelerated sulfur, was around 201% higher than the blend without MF. The overall tensile properties of the blends cured with MF were almost retained even after ageing the samples at 70 °C for 72 h. This significant improvement in the curing torque and the tensile properties of the blends indicates that MF can co-crosslink between NR and CR via the Diels–Alder reaction.

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Enhancing the Reversion Resistance, Crosslinking Density and Thermo-Mechanical Properties of Accelerated Sulfur Cured Chlorobutyl Rubber Using 4,4′-Bis (Maleimido) Diphenyl Methane

Cited by 5 publications

References 0 publications

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

Manifestation of Waste Silicate Type Additives and Electron Beam Irradiation on Properties of Sbr/devulcanized Waste Tire Rubber Composites for Floor Tiles Applications

Rheometer Evidences for the Co-Curing Effect of a Bismaleimide in Conjunction with the Accelerated Sulfur on Natural Rubber/Chloroprene Rubber Blends

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