Curing characteristics, morphology, thermal stability, mechanical properties, and irradiation resistance of methylethylsilicone/methylphenylsilicone rubber blends

Ma, Depeng; Tan, Jinglin; Li, Yuling; Bian, Chao; Wang, Guogang; Feng, Shengyu

doi:10.1002/app.40529

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…2(c). In general, the difference value (M H -M L ) between the maximum torque (M H ) and the minimum torque (M L ) is related to the cross-linking density29. M H -M L of the samples increased with the increasing of DCP content as shown in Fig.…”

Section: Resultsmentioning

confidence: 91%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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Sulfur (S) cross-linking styrene butadiene rubber (SBR) foams show high shrinkage due to the cure reversion, leading to reduced yield and increased processing cost. In this paper, double cross-linking system by S and dicumyl peroxide (DCP) was used to decrease the shrinkage of SBR foams. Most importantly, the synergy of double cross-linking agents was reported for the first time to our knowledge. The cell size and its distribution of SBR foams were investigated by FESEM images, which show the effect of DCP content on the cell structure of the SBR foams. The relationships between shrinkage and crystalline of SBR foams were analyzed by the synergy of double cross-linking agents, which were demonstrated by FTIR, Raman spectra, XRD, DSC and TGA. When the DCP content was 0.6 phr, the SBR foams exhibit excellent physical and mechanical properties such as low density (0.223 g/cm3), reduced shrinkage (2.25%) and compression set (10.96%), as well as elevated elongation at break (1.78 × 103%) and tear strength (54.63 N/mm). The results show that these properties are related to the double cross-linking system of SBR foams. Moreover, the double cross-linking SBR foams present high electromagnetic interference (EMI) shielding properties compared with the S cross-linking SBR foams.

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Section: Resultsmentioning

confidence: 91%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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“…Polymer blend methods are also used to improve the mechanical properties of rubbers . For the blends of SR, siloxane‐based polymers, ethylene vinyl acetate, and ethylene–propylene–rubber are reported as partner polymers of SR. SR is usually immiscible with partner polymers and the blends exhibit two‐phase systems. When the adhesion at the interface of the two‐phases is poor, physical, and mechanical properties become worse by blending.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties and interfacial adhesion of silicone rubber/polyethylene blends by reactive blending

Morishita

Saito

2018

J of Applied Polymer Sci

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Two-phase blends of silicone rubber (SR) and linear low density polyethylene (LLDPE) were prepared by reactive blending using peroxide crosslinking agent of SR. The tensile strength and elastic modulus of the SR were found to be increased by reactive blending with LLDPE without sacrifice of the elongation. The improvement of the tensile properties is attributed to the strong adhesion at the interface between SR matrix and LLDPE domain due to the chemical reaction by peroxide. The observation by polarized optical microscopies revealed that the debonding did not occur at the interface, but the LLDPE domains were elongated to longer one. Despite the elongation of the LLDPE domain, the blends exhibited good deformation recoverability. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46192.

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“…Both the tensile strength and elongation at break were significantly decreased. At the initial stage, the downtrend was more obvious, which was mainly due to the degradation of bulky SR materials under thermal‐oxidative aging 31,32 . With aging time increased, the decreased tendency was slowed down, but the elongation at break continuously declined.…”

Section: Resultsmentioning

confidence: 99%

“…At the initial stage, the downtrend was more obvious, which was mainly due to the degradation of bulky SR materials under thermal-oxidative aging. 31,32 With aging time increased, the decreased tendency was slowed down, but the elongation at break continuously declined. The deterioration in tensile properties after aging was normally related to both the molecular chain scission and the coexisted cross-linking between radicals and oxygen.…”

Section: Mechanical Performancementioning

confidence: 99%

Thermal aging properties of flame retardant silicone rubber based on melamine cyanurate

Zhou

Wang

et al. 2020

J of Applied Polymer Sci

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In this work, an efficient preparation method for flame retardant silicon rubbers (FRSR) was established with using melamine cyanurate (MCA) as flame retardants. In order to analyze the thermal aging mechanisms and flame retardancy of FRSR, cone calorimetric test (CCT), Fourier transform infrared (FTIR) spectra, scanning electronic microscopy (SEM), and energy dispersive X-ray spectra were performed. Results indicated that the aging time significantly decreases the tensile strength and the elongation at break. SEM images revealed that the porous surface of the aged FRSR provide diffusion path for heat and oxygen, which resulted in a continuously increase in Shore A hardness due to the increase of cross-linking density during the aging process. FTIR spectra further proved that the MCA is well-embedded into samples and crosslinking reaction between free radicals of silicone rubber (SR) and oxygen was occurring during the aging process. Besides, CCT results showed that all FRSR samples before and after thermal aging exhibit excellent flame retardancy with compact and stable char residue layers, effectively hindering the heat transfer and oxygen diffusion. It was expected that our findings could provide important information to fabricate SR with flame retardancy and outstanding longterm thermal-aging resistance. K E Y W O R D S ageing, degradation, mechanical properties, thermal properties 1 | INTRODUCTION Compared with general organic rubbers, silicone rubber (SR) shows excellent temperature resistance, electrical insulation, high breathability, dielectric properties, and weather resistance due to its Si-O bond on main chain with side groups including methyl, vinyl, and phenyl. 1-5 Over the past decades, SR materials have been widely used in various areas, such as medical and health, aerospace, wire and cable, automotive industry, architecture, and so on. 6-8 However, SR is flammable and can keep burning when exposed to open flames, which limits its application in the field of electronic appliances.

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Curing characteristics, morphology, thermal stability, mechanical properties, and irradiation resistance of methylethylsilicone/methylphenylsilicone rubber blends

Cited by 10 publications

References 34 publications

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Tensile properties and interfacial adhesion of silicone rubber/polyethylene blends by reactive blending

Thermal aging properties of flame retardant silicone rubber based on melamine cyanurate

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