Comparison between mechanical properties of aged and unaged silicone rubbers filled with titanium dioxide, quartz, aluminium silicate and vulkasil (s type)

Zahedi

J of Applied Polymer Sci

et al. 2010

In this work, the effective parameters in liquid polysulfide curing system were optimized by D-optimal design method. Five main components in the formulation, carbon black, vulcanizing agents (MnO 2 , Na 2 Cr 2 O 7 , and PbO 2 ), CaCO 3 , fumed silica, and chlorinated paraffin, were selected. Mechanical and chemical properties of the samples were investigated. The results showed that tensile strength, hardness, viscosity, and optimum cure time (t 90 ) presented a suitable coordination with reduced quadratic model. For elongation at break and swelling tests, reduced two-factor interaction (2FI), and for peel strength, a linear model showed the best correlation. To achieve the desirable properties for liquid polysulfide sealants used in fuel tanks, an optimized amount of the above components in the formulation were used. Finally, MnO 2 curing system, compared with Na 2 Cr 2 O 7 and PbO 2 , was selected as the best choice.

Section: Resultsmentioning

confidence: 92%

Optimized formulation of an oxidative curing system for liquid polysulfide sealants used in fuel tanks by D‐optimal design method

Zahedi

J of Applied Polymer Sci

et al. 2010

“…When the content of BT was increased to 10 parts, the aggregation of nanosilica was not observed on the surface with an increase of aging time, suggesting that the incorporation of BT can effectively inhibit the migration of silica. The presence of BT could capture the oxidation free radicals in hot air, which greatly reduces the fracture of the main chain and effectively improves the quality of the SR composites 32, 33 …”

Section: Resultsmentioning

confidence: 99%

Investigations of the improved performances of silicone rubber in the presence of black titanium

Zhang¹,

Jiang²

2021

Polymer International

Silicone rubber (SR)/black titanium (BT) composites with high‐temperature resistance and thermal conduction were prepared via an efficient and convenient blending method. The thermal stability and conductivity of these materials, as well as their properties were systematically investigated to determine the effects of BT. As tensile testing showed, the elongation retention rate of SR‐10 described good antioxidation behavior with a value of 30% after aging at 250 °C for 360 h. Additionally, thermal stability was improved with the introduction of BT. The initial decomposition temperature and maximum degradation rate temperature increased by 200 and 23 °C, respectively, in air atmosphere. As is known, it is difficult for inorganic particles to be well dispersed in a polymeric matrix. However, as observed using scanning electron microscopy, BT displayed a good compatibility and dispersion in the SR matrix without any obvious agglomeration. Moreover, it was found that the addition of BT can further enhance the thermal conductivity of SR to 0.48 W m−1 K−1. © 2021 Society of Industrial Chemistry.

J of Applied Polymer Sci

“…Fei et al prepared heat‐resistant SR which was thermally stabilized by α‐Fe 2 O 3. 26 In other investigations, alumina fiber 27 and TiO 2 28,29 have also been found to effectively reinforce the thermal stability of LSR. However, the reduced mechanical strength of LSR brought by thermal stable fillers also limits the application of these fillers 29 .…”

Section: Introductionmentioning

confidence: 85%

“… 26 In other investigations, alumina fiber 27 and TiO 2 28,29 have also been found to effectively reinforce the thermal stability of LSR. However, the reduced mechanical strength of LSR brought by thermal stable fillers also limits the application of these fillers 29 . Therefore, it is highly desirable to achieve the reinforcement of LSR mechanical properties while enhancing its thermal stability at elevated temperatures.…”

Section: Introductionmentioning

confidence: 85%

Preparation and characterization of red mud/liquid silicon rubber with good thermal‐stability and processability

Wang

Qin

Liu

et al. 2023

As reported herein, a novel addition‐type liquid silicone rubber (LSR)/red mud (RM) composite has been synthesized. Triethoxyvinylsilane (KH151) was used as a surface modification agent to treat RM and form hydrophobic surfaces. The optimal formulation of the composite was determined by the mechanical properties of the LSR that were prepared at different crosslinker and filler contents. The reinforcement mechanism of modified RM on LSR was revealed by combining Fourier transform infrared (FTIR) spectroscopy, x‐ray photoelectron spectroscopy and mechanical property tests. Thermal degradation behavior of RM/LSR at elevated temperature was investigated by the thermogravimetric analysis (TG), TG‐FTIR and alteration of mechanical properties after thermal aging. The results of the experiment indicate that modified RM increased the tensile strength and Young's modulus of LSR dramatically and provides superior thermal stability to the LSR. With 100 phr RM added, the tensile strength of RM/LSR composite was almost 12 times greater than that of pure LSR, and pure LSR degrades completely after aging at 300°C for 24 h while RM/LSR retains its mechanical properties.