Preparation and properties of ceramifiable flame-retarded silicone rubber composites

Lou, Feipeng; Wei, Yan; Guo, Weihong; Wei, Ting; Li, Qiuying

doi:10.1007/s10973-017-6448-4

Cited by 50 publications

(21 citation statements)

References 37 publications

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“…Table 6 showed dimensional changes of samples with different contents of Pt/BTA when heat‐treated at 600°C, 800°C, and 1000°C. Samples gradually shrunk as the temperature increased, which was because melted glass had penetrated into the matrix and co‐reacted with other inorganic components as XRD results conveyed 2,29 . (Pt/BTA)‐1, (Pt/BTA)‐2 and (Pt/BTA)‐3 had a smaller shrinkage at both 600°C and 800°C than (Pt/BTA)‐0.…”

Section: Resultsmentioning

confidence: 99%

Effect of benzotriazole‐protected platinum catalyst on flame retardancy and ceramic‐forming property of ceramifiable silicone rubber

Jiang

Zhou

Liao

2020

Polymers for Advanced Techs

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The high-performance ceramifiable silicone rubber was prepared by adding Karstedt's Catalyst which was protected by a complexing agent of benzotriazole, Pt/BTA, to the system of silicone rubber (SR)/aluminum hydroxide (ATH)/ZrSiO 4 /glass dust. In this work, effect of Pt/BTA on flame retardancy and ceramic-forming property of ceramifiable silicone rubber and its mechanisms were investigated. When Pt/BTA content was 1137.75 ppm, Pt/BTA/SR/ATH/ZrSiO 4 passed UL-94V-0 rating and SR/ATH/ZrSiO 4 cannot be rated in the vertical burning test. The total heat release and total smoke production were significantly reduced when Pt/BTA was added. Pt/BTA/SR/ATH/ZrSiO 4 composite can support its own weight when heat-treated at 600 C, 800 C, and 1000 C and three-point flexural strength of ceramics increased to 29.47 MPa, which was 102.68% higher than that of SR/ATH/ZrSiO 4 When Pt/BTA content was 1137.75 ppm. The flame-retardant mechanism is discussed via Thermogravimeter-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy spectra. A three-dimensional network in residues is formed and dramatic depolymerization of polymer backbone can be controlled when Pt/BTA is added in composites. With the addition of Pt/BTA, increased carbon content and formed Si C and C C in residues enhence the quality of char layer, isolating heat and oxygen much more efficiently.

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Section: Resultsmentioning

confidence: 99%

Effect of benzotriazole‐protected platinum catalyst on flame retardancy and ceramic‐forming property of ceramifiable silicone rubber

Jiang

Zhou

Liao

2020

Polymers for Advanced Techs

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“…The flammability and thermal stability properties of ceramifying SR composites were studied by TG analysis. Commonly, the thermal degradation of neat SR includes two steps . The TG curves of SR composites and the corresponding derivative TG (DTG) curves under the nitrogen atmosphere were shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Study of flame‐retarded silicone rubber with ceramifiable property

Liang

Shan

et al. 2019

Fire and Materials

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Summary Fire‐resistant ceramifiable silicone rubber composites with excellent comprehensive property were prepared in this paper. Silicone rubber was used as the base polymer, aluminum hydroxide, magnesium hydroxide, zinc borate, and glass frits were additives. The flammability and thermal stability properties, essentially focusing on the use of the limiting oxygen index and thermogravimetric analysis, were all studied. Besides, the ceramic residues were also studied by mechanical testing, scanning electron microscopy, and X‐ray diffraction. The ceramifying silicone rubber could achieve a limiting oxygen index value of 34.8%, and the flexural strength of ceramic residues formed at 800°C was 9.7 MPa. The residue of composites was approximately 58.6% at 700°C, which is significantly higher than that of neat silicone rubber. The scanning electron microscopy analysis depicted that a dense structure was formed as formed.

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“…Ceramifiable polymer composites play important roles in the field of thermal protection systems (TPS) for rocket motor cases, due to their advantages of low density, low heat conduction, excellent mechanical properties and ablation resistance [1,2]. The ceramifiable polymer composites for TPS include fiber reinforced phenolic resin composites [3][4][5], ceramifiable EPDM composites [6][7][8][9] and ceramifiable silicone rubber composites [10][11][12]. During the process of ablation, the residue of decomposed silicone rubber is loose and weak, and can be peeled off from the ablation surface under the erosion of high-speed airflow, resulting in deeper ablation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zirconium Silicide on the Vulcanization, Mechanical and Ablation Resistance Properties of Ceramifiable Silicone Rubber Composites

et al. 2020

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Ceramifiable silicone rubber composites play important roles in the field of thermal protection systems (TPS) for rocket motor cases due to their advantages. Ceramifiable silicone rubber composites filled with different contents of ZrSi2 were prepared in this paper. The fffects of ZrSi2 on the vulcanization, mechanical and ablation resistance properties of the composites were also investigated. The results showed that the introduction of ZrSi2 decreased the vulcanization time of silicone rubber. FTIR spectra showed that ZrSi2 did not participate in reactions of the functional groups of silicone rubber. With the increasing content of ZrSi2, the tensile strength increased first and then decreased. The elongation at break decreased and the permanent deformation increased gradually. The thermal conductivity of the composite increased from 0.553 W/(m·K) to 0.694 W/(m·K) as the content of the ZrSi2 increased from 0 to 40 phr. In addition, the thermal conductivity of the composite decreased with the increase of temperature. Moreover, thermal analysis showed that the addition of ZrSi2 increased the initial decomposition temperature of the composite, but had little effect on the peak decomposition temperature in nitrogen. However, the thermal decomposition temperature of the composite in air was lower than that in nitrogen. The addition of ZrSi2 decreased the linear and mass ablation rate, which improved the ablative resistance of the composite. With the ZrSi2 content of 30 phr, the linear and mass ablation rate were 0.041 mm/s and 0.029 g/s, decreasing by 57.5% and 46.3% compared with the composite without ZrSi2, respectively. Consequently, the ceramifiable silicone rubber composite filled with ZrSi2 is very promising for TPS.

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Preparation and properties of ceramifiable flame-retarded silicone rubber composites

Cited by 50 publications

References 37 publications

Effect of benzotriazole‐protected platinum catalyst on flame retardancy and ceramic‐forming property of ceramifiable silicone rubber

Effect of benzotriazole‐protected platinum catalyst on flame retardancy and ceramic‐forming property of ceramifiable silicone rubber

Study of flame‐retarded silicone rubber with ceramifiable property

Effects of Zirconium Silicide on the Vulcanization, Mechanical and Ablation Resistance Properties of Ceramifiable Silicone Rubber Composites

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