Preparation and properties of fluorosilicone and fluorosilicone elastomer with various contents of trifluoropropyl groups

Chen, Yan; Jiang, Wenge; Li, Dongmei; Niu, Chengqun; JieZHANG,; Feng, Shengyu

doi:10.1515/epoly.2011.11.1.302

Cited by 13 publications

(5 citation statements)

References 18 publications

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“…Fluorine‐containing polysiloxanes have drawn much attention by virtue of their remarkable properties compared to polydimethylsiloxane (PDMS), including low surface tension, oil resistance and solvent resistance 1, 2. They have been widely used in many fields, such as automobiles, aircraft, astronavigation, petrochemicals, machinery, artificial organs, etc 3–6…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Removal of Soot: Unravelling of the Reaction Mechanism by EPR and in situ FTIR Spectroscopy

et al. 2012

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Photocatalytic soot oxidation is studied on P25 TiO(2) as an important model reaction for self-cleaning processes by means of electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectroscopy. Contacting of carbon black with P25 leads on the one hand to a reduction of the local dioxygen concentration in the powder. On the other hand, the weakly adsorbed radicals on the carbon particles are likely to act as alternative traps for the photogenerated conduction-band electrons. We find furthermore that the presence of dioxygen and oxygen-related radicals is vital for the photocatalytic soot degradation. The complete oxidation of soot to CO(2) is evidenced by in situ FTIR spectroscopy, no intermediate CO is detected during the photocatalytic process.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Removal of Soot: Unravelling of the Reaction Mechanism by EPR and in situ FTIR Spectroscopy

et al. 2012

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“…However, the experiment in this paper shows that the introduction of NMP in bulk polymerization may lead to the randomization of polymers and thus cause the disappearance of crystal peak. In addition, it can be seen from Table that T g of the polymer does not change significantly with the increase of the TFVE content in the polymer, which may be due to the chain structure changes caused by the introduction of TFVE in the polymer are not enough to cause the change of T g of the polymer …”

Section: Resultsmentioning

confidence: 95%

Synthesis of polysiloxanes containing trifluoroethylene aryl ether groups: The effect of promoters

Yuan

Diao

Zhao

et al. 2020

Polymers for Advanced Techs

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Polysiloxanes with high molecular weight (M n > 100 000, M w /M n < 2.2) containing various quantity of trifluoroethylene aryl ether groups were prepared by anion ring opening polymerization (AROP) in the presence of promoters including N,Ndimethylformamide (DMF) and N-methyl pyrrolidone (NMP). The structures of monomers and polymers were characterized by FTIR and NMR. It was found that the addition of promoter could significantly increase the polymerization rate, decrease the polymerization temperature, and increase the molecular weight of the polymer.When DMF as the promoter, the optimal conditions for polymerization were as follows: The polymerization temperature is 100 C, the amount of catalyst is 2.0%, and the molar ratio of promoter to catalyst is 160:1. The optimal conditions for polymerization using NMP as the promoter were as follows: The polymerization temperature is 75 C, the amount of catalyst is 2.0%, and the molar ratio of promoter to catalyst is 70:1, which indicated that NMP is more effective on AROP than DMF. Thermogravimetric analysis (TGA) showed that the polymer has good heat temperature resistance. Differential scanning calorimetry (DSC) showed that the introduction of NMP in bulk polymerization could improve the randomness of polymer structure, which leads to the disappearance of crystal peak and improve the low temperature resistance of polymer. K E Y W O R D S alkali catalytic system, anion ring opening polymerization, polysiloxane, promoter, trifluorovinyl aryl ether group 1 | INTRODUCTION Perfluorocyclobutyl (PFCB) polymer is a novel class of semifluorinated polymers first reported by Babb et al 1 in 1993. PFCB polymers are mainly prepared by the [2π + 2π] thermocyclization of trifluoroethylene aryl ether (TFVE) monomer. 2 Recently, PFCB polymers have attracted extensive attention of researchers in various fields including electronics industry, 3-7 aerospace, 8 fuel cells, 9-13 optical waveguide materials, 14-16 and coatings 17 because of the unique properties such as low dielectric property, low hygroscopicity, high thermal stability, chemical solvent resistance, and low birefringence. However, most of the research interests are focused on the functionality of PFCB group. There are few researches about the thermocyclization of TFVE monomer.Silicone rubber is one of the largest and most widely used organosilicon products. The traditional vulcanization methods of silicone rubber mainly include the following three categories: peroxide vulcanization, hydrosiloxane vulcanization, and functional group condensation vulcanization. Peroxide vulcanization is described that vinyl polysiloxane is cured by radical reaction using peroxides as the initiators to form a cross-linked network. However, the residues of peroxide decomposition have negative effects on the properties of silicone

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“…The thermogravimetric analysis of all of the fluorosilicone samples, in an inert atmosphere, presents only one decomposition stage that begins around 440 °C and ends at approximately 560 °C (Figure h). The thermal and nonoxidative decomposition of FSE is well-documented, reporting that a cyclization of the main chain occurs, forming cyclosiloxane monomers with three or four Si-O groups. ,,− Side-chain breakdown can also occur, releasing difluoro- and trifluoropropene. , It is interesting to observe that when adding a filler to the FSE matrix there is an effective displacement of the decomposition range toward higher temperatures (Table ). This fact indicates an improvement in the thermal stability of the polymer in the presence of graphene nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

Aguila-Toledo,

Maldonado-Magnere,

Yazdani-Pedram

et al. 2023

ACS Appl. Polym. Mater.

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In this work, we develop fluorosilicone elastomer (FSE) compounds with advanced properties by incorporating graphene oxides functionalized with vinyltrimethoxysilane (GO-V) and allyl isocyanate (GO-A). The morphology and structure of the graphene oxides were characterized confirming the successful functionalization, with contents of functional groups of 9.80 and 3.60% for GO-V and GO-A, respectively. The strong elastomer–graphene oxide interaction accelerates the crosslinking reaction and causes an important enhancement of the mechanical properties and thermal stability of composites. In addition, the swelling resistance to acid, base, and organic solvents is improved by more than 30%. These functional properties make FSE/GO composites a promising new class of advanced materials, expanding their potential application in edge technologies, spanning the manufacture of automotive components, aerospace and aviation parts, oil, gas, and petrochemical components, among others, particularly, seals, gaskets, valves and pipelines, or different components exposed to oil or solvent and high temperatures that require higher performance compared to conventional FSE products.

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Preparation and properties of fluorosilicone and fluorosilicone elastomer with various contents of trifluoropropyl groups

Cited by 13 publications

References 18 publications

Photocatalytic Removal of Soot: Unravelling of the Reaction Mechanism by EPR and in situ FTIR Spectroscopy

Photocatalytic Removal of Soot: Unravelling of the Reaction Mechanism by EPR and in situ FTIR Spectroscopy

Synthesis of polysiloxanes containing trifluoroethylene aryl ether groups: The effect of promoters

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

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