Elastomeric composites based on propylene oxide rubber and ultrafine polytetrafluoroethylene for operation in cold climates

Portnyagina, V. V.; Petrova, Н.; Mukhin, V.V.; Morozov, A V

doi:10.1016/b978-0-12-821873-0.00012-6

Cited by 3 publications

(3 citation statements)

References 22 publications

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Section: Resultsmentioning

confidence: 99%

“…This phenomenon is attributed to the increased level of NQ-matrix adhesion present in SLTP samples, which facilitates greater stress distribution and results in reduced debonding, NQ pullouts, and deformation. 23 The triple-base propellant samples manufactured through the two distinct molding processes exhibit divergent microscopic morphologies and spatial arrangements. As depicted in Fig.…”

Section: Macroscopic Physicochemical Parametersmentioning

confidence: 99%

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Advanced fabrication approach for innovative triple base propellants with enhanced continuous fracture resistance

Zhu,

Fu,

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Macroscopic Physicochemical Parametersmentioning

confidence: 99%

Advanced fabrication approach for innovative triple base propellants with enhanced continuous fracture resistance

Zhu,

Fu,

et al. 2023

RSC Adv.

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show abstract

“…Khan et al [24,25] and Cao et al [26] report that high-energy irradiation reduces the energy required to produce PTFE powder from its waste and results in a powder that does not agglomerate. Portnyagina et al [31] show that the introduction of ultrafine polytetrafluoroethylene into propylene oxide rubber leads to a decrease in the coefficient of friction and an improvement in the wear resistance of the material by 21%. In addition, elastomeric composites containing 50 phr ultrafine PTFE perform stably under wear conditions over a wide range of loads and sliding speeds at a temperature of −25 • C [31].…”

Section: Introductionmentioning

confidence: 99%

Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Ayurova,

Kornopoltsev,

Khagleev

et al. 2024

Lubricants

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Advancements in industrial machinery and manufacturing equipment require more reliable and efficient polymer tribo-systems which operate in conditions associated with increasing machine speeds and a lack of cooling oil. The goal of the current research is to improve the tribological properties of elastomeric composites by adding a solid lubricant filler in the form of ultrafine polytetrafluoroethylene (PTFE) with the chemical formula [C2F4]n and recycled polytetrafluoroethylene (r-PTFE) powders. PTFE waste is recycled mechanically by abrasion. The elastomeric composites are prepared by mixing a nitrile butadiene rubber with a phenol-formaldehyde resin and PTFE powders in an extruder followed by rolling. The deformation-strength and tribological tests of r-PTFE elastomeric composites are conducted in comparison with the ultrafine PTFE composites. The latter is based on products of waste fluoropolymer processing using a radiation method. The deformation-strength test shows that the introduction of ultrafine PTFE and r-PTFE powder to the composite leads to a decrease in strength and elongation at break, which is associated with the poor compatibility of additives and the elastomeric matrix. The friction test indicates a decrease in the coefficient of friction of the composite material. It is determined that the 15 wt.% filler added in the elastomeric matrix leads to a reduction in the wear rate by 20%. The results obtained show the possibility of using ultrafine PTFE powder and r-PTFE for creating elastomeric composites with increased tribological properties. These research results are beneficial for rubber products used in many industries, mainly in mechanical engineering.

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Mechanism of the anisotropic nitroguanidine crystal arrangement on triple-base propellant failure by impact and strategy of structural enhancement

Zhu,

Fu,

Wang

et al. 2023

AIP Advances

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Nitroguanidine (NQ) in solvent-based triple-base propellants (STP) has a propensity to peel off and detach from the matrix, leading to significant defects, such as interface debonding within the propellant’s microstructure. This ultimately results in reduced and unstable mechanical properties. To address this critical issue, an efficient and eco-friendly manufacturing process was employed to successfully produce solventless triple-base propellants (SLTPs) as a comparison to conventional STPs. SLTP samples exhibit a mutually supportive three-dimensional spatial structure, with NQ crystals within the propellant matrix more securely bonded to the interface. They also demonstrate higher relative density (1.68 g·cm−3), more stable molding dimensions (no contraction), and enhanced tensile strength (41.92 MPa). Quasi-static structural failure tests reveal that the standard deviation of compressive strength for SLTP samples in three axes is smaller, registering at 1.10. The dynamic structural damage performance analysis indicates that the failure of energetic composite materials is attributable to separation fracture damage after the appearance of cracks on the tensile surface at −40 and 25 °C. Furthermore, the structural failure of these materials occurs due to significant collapse failure after the compression surface bends inward at 50 °C. Consequently, the present study offers a reliable theoretical foundation and procedural strategy for enhancing the structural strength of triple-base propellants.

show abstract

Elastomeric composites based on propylene oxide rubber and ultrafine polytetrafluoroethylene for operation in cold climates

Cited by 3 publications

References 22 publications

Advanced fabrication approach for innovative triple base propellants with enhanced continuous fracture resistance

Advanced fabrication approach for innovative triple base propellants with enhanced continuous fracture resistance

Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Mechanism of the anisotropic nitroguanidine crystal arrangement on triple-base propellant failure by impact and strategy of structural enhancement

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