Effect of temperature on the storage life of polysulfide aircraft sealants

Barber, John W; Hanhela, Peter J.; Huang, Robert H. E.; Paul, D. B.

doi:10.1016/0142-9418(90)90002-u

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…2,3 Liquid polysulfide polymers (Thiokols LP) have been widely used in the aerospace sealant industry as sealing materials since 1940s, 4 which due to their ideal resistance to chemical solvents, especially fuel oil. 5 Currently, commercial aircraft fuel tank sealants such as PR1750 or CS540 6 are mainly prepared by blending liquid polysulfide with a metal peroxide curing agent, which forms curing cross-linking by converting -SH groups into S-S bonds/linkage. 7,8 Unfortunately, the extremely poor mechanical properties difficultly withstood the loads from wing or tanks, causing oil spills in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Strengthening the mechanical properties of polysulfide adhesives by introducing polyurethane

Han,

Li,

et al. 2023

J of Applied Polymer Sci

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Polysulfide adhesives are often subjected to breakage or even fracture caused by highly loaded vibrations and large deformations from the wing, limiting their practical use in aircraft fuel tanks. Inserting polyurethanes into liquid polysulfide systems is a viable approach to strengthening their mechanical properties and avoiding nonuniform dispersion of the curing agent. In this contribution, a series of sulfur‐containing curing agents were prepared by liquid polysulfide and trimethylolpropane tris(3‐mercapto propionate) (TMPMP) to minimize the effect of the polysulfide‐urea (‐NHCOS‐) groups on water resistance. Subsequently, the two‐component polysulfide adhesives were successfully synthesized via the prepolymerization method, and their chemical structure, mechanical properties, and solvent resistance were systematically evaluated. As expected, the large introduction of sulfur linkages and ‐NHCOS‐ groups provided excellent oil resistance and strong mechanical properties for polysulfide adhesives. Notably, Samples 2‐4 exhibited the highest tensile strength of 1.11 ± 0.02 MPa, the greatest shear strength of 1.87 ± 0.04 MPa, and the best hardness of 81 ± 2 Shore A, with 122.0%, 523.3%, and 170.0% improvement over the control, respectively. Furthermore, the oil absorption rate of all samples was less than 3.0%, and their tensile strength remained almost unchanged after 30 days of immersion than before. We believe our paradigm can provide a valuable guideline for designing high‐performance polysulfide adhesives.

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Section: Introductionmentioning

confidence: 99%

Strengthening the mechanical properties of polysulfide adhesives by introducing polyurethane

Han,

Li,

et al. 2023

J of Applied Polymer Sci

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“…The polysulfide epoxy resin-based concrete used in this study (hereinafter referred to as "polysulfide polymer concrete") has a high strength and good resistance to wear, sliding, and UV rays [5][6][7][8]. It is frequently used for restoring bridge decks, constructing floors, and paving roads; in such overlay applications, this material is useful because it prevents the permeation of moisture, chlorides, and corrosive materials through the overlays [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Curing Conditions on the Strength Properties of Polysulfide Polymer Concrete

Hong

2017

Applied Sciences

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Abstract:In this study, the effects of curing temperature and curing time on the mechanical properties of polysulfide polymer concrete were investigated. For this purpose, several laboratory tests were conducted to measure the compressive, flexural, and bond strengths of the concrete. The ranges of curing temperature and curing time considered were −10-60 • C and 3-672 h (28 days), respectively. The test results show that a curing temperature above 20 • C adversely affects the strength of the concrete. Regression equations derived from the test results demonstrate the reliability of the results for the estimation of flexural and bond strengths from a given value of compressive strength.

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Polysulphides in the construction industry

Irfan¹

1998

Chemistry and Technology of Thermosetting Polymers in Construction Applications

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Effect of temperature on the storage life of polysulfide aircraft sealants

Cited by 4 publications

References 11 publications

Strengthening the mechanical properties of polysulfide adhesives by introducing polyurethane

Strengthening the mechanical properties of polysulfide adhesives by introducing polyurethane

Influence of Curing Conditions on the Strength Properties of Polysulfide Polymer Concrete

Polysulphides in the construction industry

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