Effects of Hydrothermal Treatment on the Structure and Properties of Aviation Polysulfide Sealant

Abstract:

An aviation polysulfide sealant has been soaked in a water bath at 85 °C to study the effects of hydrothermal treatment on this material. The morphology, Shore A hardness, and mechanical properties of the sealant were measured before and after soaking. The glass transition temperature (Tg) and room temperature storage modulus (E') were measured by means of a dynamic mechanical analyzer (DMA). The results showed that the surface glossiness of the polysulfide disappeared, some bubble defects appeared on its surface, the Shore A hardness and the tensile strength increased, while the elongation at break fluctuated with aging. The Tg and E' of the sealant changed only slightly. The chemical structure of the sealant was not obviously changed, and its aggregation state was changed only slightly, thus indicating that this sealant is characterized by good hydrothermal resistance.

• Periodical: Advanced Materials Research (Volume 621)
• Pages: 87-92
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.621.87
• Online since: December 2012
• Authors: Jiang Yan Meng, Yun Ying Wang
• Keywords: Aviation Polysulfide Sealant, Dynamic Mechanical Analysis (DMA), Glass Transition Temperature (T_g), Hydrothermal Aging, Room Temperature Storage Modulus (E')

References

[1] Y. L. Zhang., M. Sun. Manual of Rubber Varieties and Performance [M]. Beijing: Chemical Industry Press, 2007, pp.262-263.

[2] M. M. Sun., B. Zhang., X. G. Zhang., et al. Development of high-temperature-resistant and low-density polysulfide sealants [J]. Conference of the China Aviation Society, vol. 27, (2007), pp: 1-7.

[3] S. D. Cao. Effect on the performance of molecular weight distribution and molecular weight of liquid polysulfide sealants with -SH end-groups [J]. Rubber Industries, 2 (1993), pp：77-81.

[4] X. W. Zhang. Modified polysulfide hollow-glass sealants [J]. Elastomer, vol. 11, no. 5, (2001), pp: 3741.

[5] J. B. Yan. Modification of the polysulfide sealants [J]. World Rubber Industries, vol34, no12, (2007), pp: 23-25.

[6] Y. Q. Lin, L. C. Nie, R. Y. Liu, et al. Research on the effective and mildew-proof polysulfide sealant [J]. Material Engineering, no. 7, (2007), pp: 44-47.

[7] G. Liu., P. B. Qin., S. H. Wu. Research on brand-new high-temperature-resistant and oil-resistant sealants [J]. China Adhesives, vol. 18, no. 8, (2009), pp: 36-38.

[8] M. M. Sun., B. Zhang., X. G. Zhang., et al. Effect of fillers on the performance of polysulfide sealants [J]. Chemistry and Adhesion, 2010, vol. 32, no. 01: pp: 9-12.

[9] Y. Y. Wang., J. Y. Meng. Effect of Thermo-oxidative Ageing on Aviation Polysulfide Sealants [J]. Applied Mechanics and Materials, vols. 152-154 (2012) , pp: 28-33.

DOI: 10.4028/www.scientific.net/amm.152-154.28

[10] S. H. Wu., X. S. Yi., P. B. Qin., et al. Aging mechanism of polysulfide sealants soaked in aviation kerosene [J]. Journal of Aeronautical Materials, vol. 27, no. 6(2007), pp: 79-82.

[11] T. W. Andreas. RILEM TC190-SBJ: Development of recommendation on novel durability test methods for wet-applied curtain-wall sealants [J]. Material and Structures, vol. 41, (2008) pp: 1473-1486.

DOI: 10.1617/s11527-008-9418-2

[12] RILEM Technical Committee (T. W. Andreas). Recommendation of RILEM TC190-SBJ: Service-life prediction of sealed building and construction joints [J]. Material and Structures, Vol. 41, (2008) , pp: 1497-1508.

DOI: 10.1617/s11527-008-9420-8

[13] W. J. Hu., Z. F. Liu., Y. M. Chen. Thermo-oxidative accelerated aging and service-life predicting modes for rubber [J]. Rubber Industries, no. 100, (2004) , pp: 42-46.

[14] K. Zhang., Y. H. Huang, Y. Ma, et al. Accelerated aging and service-life predicting modes for rubber [J]. Chemical Propellant and Polymer Materials, no. 06, (2004), pp: 44-48.

[15] J. A. Zhong., Q. M. Zhong., Y. B. Chen. Experimental studies on aging life of the o-ring of rubber [J]. Synthetic Materials: Aging and Applications, 1998, 1: 1-4.