Comparison of two high temperature treatment methods on preparing electrically conductive polysulfide/Ag composites for aerospace sealant applications

Abstract

High electrical conductivity of aircraft fuel tank sealant is vital to prevent charge accumulation during operation. In this work, we prepare highly conductive polysulfide (PS)/Ag composite (10 6 S m −1) via two thermal treatment methods-namely post cure annealing and high temperature (HT) curing, where the room temperature (RT) cured sample was previously found insulative. The HT cure samples resulted in a milder hardness increase compared to the RT cure-annealed ones. Through various chemical and thermal analyses, a strong coordination of the sulfide components on Ag surfaces is found blocking the electron tunneling pathways at RT, which turns out to be weakened at HT. Post cure annealing causes the decomposition of the coordinated segments and provides intimate contact of Ag particles to support conductivity. HT cure on the other hand prevents the Ag/S coordination in the first place, therefore producing highly conductive PS/Ag composite with softness well maintained which makes it the preferred method for conductive sealant applications.

In Situ Incorporation of Liquid Polysulfide Oligomer Modified MoS2 into Polysulfide Rubber (PSR) as Solid Crosslinker with Greatly Improved Dispersion Ability and Interfacial Interaction

“…But the neat rubber suffers from lack of mechanical properties, adding inorganic fillers to polymers or enhance crosslink density are the most common modification methods. [3][4][5] Among many polymer fillers, layered twodimensional (2D) materials are widely employed as reinforcing agents for polymer materials due to their high specific surface area and excellent physical and chemical properties. [6][7][8] Pirayesh et al [9] prepared composites with excellent thermal stability and enhanced mechanical properties by incorporate amine-functionalized graphene oxide (GO) nanosheets into polysulfide prepolymers.…”

“…But the neat rubber suffers from lack of mechanical properties, adding inorganic fillers to polymers or enhance crosslink density are the most common modification methods. [ 3–5 ] Among many polymer fillers, layered two‐dimensional (2D) materials are widely employed as reinforcing agents for polymer materials due to their high specific surface area and excellent physical and chemical properties. [ 6–8 ] Pirayesh et al.…”

Stereocomplex Crystallization Induced Significant Improvement in Transparency and Stiffness–Toughness Performance of Core‐Shell Rubber Nanoparticles Toughened Poly(l‐lactide) Blends

“…As one of the most significant components for the global real economy, polymers present huge potential in various fields like electronic information, aerospace industry, and biomedicine. [ 1–5 ] However, the large amount of non‐degradable waste generated by the petroleum‐based polymers after use have caused severe environmental issues and sustainable crisis. [ 6–8 ] In this condition, poly( l ‐lactide) (PLLA), as one typical member of bio‐based and biodegradable polymers, has gained a great development opportunity due to its good biocompatible, optical, and mechanical properties.…”