Enhanced ablation resistance of Divinyl‐POSS modified additional liquid silicone rubber and its fiber reinforced composite

Abstract

To further improve the ablation and thermal properties of silicon rubber composite materials, the 3, 13-divinyloctaphenyl double-decker polyhedral oligomeric silsesquioxane (DV-DDSQ) modified additional vinyl-terminated polydimethylsiloxane (VPDMS) was prepared, and the effect of high silica fiber reinforcement on the ablation properties of VPDMS was investigated. The results show that when 0.8phr DV-DDSQ was added, the mass residual rate at 800 C of the composites increased from 40.6% to 51.0%. The linear ablation rate (LAR) as well as mass ablation rate (MAR) of the composites of the DV-DDSQ modified VPDMS, the high silica fiber reinforced VPDMS composite (HSF/VPDMS composite) and the high silica fiber reinforced DV-DDSQ modified VPDMS composite (HSF/DV-DDSQ-VPDMS composite) decreased dramatically compared with raw VPDMS, and it was 16.36%, 35.69%, and 37.17% bring down for LAR and 5.34%, 14.60% and 25.59% for MAR, respectively. The tensile strength and hardness of the DV-DDSQ modified composites increased by 9.52% and 14.13%, respectively, while the elongation at break decreased by 5.99%, compared with the raw VPDMS.

Aramid pulp modified with imidazolium ionic liquids as a potential replacement for carbon black in fluorinated rubber composites

“…Depending on the salt type, different chemical interactions are expected, due to the different functional groups present in both salt and polymer matrix. [ 3,19,24,25 ]…”

“…Depending on the salt type, different chemical interactions are expected, due to the different functional groups present in both salt and polymer matrix. [3,19,24,25] Indeed, the use of IL for fiber treatment and improvement of interfacial adhesion in polymeric composites is a new technology. However, new routes, techniques and the investigation of new polymers to be used as matrices for these fibers are still lacking in literature.…”

Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

“…In recent studies, polyhedral oligomeric silsesquioxane (SQ) molecule emerges as a novel hybrid modifier to facilitate the dispersion of montmorillonite clay, a layered silicate with geometries similar to those of LDHs, in thermoplastic matrices and elastomer composites because of the shape rigidness and bulky character of cage-like silica core. [30][31][32] Silsesquioxane cages possess a characteristic size of about 1.5 nm, dimensionally larger than regular montmorillonite interlayer spacing. In this modification system, SQ-embedded organoclays usually exhibit an expanded interlayer region, enabling easy insertion of polymer chains.…”

Nylon 66 fibers coated with environmentally friendly dopamine‐modified adhesives and their interfacial adhesion with neoprene rubber

“…Rubber matrix can be reinforced with steel cords or polymer fiber cords 10,11 . Nylon fiber is one of the common polymer cords used in fiber‐reinforced rubber composites 12,13 owing to its excellent mechanical properties, heat, and wear resistance 14,15 .…”

“…8,9 Rubber matrix can be reinforced with steel cords or polymer fiber cords. 10,11 Nylon fiber is one of the common polymer cords used in fiber-reinforced rubber composites 12,13 owing to its excellent mechanical properties, heat, and wear resistance. 14,15 However, nylon fiber and rubber matrix have poor adhesion because of their incompatible physical and chemical structures.…”