Improved mechanical and flame resistance properties of vinyl ester resin composites by lithium containing polyhedral oligomeric phenyl silsesquioxane

Abstract

The mechanical and flame retardancy properties of vinyl ester resin (VER) composites containing lithium containing polyhedral oligomeric phenyl silsesquioxane (Li-Ph-POSS) are investigated. The bending test suggests that Li-Ph-POSS improves the mechanical property of the matrix. Compared with the pure VER, the bending strength and flexural modulus are improved by 42.9% and 18.9% with the addition of 3 wt% Li-Ph-POSS, respectively. And cone calorimeter test results indicate that Li-Ph-POSS endows the matrix good fire resistance. Three weight percent Li-Ph-POSS makes the heat release rate (HRR) decline by 32.4% compared with the pure VER. Besides, 3 wt% Li-Ph-POSS performs best on smoke suppression and declines the release of CO due to good char-forming effect of Li-Ph-POSS. The improvement of mechanical property and the slightly improved glass transition temperature (Tg) of VER composites confirmed the excellent compatibility between Li-Ph-POSS and the matrix. The flame retardant mechanism is revealed by Thermogravimetric coupled with Fourier transform infrared analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis in detail. The work provides an optional method to prepare flame retarded VER with excellent mechanical properties.

Enhancing Char Formation and Flame Retardancy of Ethylene-Vinyl Acetate Copolymer (EVA)/Aluminum Hydroxide (ATH) Composites by Grafting Ladder Phenyl/Vinyl Polysilsesquioxane (PhVPOSS)

“…Polyhedral oligomeric silsesquioxanes (POSSs) are organic and inorganic hybrid materials with both organic functional groups and inorganic Si-O-Si structures, which usually have good compatibility with polymers and excellent thermal stability [ 17 , 18 , 19 ]. As efficient synergist agents, POSSs can significantly improve flame retardant efficiency without producing harmful gases during processing and reducing the insulation properties of the polymer composites [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Feng et al [ 27 ] partially replaced aluminum diethylphosphonate (ADP) by using octaphenyl polyhedral oligomeric silsesquioxanes (OPS) in PA6, and the peak heat release rate (PHRR) decreased by 60.2%, and the maximum smoke density (Ds max) decreased by 45.9%, when the total addition reached 10%.…”

Enhancing mechanical, thermal property and flame retardancy of optical polythiourethane with self‐assembly phosphazene nanoparticles

“…Recently, high‐performance polymers have developed rapidly. Several strategies for individually enhancing certain properties of materials have emerged; these include adding high strength inorganic nanoparticles and flame retardants to enhance the mechanical strength and flame retardancy, [ 33–42 ] and introducing sulfur, phosphorus atoms and benzene rings to improve refractive index. [ 43–46 ] Sulfur‐containing and phosphorus‐nitrogen‐containing polymers have been extensively developed due to the inherent excellent optical and flame‐retardant properties of phosphorus, sulfur and nitrogen.…”

An intrinsic flame‐retardant and heat‐resistant vinyl ester resin by crosslinking with diisocyanate, styrene and phosphorus‐containing hydroxyl compound

“…8,9 Halogen flame retardants are effective in enhancing the flame retardancy of polymer materials, but they will degrade to lots of release toxic and acidic smoke, including hydrogen halide, during combustion, leading to significant ecological damage and health hazard. [10][11][12] Halogen-free flame retardants feature numerous benefits, such as reduced smoke/toxicity, as well as exceptional flame retardation. As a result, they have gained tremendous attendance in both academia and industry.…”