Estimation of Mechanical Performance, Thermal Stability and Flame Retardancy of High-Impact Polystyrene/Surface-Modified APP/Carboxylic-Functionalized MWCNTs Nanocomposites

Abstract

An ammonium polyphosphate (APP) surface-modified by silane coupling agent was used as flame retardant in high-impact polystyrene (HIPS). A series of HIPS nanocomposites containing different mass fractions of APP (k-APP) surface-modified by silane coupling agent (3-aminopropyl triethoxysilane, KH 550) and carboxylic-functionalized MWCNTs (COOH–MWCNTs) were prepared by the melt blending method. A composite only containing APP was also prepared as a reference material. Scanning electron microscopy (SEM) was employed to investigate the dispersion of the fillers into the HIPS matrix, and it was found the hydrophobic groups on the k-APP surface would greatly enhance the dispersion and prevent agglomerations compared with APP. Furthermore, the COOH–MWCNTs also showed good dispersibility into the matrix. Mechanical tests of the nanocomposites revealed that k-APP exhibits a more beneficial effect on both tensile and flexural properties compared with APP. Thermogravimetric analysis (TGA) and cone calorimeter tests (CCT) were conducted to probe the thermal and flammability properties of the nanocomposites, respectively. The synergistic effects of k-APP and COOH–MWCNTs on mechanical, thermal and flammability properties were examined as well.

Synergistic Fire Retardancy of Bis(1‐methoxy‐2,2,6,6‐tetramethylpiperidin‐4‐yl)sebacate and Tris(2,4,6‐tribromophenoxy)‐1,3,5‐triazine/Sb2O3 in HIPS

“…However, HIPS are flammable, thus underlining the importance of flame retardant treatments. e fire retardants used in HIPS are mainly phosphorus fire retardants, including red phosphorus [1][2][3][4], ammonium polyphosphate [5,6], and organophosphorous compounds [6][7][8][9]; brominated flame retardant, metal hydroxide [1-3, 9, 10]; and inorganic nanoparticles, such as multiwalled carbon nanotube [6,11], graphene and molybdenum disulfide [12], silica nanoparticle [7], and montmorillonite [8,12,13].…”

Reactive and Additive Modifications of Styrenic Polymers with Phosphorus-Containing Compounds and Their Effects on Fire Retardance

“…Meanwhile, the solution mixing begins with the dispersion of the additives in a polymeric solution followed by a controlled solvent evaporation and a composite film casting [ 52 ]. The organic and inorganic compounds, multi-component formulations, and a range of nanomaterials are used as the additive FRs for different sub-classes of styrenic polymers [ 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 ...…”

“…Ammonium polyphosphate is a hydrophilic inorganic material; hence, the dispersion of any hydrophobic FR with APP would affect the preparation, uniformity, and properties of the obtained composites. To overcome this difficulty, Ding et al (2019) proposed the surface modification of APP that would improve its dispersion and compatibility with hydrophobic carboxylic-functionalised multi-walled carbon nanotubes (COOH-MWCNTs) [ 64 ]. The surface of APP was treated with a silane-coupling agent, 3-aminopropyl triethoxysilane (KH 550), to obtain the modified APP (k-APP).…”

Efeito da adição de resíduo do endocarpo de tucumã (Astrocaryum Aculeatum) em Poliestireno de Alto Impacto (PSAI)

“…O poliestireno de alto impacto (PSAI) possui em sua composição, cerca de 14 % de polibutadieno o que garante uma significativa tenacidade, ductilidade e resistência ao impacto comparado ao poliestireno cristal [11,12]. Tem aplicação em displays de produtos em geral, placas de sinalização internas, brindes e embalagens de produtos [12,13].…”