Effects of silane-modified multiwalled carbon nanotubes and 9,10-dihydro-9-oxa-10 phosphaphenanthrene-10-oxide on the flame retardancy and mechanical properties of bismaleimide resin

Abstract

In this article, the multiwalled carbon nanotubes modified by γ-aminopropyltriethoxysilane (MWCNT-APTES) and 9,10-dihydro-9-oxa-10 phosphaphenanthrene-10-oxide (DOPO) were added into the 4,4′-bismaleimidophenyl methane (BDM)/2,2′-diallyl bisphenol A (DBA) resins to prepare the flame retardant resins. Morphological observations reveal that the MWCNT-APTES is homogeneously dispersed in the matrix. The impact strength of the resin is improved by adding MWCNT-APTES. Meanwhile, BDM/DBA containing DOPO/MWCNT-APTES achieves vertical burning (UL-94) V-0 rating and a higher limiting oxygen index. Thermogravimetric analysis and scanning electron microscopy measurements have demonstrated that MWCNT-APTES resulted in the increase in char yield and the formation of the thermally stable carbonaceous char. The results of Raman show that the MWCNT-APTES can enhance the graphitization degree of the resin during combustion. All the investigations show that the combination of DOPO and MWCNT-APTES is an effective additive to develop high-performance resins with attractive flame retardance and mechanical properties.

The effects of processing and carbon nanotube type on the impact strength of aerospace‐grade bismaleimide based nanocomposites

“…[37] All the exterior skins of the F-22 are made using BMI as well. [37] Nanocomposites of BMI with graphene, [38][39][40][41][42][43][44][45][46] and CNTs [47][48][49][50][51][52][53] have been studied in prior works. CNTs have been functionalized with hyperbranched polyethyleneimine, [47] amines, [48] nitric acid, [50] ethylene di amine, [50] and diaminodiphenylmethane [50] to prepare nanocomposites with a two-component BMI system containing 4,4 0bismaleimidodiphenylmethane and diallylbisphenol A.…”

High-performance polymer composites with enhanced mechanical and thermal properties from cyanate ester/benzoxazine resin and short Kevlar/glass hybrid fibers

“…For instance, the as-received SKFs (Figure 4(a)) showed the presence of N–H stretching groups at 3350 cm −1 , 30 C=O stretching vibrations at 1650 cm −1 , in plane aryl C–H vibrations at 1018 cm −1 , 31 and the out of plane C–H stretching groups at 825 cm −1 , 32 while the pure SGFs (Figure 4(b)) practically revealed the existence of no specific functional groups on their external surfaces, 33 mainly indicating low physical and chemical interactions with the polymer matrix. Nevertheless, the IR spectrum of both treated short fibers presented some supplementary bands in the investigated range, such as the CH 2 and CH 3 stretching bands centered nearly at 2940 and 2840 cm −1 , 28 the Si–O–Si groups located approximately at 1245 cm −1 , 34 and the Si–C vibrations situated at around 845 cm −1 . 16 In addition to the above-detected bands, the typical vibration associated with epoxy groups was clearly observed for both treated fibers in the region of 906 cm −1 .…”

Mechanical properties of aluminum bonded joints reinforced with functionalized boron nitride and boron carbide nanoparticles

“…The use of coupling agent (like silane compound) is so important in the production of nanoparticle reinforced epoxy to increase the interaction between epoxy and nanoparticle. [27][28][29] Apart from the aforementioned BNNTs and micro BN in size, there is no study on hexagonal boron nitride (h-BN), especially boron carbide (h-B 4 C) nanoparticles reinforced adhesively bonded joints in the literature.…”