Cyanate Ester/Functionalized Silica Nanocomposite: Synthesis, Characterization and Properties

Abstract

In this paper silica nanoparticles with covalently grafted polymer chains were incorporated into bisphenol A dicyanate ester (BADCy) to prepare composites which resulted in improvements in the mechanical and thermal properties. Fourier‐transform infrared (FT‐IR) spectroscopy transmission electron microscopy (TEM) and thermogravimetric analysis (TGA) were employed to examine the surface functionalization of silica nanoparticles. The effects of functionalized SiO2 (F‐SiO2) on the curing reactivity mechanical and thermal properties of BADCy resin were investigated systematically. The curing reaction of the system was facilitated with the addition of F‐SiO2. Meanwhile compared with the neat resin the incorporation of appropriate content of modified F‐SiO2 can enhance the mechanical properties including impact flexural strengths and fracture toughness KIC of BADCy resin. In addition the thermal stability of BADCy/F‐SiO2 nanocomposites is also superior to that of pure BADCy resin.

Synthesis and characterization of highly oxidative resistant silicon–acetylene hybrid resin grafted with modified mesoporous silica

“…SEM pictures in Figure 6(a)–(c) show that MPS nanoparticles form severe agglomeration due to the reaction of abundant hydroxyl groups on the surface of them. After modification due to the decrease of hydrogen bonds, 35 the agglomerates state of MPS particles has improved. Besides, APTES, which adhered to the surface of MPS, produces new steric hindrance.…”

“…The sharp peaks are caused by crosslinking reactions between molecular chains, including Diels–Alder intermolecular cyclization resulted by two C≡C bonds and hydrosilylation reaction between Si–H and C≡C bonds. 35 Since MA hung in the end of the resin chain, the motion of molecular chain is more difficult than the other two, and so, the peak of PSA-g-MA appears at a higher temperature. In PSA/MPS, MPS, as a kind of foreign articles, prevents rapid motion of chains, and the resistance cannot match with MA nanoparticles being sticked to the end of PSA-g-MA.…”

Mechanical, thermal and ablative behavior of organo nanoclay added carbon fiber/cyanate ester resin composites and effect of heat flux on its ablative performance

“…In the o-MMT nanoclay, active hydrogen groups (amine) present on the surface of nanoclay is showing catalytic effect on the curing of the CE. 6 This effect can be evidenced from the data shown in Table 2, where Ti, Te, Tp values shifted to lower temperatures with increase in heat of polymerisation (DH) for type I composites as compared to that of neat CE resin. From increase in DH, it can also be inferred that, cross link density increased due to addition of nanoclay to cyanate ester resin matrix.…”

“…On the other hand, researchers have explored addition of various nano materials like nanosilica, carbon nanotube, nanoclay, polyhedral oligomer silsesquioxane, nanozirconium tungstate to neat cyanate ester resin for enhancing their thermomechanical performance. [6][7][8] Among all these fillers, organic treated nanoclay is more popular due to its low cost and compatibility with the organic resin systems. Improvements in strength and stiffness for the polymeric systems with the addition of a small amount of nanoclay particles was reported earlier.…”

Synchronously improved toughness and dielectric properties of cyanate ester resins via modification with biobased poly(N‐phenylmaleimide‐co‐limonene)

“…11 In order to effectively enhance the impact properties of the CE resin, thermoplastic resins, toughness thermosetting resins, elastomers and nano-composite materials are commonly employed as toughening agents. 10,18,[25][26][27] Liu et al 12 reported that the addition of Si O C hyperbranched polysiloxane to BADCy resin resulted in a significant enhancement in impact strength (105.3%). Meanwhile, their work demonstrated much lower curing temperature, which was miraculously decreased by 93.5 C. Szeluga et al 28 selected epoxy-terminated butadiene-acrylonitrile rubber (ETBN) and polysiloxane core-shell elastomer (PSCS) as toughening modifiers to improve the mechanical properties of CE resin.…”