Effects of macromolecular silane coupling agent on the mechanical properties of nano-SiO₂/cyanate ester nanocomposites

Abstract

In this paper, a novel kind of high-performance composite was developed by blending 2, 2′-Bis(4-cyanatophenyl)isopropylidene with nano-silica (nano-SiO2), in which the nano-SiO2 was modified by a tri-copolymer of styrene, vinyltrimethoxysilane and methacrylate. The transmission electron microscopic and scanning electron microscopic micrographs indicated that the modified nano-SiO2 particles were dispersed in the 2′-Bis(4-cyanatophenyl)isopropylidene matrix homogeneously. Compared with pure 2′-Bis(4-cyanatophenyl)isopropylidene resin, the impact and flexural strengths of the nanocomposite materials were improved markedly with up to 58% and 40% increasing magnitude, respectively, and the storage modulus showed a 58% increase in the glassy state. Meanwhile, the glass transition temperature of the resulting composite was 310℃, which was 30℃ higher than that of pure 2′-Bis(4-cyanatophenyl)isopropylidene resin. It was found that the modified nano-SiO2 that possessed good dispersion in the 2′-Bis(4-cyanatophenyl)isopropylidene matrix had a significant influence on the mechanical and thermal properties of the 2′-Bis(4-cyanatophenyl)isopropylidene resin. All the improvements of properties could be attributed to the effect resulting from the changes of both interface adhesion and dispersibility of filler in matrix.

Effect of Nanoparticle Functionalization on the Performance of Polycyanurate/Silica Nanocomposites

“…Although this type of interface is often reported for polycyanurate/silica nanocomposites, other types of surface chemistry may provide significant benefits. For instance, Yan et al 29 recently reported significant improvements in cyanate ester nanocomposite mechanical performance when nanosilicas were modified with resin-compatible terpolymers. Devaraju et al 30 reported the beneficial effects of epoxy group functionalization on the dielectric properties of silicareinforced cyanate ester nanocomposites, while Jothibasu et al 31 examined nanocomposites in which 3-aminopropylsilane was used as a coupling agent.…”

Toughening of POSS–MPS composites with low dielectric constant prepared with structure controllable micro/mesoporous nanoparticles

“…So aligned gra modication is needed to improve its dispersion properties. [20][21][22][23] In order to promote the dispersion of POSS particles and ensure the dielectric properties of the material, the mesoporous silica (MPS) 24,25 is used to prepare the modied material. Hui Pan et al prepared a series of silica nanoparticles surface-modied with MPS, which exhibited excellent dispersibility in various solvents or polymer matrix.…”

The effect of silica nanotubes on mechanical performance of polymethyl methacrylate nanocomposites: Comparison to spherical nano-silica

“…3 However, two of the greatest challenges in producing organic-inorganic nanocomposites are the better dispersion of inorganic nanofillers and the stronger interface interactions between inorganic nanofillers and polymer matrix. [3][4][5] Spherical nano-silica (SiO 2 ) as a kind of attractive traditional nanofiller is widely applied to reinforce polymer matrix. The unmodified SiO 2 can disperse well in polymer matrix at very low concentration when the hydrogen-bonding interaction between nano-silica and polymer exists.…”