The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

Abstract

The present study investigated the effect of the surface functional groups of nanosilica on the interfacial, crystallization, and thermal stability of polyamide 6/SiO 2 (PA6/SiO 2 ) nanocomposite, in which nanosilica was modifi ed in situ with both 3-triethoxysilylpropylamine and 3-methacryloxypropyltrimethoxy silane¬ (KH-550 and KH-570). The FTIR analysis results showed the chemical bonding action between the reacting amino groups of nanosilica and end carboxyl groups of polyamide 6 enhanced with increasing the ratio of KH-550 and KH-570. The XRD spectrum indicated that the crystal structure of PA6/SiO 2 nanocomposites tended to form α crystal type that was benefi cial to an improvement of mechanical properties, and which was in agreement with the results of mechanical strength measurements. It was also found that crystallization temperature and crystallization rate of PA6/SiO 2 nanocomposites were lower than that of neat polyamide 6.

Surface-dependent effect of functional silica fillers on photocuring kinetics of hydrogel materials

“…Degree of surface coverage with modifying groups was calculated on the basis of elemental analysis results and surface areas using Berendsen and de Golan equation …”

Mechanical properties, morphology and thermal conductivity of polyamide composites filled with graphene nanoplatelets, Al2O3and graphite

“…1,2 However, the application of neat PA6 or PA66, two kinds of nylon, has been limited to some special fields due to its relatively low thermal conductivity. Therefore, PA is mostly compounded with other polymers [3][4][5] or rigid particles [6][7][8][9][10][11][12][13] to overcome these limitations. Graphene is an atomically thick, two-dimensional (2D) sheet composed of sp 2 carbon atoms arranged in a honeycomb structure.…”

Experimental and Numerical Investigation of Flow and Alignment Behavior of Waste Tire-Derived Graphene Nanoplatelets in PA66 Matrix during Melt-Mixing and Injection

“…In the literature, numerous studies have been reported on the enhancement of mechanical properties of PA-based composites by compounding with micro/nano additives such as montmorillonite [ 5 ], SiO 2 [ 6 ], and carbon-based materials such as carbon black [ 7 ], multi-walled carbon nanotubes [ 8 ], and exfoliated graphite [ 9 ] as well as by blending with other polymers such as high-density polyethylene [ 10 ], and polyphenylene sulfide [ 11 ]. However, high anisotropy and aggregation of carbon nanotubes (CNTs), stacking problems of exfoliated graphite, and brittleness in the presence of carbon black do not meet the requirements in the compounding process.…”