Abstract
Abstract The present study investigated the effect of the surface functional groups of nanosilica on the interfacial, crystallization, and thermal stability of polyamide 6/SiO2 (PA6/SiO2) nanocomposite, in which nanosilica was modified 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/SiO2 nanocomposites tended to form α crystal type that was beneficial 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/SiO2 nanocomposites were lower than that of neat polyamide 6.
Highlights
Nanosilica used as a filler has been applied in rubber, polyamide, polyolefin, and unsaturated polyester resin, etc
Among other nanosilica including RA1, RA2, RA3, RA4, and RA5, the same process procedures were used for preparing polyamide 6 and PA6/SiO2 nanocomposites, the samples were noted as PA6, PRA1, PRA2, PRA3, PRA4, and PRA5, respectively, and the extracted nanosilica were denoted as ERA1, ERA2, ERA3, ERA4, and ERA5
The chemical grafting of polymer chains which are compatible to the polymer matrix on the inorganic particles improve the interfacial strength, and that leads to strong mechanical properties
Summary
Nanosilica used as a filler has been applied in rubber, polyamide, polyolefin, and unsaturated polyester resin, etc. The incorporation of surface-modified nanosilica inside polyamide 6 has proved to be an effective way of improving the mechanical properties and the dispersion of nanosilica. Li4, Zhao[5], and Fang[6] all have prepared PA6/ SiO2 nanocomposite via in situ polymerization method by addition of functionalized nanosilica, which has been confirmed as a more excellent method compared with a melt blending method for an improvement of the properties of polyamide 6. Surface modified in situ nanosilica with two or more functional groups as the filler is seldom to apply in the polymer matrix.
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