Preparation and properties of nylon 6/carboxylic silica nanocomposites via in situ polymerization

Nylon 6/carboxylic acid‐functionalized silica nanoparticles (SiO2‐COOH) nanocomposites were prepared by in situ polymerization of caprolactam in the presence of SiO2‐COOH. The aim of this work was to study the effect of carboxylic silica on the properties of the nylon 6 through the interfacial inter...

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Bibliographic Details
Published in:Journal of applied polymer science 2011-10, Vol.122 (2), p.1316-1324
Main Authors: Zhang, Lala, Xiong, Yuzi, Ou, Encai, Chen, Zhongming, Xiong, Yuanqin, Xu, Weijian
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Dispersions
Exact sciences and technology
Forms of application and semi-finished materials
in situ polymerization
Materials science
Mechanical properties
Nanocomposites
Nanoparticles
Nylon 6
Polymer industry, paints, wood
Polymerization
Polymers
Silicon dioxide
SiO2-COOH
Technology of polymers
Weight loss
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Summary:Nylon 6/carboxylic acid‐functionalized silica nanoparticles (SiO2‐COOH) nanocomposites were prepared by in situ polymerization of caprolactam in the presence of SiO2‐COOH. The aim of this work was to study the effect of carboxylic silica on the properties of the nylon 6 through the interfacial interactions between the SiO2‐COOH nanoparticles and the nylon 6 matrix. For comparison, pure nylon 6, nylon 6/SiO2 (unmodified) and nylon 6/amino‐functionalized SiO2 (SiO2‐NH2) were also prepared via the same method. Fourier transform infrared spectrometer (FTIR) spectroscopy was used to evaluate the structure of SiO2‐COOH and nylon 6/SiO2‐COOH. The results from thermal gravimetric analysis (TGA) indicated that decomposition temperatures of nylon 6/SiO2‐COOH nanocomposites at the 5 wt % of the total weight loss were higher than the pure nylon 6. Differential scanning calorimeter (DSC) studies showed that the melting point (Tm) and degree of crystallinity (Xc) of nylon 6/SiO2‐COOH were lower than the pure nylon 6. Mechanical properties results of the nanocomposites showed that nylon 6 with incorporation of SiO2‐COOH had better mechanical properties than that of pure nylon 6, nylon 6/SiO2, and nylon 6/SiO2‐NH2. The morphology of SiO2, SiO2‐NH2, and SiO2‐COOH nanoparticles in nylon 6 matrix was observed using SEM measurements. The results revealed that the dispersion of SiO2‐COOH nanoparticles in nylon 6 matrix was better than SiO2 and SiO2‐NH2 nanoparticles. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.33967