Influence of shape and surface modification of nanoparticle on the rheological and dynamic-mechanical properties of polyamide 6 nanocomposites

Nanocomposites of polyamide 6 (PA6) with different concentrations of silane‐treated, organic‐treated, and nontreated nanoparticles of halloysite (HNT) and montmorillonite (MMT) had their microstructure and melt and solid state rheological behavior analyzed. The microstructure analysis was done using...

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Bibliographic Details
Published in:Polymer engineering and science 2013-07, Vol.53 (7), p.1512-1528
Main Authors: Marini, Juliano, Bretas, Rosario Elida Suman
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Dynamic testing
Exact sciences and technology
Forms of application and semi-finished materials
Materials
Mechanical properties
Microstructure
Nanocomposites
Nanoparticles
Nanostructure
Polyamide resins
Polyamides
Polymer industry, paints, wood
Polymers
Rheological properties
Rheology
Shear
Solid state
Technology of polymers
Testing
Transmission electron microscopy
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Summary:Nanocomposites of polyamide 6 (PA6) with different concentrations of silane‐treated, organic‐treated, and nontreated nanoparticles of halloysite (HNT) and montmorillonite (MMT) had their microstructure and melt and solid state rheological behavior analyzed. The microstructure analysis was done using transmission electron microscopy (TEM) and wide angle X‐ray diffraction (WAXD); the effectiveness of the silanization was studied by thermogravimetric analysis (TGA) and Fourier transform infrared. It was found that exfoliation occurred in the organic‐treated MMT, but not in the silane‐treated MMT and that silanization was small in the HNT nanoparticles (due to its low amount of surface hydroxyls groups). Steady state shear, small amplitude oscillatory, and transient tests also indicated that: (i) only the nanocomposites with organic‐treated MMT, at concentrations above the theoretical percolation threshold developed a percolated network; (ii) the silane treatment increased the shear elastic modulus (G) of the PA6/HNT nanocomposites in the solid state, but not of the PA6/MMT; (iii) the organic‐treated MMT formed composites with the highest G, as expected. Thus, it was concluded that the HNT nanoparticles had a high potential as nanofiller for PA6, but further research on more efficient compatibilizers for HNT is still needed. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.23405