Effect of Clay Modification on the Mechanism of Local Deformations in PA6 Nanocomposites

Dominkovics, Zita; Naveau, Elodie; Jérôme, Christine; Hári, József; Renner, Karl; Móczó, János; Alexandre, Michaël; Pukánszky, Béla

doi:10.1002/mame.201200244

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…The increase of volume is initiated at relatively small stresses. The related process was identified earlier as cavitation [52]. Particle fracture and/or debonding starts at slightly larger stress as shown by the characteristic stress determined by the acoustic emission measurement.…”

Section: Discussion Correlationsmentioning

confidence: 86%

Competitive interactions, structure and properties in polymer/layered silicate nanocomposites

Hári¹,

Horváth²,

Móczó³

et al. 2017

Express Polym. Lett.

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Abstract. Thermoplastic polymer/layered silicate composites were prepared from the same organophilized montmorillonite (OMMT) and four different matrices, polypropylene (PP), the blend of PP and a maleated polymer (MAPP), poly(lactic acid) (PLA) and polyamide (PA) in order to study the effect of their chemical structure and interactions on composite structure and properties. The components were homogenized by extrusion and then specimens were injection molded, which were then characterized by a variety of methods. The results showed that competitive interactions among silicate layers and between the silicate and the polymer determine the extent of exfoliation, and structure. The morphology of the composites is complicated, exfoliation is never complete, besides individual silicate layers, the composite can contain a silicate network, stacks of silicate platelets and larger particles in various amounts. Several local deformation processes can take place around the structural entities as well as in the matrix. Fracture and debonding are the main particle related processes, while cavitation takes place in the polymer, at least in PA and PLA. The macroscopic properties of layered silicate composites are determined by the extent of exfoliation and interfacial adhesion that decreases upon organophilization. Increased reinforcement and improved composite properties can be achieved only by the proper control of all interactions prevailing in the composite.

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Section: Discussion Correlationsmentioning

confidence: 86%

Competitive interactions, structure and properties in polymer/layered silicate nanocomposites

Hári¹,

Horváth²,

Móczó³

et al. 2017

Express Polym. Lett.

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“…The phase interface behavior complicates the discussion of clay influence due to a lack of information. Furthermore deformation and failure are not as well investigated as structure and special properties [6]. The fitting clay surface modification is one of the most important challenges concerning the processing of the nanocomposite because it influences both the clay dispersion in the matrix and the phase interaction [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Mechanical Properties of Nano Particle Modified Polyamide 6 via RVE Modeling

Huang¹,

Uhrig²,

Weber³

et al. 2015

MSCE

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In this paper the mechanical behavior of a Polyamide 6 (PA 6)/Montmorillonit (MMT)-nanocomposite is examined by a selected structure modification within a numerical parameter study. Experimental data of tensile tests of three different volume fractions at ambient temperature are used as reference. These were compared to homogenized stress-strain curves calculated with 3D representative volume elements (RVE) under periodic boundary conditions. Thereby the curve areas are considered until the tensile yield strength is reached. Besides the influence of filler orientation, exfoliation and its volume fraction, especially the adhesive interface behavior between filler and matrix, and local, partially crystalline interphases around the MMT-plates were taken into account. The interface behavior was described using a cohesive zone model whereby the implemented values where derived from a Molecular Dynamics (MD) simulation. The local, partially crystalline interphases around the MMT plates were modeled with a thickness of 30 -40 nm. These areas were assumed to be transversely isotropic both in the elastic and in the plastic regime, whereby the transverse plane is defined by the lateral particle surface. A good approximation of the experimental curves was achieved only after the introduction of those interphases. In the elastic regime an excellent agreement is found between experimental and numerical values. In the plastic regime especially the largest MMT volume fraction investigated, matches perfectly with the experimental reference, whereby lower filler contents slightly underestimate the mechanical values.

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Micromechanics-based constitutive modeling of plastic yielding and damage mechanisms in polymer–clay nanocomposites: Application to polyamide-6 and polypropylene-based nanocomposites

Mesbah

Zaïri

Naït-Abdelaziz

et al. 2014

Composites Science and Technology

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Effect of Clay Modification on the Mechanism of Local Deformations in PA6 Nanocomposites

Cited by 4 publications

References 26 publications

Competitive interactions, structure and properties in polymer/layered silicate nanocomposites

Competitive interactions, structure and properties in polymer/layered silicate nanocomposites

Numerical Simulation of Mechanical Properties of Nano Particle Modified Polyamide 6 via RVE Modeling

Micromechanics-based constitutive modeling of plastic yielding and damage mechanisms in polymer–clay nanocomposites: Application to polyamide-6 and polypropylene-based nanocomposites

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