Tensile properties of melt intercalated polyamide 6 – Montmorillonite nanocomposites

Abstract

The effects of montmorillonite (MMT) addition level on the tensile properties of PA6-MMT polymer-layered silicate nanocomposites (PLSN) were quantified using factorial experimental design (FED) to fit experimental data to a series of polynomial response equations.Tensile behaviour, determined via FED, was related to the morphologies of the PLSN and compared to additional experimental data, determined for both a PLSN produced as a confirmation experiment and a PA6-MMT microcomposite of equivalent MMT content. In general, the PLSN displayed mechanical behaviour in keeping with their mixed exfoliated lamellae/intercalated lamellae-stack composite morphology and with the formation of a continuous phase of constrained polymer at a MMT loading of approximately 4 wt.-%. The data generated by the FED response equation for tensile modulus were compared to the predictions of the Halpin-Tsai composite theory model. A modification to the Halpin-Tsai model was made in order to take account of changes in the distribution of the number (n) of lamellae in the stack particles. Using experimental data for n, the composite moduli of the PLSN were successfully modelled as summations of the contributions of each particle fraction of varying n.

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

“…The embrittlement is all the higher as the clay content increases, acting as crack initiators. Finally, the tensile performances obtained with NaMMT are comparable with the ones reported in the literature [4]. Wilkinson et al [4] report that tensile modulus and yield stress are improved by 73% and 28% respectively when 5 wt% OMMT is incorporated in a PA6 matrix.…”

“…Finally, the tensile performances obtained with NaMMT are comparable with the ones reported in the literature [4]. Wilkinson et al [4] report that tensile modulus and yield stress are improved by 73% and 28% respectively when 5 wt% OMMT is incorporated in a PA6 matrix. For PEBA + 6.4wt% NaMMT prepared with water injection, these improvements reach 89 and 30% respectively.…”

“…Henceforth, different kind of polyamides (PA) or polyamide copolymers have been identified as suitable matrices for the elaboration of polymer/clay nanocomposites [2][3][4][5], bearing favorable polar amide functions along the backbone. Most of the studies dealing with PA/clay nanocomposites recourse to organically modified clay to successfully disperse the nanoplatelets.…”

Structure and Performance of Polyamide 6/Halloysite Nanotubes Nanocomposites

“…The PA6 nanocomposites with inclusions of organic montmorillonite (O-MMT), [4][5][6] carbon nanotubes (CNTs) [7][8][9] and attapulgite 10,11 have been intensively investigated.…”

Nanocomposites for Vehicle Structural Applications

“…Subsequently, knowing the macro values of stress and strain tensor it is possible to compute approximated values at the micro level, in each phase. Micromechanical models have been applied in several studies to predict elastic properties of nanocomposites (Luo & Daniel, 2003;Wu et al 2004;Wilkinson et al, 2007;Chavarria & Paul, 2004) as well as damage and failure Chen et al, 2003;Chen et al, 2007;Boutaleb et al, 2009). Luo et al (Luo & Daniel, 2003) studied properties enhancement of epoxy matrix reinforced with silicate clay particles.…”