Mechanical and thermal behavior of polyamide-6/clay nanocomposite using continuum-based micromechanical modeling

Abstract

The mechanical and thermal behaviors of polyamide-6/clay nanocomposites were studied using the continuum-based, micromechanical models such as Mori-Tanaka, Halpin-Tsai and shear lag. Mechanic-based model prediction provides a better understanding regarding the dependence of the nanocomposites' reinforcement efficiency on conventional filler structural parameters such as filler aspect ratio (α), filler orientation (S), filler weight fraction (ψ f ), and filler/matrix stiffness ratio (E f /E m ). For an intercalated and exfoliated nanocomposite, an effective, filler-based, micromechanical model that includes effective filler structural parameters, the number of platelets per stack (n) and the silicate inter-layer spacing (d 0 0 1 ), is proposed to describe the mesoscopic intercalated filler and the nanoscopic exfoliated filler. The proposed model nicely captures the experimental modulus behaviors for both intercalated and exfoliated nanocomposites. In addition, the model prediction of the heat distortion temperature is examined for nanocomposites with different filler aspect ratio. The predicted heat distortion temperature appears to be reasonable compared to the heat distortion temperature obtained by experimental tests. Based on both the experimental results and model prediction, the reinforcement efficiency and heat resistance of the polyamide-6/clay nanocomposites definitely depend on both conventional (α, S, ψ f , E f /E m ) and effective (n, d 0 0 1 ) filler structural parameters.

Elastic and yield behaviors of recycled polypropylene-based composites: Experimental and modeling study

“…Therefore, the three reference temperatures of neat PP and PPbased composites increased slightly (Equation (18)). The change of glass transition temperature between the DMA and compressive test (CT) would affect the WLF parameters which can be expressed as follows [15]: (11). In the RTW model, the ARs of EOC inclusions for PP/EOC (0P and 6P) and of talc particles for PP/Talc (0P and 6P) were kept at the same values as those used for the storage modulus predictions (Table 5).…”

“…Once these three moduli are determined, using Equation (11) and the results for the instantaneous moduli (E i ) will be substituted into Equation (7) to compute the effective composite moduli. Finally, the storage modulus of the non-recycled and recycled PP/EOC and PP/Talc composites could be predicted by this modified statistical model (Equation (7)).…”

Nonisothermal crystallization behavior of PP/rubber/clay nanocomposite

“…[8][9][10][11] The presence of nanoparticles influences the crystallization 12 and also affect mechanical properties of the partial crystalline polymer. 13,14 There are many kinds of silicates; hectorite, saponite, montmorillonite etc. The layer thickness is around 1 nm, and lateral dimension of these layers may vary from 30 nm to several microns depending on the particular silicate layers.…”

Preparation and characterization of polyimide/modified layered double hydroxide nanocomposites

“…Compared to TMH, the presence of the two five‐membered rings along with the one phenyl group in PMH provides appropriate hydrophobicity and compatibility with PI, which in turn favors extensive intercalation. The compatibility and optimum interactions between the polymer matrix, the organic modifiers and the LDH nanolayer surface itself are crucial to the formation of intercalated and especially exfoliated PI/LDH nanocomposites, such as PI/organoclay nanocomposites 23–25…”