Abstract
This paper studies the flexural and the impact properties of polyamide 6-based knitted reinforced single polymer composites (KSPCs) prepared by compression molding of powder-coated textile structures. To prepare matrix component, polyamide 6 microparticles (MPs) were synthesized by activated anionic ring-opening polymerization of ε-caprolactam in solution and then used for powder-coating of the knitted structures. The influence of the reinforcements' architecture, plies orientation, stacking order and fiber content on the final mechanical properties of KSPCs were investigated. Rib1 × 1 and Jersey knitted structures were selected as reinforcements and treated by a stretching-annealing procedure to modify their mechanical properties. The anisotropic tensile and compression properties imparted by the knitted structures were found to be the major factors determining the impact and flexural behavior of KSPCs. Moreover, reinforcement's crossover points, the plies orientation and the presence of a transcrystalline layer at the matrix-reinforcement interface were identified as relevant parameters. The fracture mechanism of KSPCs was linked to the morphology and crystalline structure of the resulting composites and investigated by simulation and finite element analysis of knitted reinforcements.
Highlights
Nowadays there exists an increasing demand for lightweight and cost-effective thermoplastic materials that are easy to recycle by reprocessing without significant loss of useful properties
Polyamide 6 based single polymer composites reinforced by knitted structures (KSPCs) were produced by combination of powder-coating and compression molding techniques (PCCM)
The necessary polyamide 6 (PA6) microparticles from which the composite matrix ordinated were preliminarily synthesized by solution-precipitation activated anionic ring opening polymerization (AAROP)
Summary
Nowadays there exists an increasing demand for lightweight and cost-effective thermoplastic materials that are easy to recycle by reprocessing without significant loss of useful properties. Khondker et al [19] dealt with the effect of Rib1 × 1 and Jersey architecture on the low-velocity drop weight impact of glass/ vinyl-ester composites Their results showed that apparent mesh size of the knit structures decreased by the higher value of total loop density which provided better through-thickness-strength of the knit composite materials. The method for KSPC preparation described in this study provides conditions for a wider processing window avoiding the melting of the Rib1 × 1 or Jersey textile reinforcements This is decisive for the good mechanical performance of the new PA6-based KSPCs. The relation between the geometrical, tensile and compression properties of the knitted reinforcements and the flexural and impact properties of the final KSPCs was studied. These simulations illustrated stress distributions in both knitted reinforcements while tensile displacements were applied in different directions
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