Deformation resistance in oriented nylon 6

Abstract

Initially spherulitic nylon 6 was textured into a quasi-single crystal form by plane-strain compression at 170 "C in a deep channel-die to a compression ratio of 4.0, followed by cooling under pressure to room temperature. The resulting material, having orthotropic symmetry with quasi-single crystalline perfection, had a dual morphology in which the normals of the crystallographic (100) planes equipartition at f21° with respect to the constraint direction of the plane-strain deformation. This highly textured material, having relatively large dimensions in all directions, was wed to study the elastic and plastic anisotropy of the actual constituent lamellar crystallites. As a result, a complete set of nine elastic compliances of the orthotropic sample were measured by a simple direct technique and were related to the monoclinic crystal properties. In addition, detailed measurements were made of the plastic anisotropy of this textured material to establish that plastic response of the actual monoclinic nylon 6 crystallites is derived principally from three crystallographic slip processes consisting of the (001) [OlO] and (100)[0103 chain slip systems and the (001)-[ 1001 transverse slip system. The plastic shear resistances of all these slip systems were found to increase substantially with increasing compressive stress acting across the slip planes. Among these three deformation mechanisms, (001)[0101 chain slip is the easiest system to be activated.

Dispersion of nano-silica in monomer casting nylon6 and its effect on the structure and properties of composites

“…Clearly, this also manifests the feasibility of the strategy we proposed in the Introduction part to prepare silica/MC nylon6 in-situ nanocomposites with uniformly distributed nanoparticles. Nylon6 is well known to crystallize into variously phase: the α stable crystal and among others the γ one [18]. WAXD was used to gain insight into the influence of nano-silica on the crystal form of MC nylon6.…”

Plasticity of semi-crystalline polymers: crystal slip versus melting-recrystallization

“…Argon and coworkers have also studied isotropic and single-crystal-textured samples of various semi-crystalline polymers such as polyamide 6 [31,32] and poly(ethyleneterephthalate) [33]. As in the case of PE, these authors have reported detailed analyzes of the plastic processes in terms of crystallographic slip, together with useful data of critical shear stresses and pressure sensitivity factors [31].…”

“…As in the case of PE, these authors have reported detailed analyzes of the plastic processes in terms of crystallographic slip, together with useful data of critical shear stresses and pressure sensitivity factors [31].…”

Morphology of Highly Textured E/EP Diblock Copolymers

“…A channel die, the description of which is given in detail elsewhere [17,18,19,20], was used to subject the polymers to plane strain compression up to compression ratios of 12. Figure 1 shows a sketch of the channel die and defines the three principal directions, i.e., the lateral constraint direction (CD), the free (or flow) direction (FD), and the loading direction (LD).…”