Morphology and mechanical properties of poly(ethyleneoctene) copolymers obtained by dynamic packing injection molding

Abstract

The morphology and mechanical properties of poly(ethylene-octene) copolymers (POE) obtained by dynamic packing injection molding were investigated by mechanical tests, differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The mechanical tests found that only POE with low octene content and high molecular weight show apparent response for external shear field. Further investigation has been done by DSC, FT-IR, and SEM in order to make clear the reason of that phenomenon. Finally, the hypothetical mechanism of POE microstructure formation under shear field has been proposed. For POE with low octene content and high molecular weight, orientation degree and mechanical properties both increase substantially under shear field. For POE with low octene content and low molecular weight, orientation degree and crystallinity increase under shear field, but it is not dramatically benefit for the mechanical properties. For POE with high octene content and high molecular weight, the shear field has little effect on the morphology and mechanical properties.

Towards Tunable Sensitivity of Electrical Property to Strain for Conductive Polymer Composites Based on Thermoplastic Elastomer

“…Shear can often result in orientation in polymer matrix. − 2D-WAXD was also conducted to examine the structure of polymer matrix under strain for different composites. In the wide-angle region (Figure b), scattering peaks from the amorphous polymer (2θ = 17.6°, inter-planar spacing of 0.446 nm) and crystalline TPU soft-segments (2θ = 19.0°, inter-planar spacing of 0.413 nm) are visible.…”

Effects of Dynamic Crosslinking on Crystallization, Structure and Mechanical Property of Ethylene-Octene Elastomer/EPDM Blends

“…The amorphous portion of the random ethylene-octene segment contributes to the elasticity [ 6 , 9 ]. Its flexibility and mechanical properties, like synthetic rubber, combined with the melt processability, make the ethylene-octene elastomer a very good material with many industrial applications [ 10 , 11 , 12 , 13 , 14 ]. However, its large permanent deformation and other disadvantages limit its application.…”

Mechanical and Thermal Properties of Styrene-diene Block Copolymers Films Obtained by Spin Casting from Different Solvents

“…These structures are also influenced by the processing conditions, as for a styrene-butadiene block copolymer with 32% polystyrene obtained by spin casting from toluene, a lamellar structure is obtained, while a hexagonal cylindrical structure is achieved by extrusion due to the annealing during the process [4]. It has been established that there is a close correlation between these morphologies and the physical-mechanical properties corresponding to SDS block copolymers [5][6][7][8][9][10].…”