Transcrystallinity in brominated UHMWPE fiber reinforced HDPE composites: morphology and dielectric properties

Distributed Physical and Molecular Separations for Selective Harvest of Higher Value Wheat Straw Components Project

“…For composites, high activation energies are associated with large degrees of interactions between polymer matrix and filler. In general, activation energies obtained for the α-transition in our SPC are comparable to literature values for various polyethylenes and polyethylene-based composites (Matsuo et al 2003, Vaisman et al 2003, Pegoretti et al 2000.…”

Distributed Physical and Molecular Separations for Selective Harvest of Higher Value Wheat Straw Components Project

“…For composites, high activation energies are associated with large degrees of interactions between polymer matrix and filler. In general, activation energies obtained for the a-transition in our SPC are comparable to literature values for various polyethylenes and polyethylene-based composites (Matsuo et al 2003, Vaisman et al 2003, Pegoretti et al 2000.…”

On the β Transition in High Density Polyethylene: the Effect of Transcrystallinity

“…As a result, a significant b transition was detected over a wide frequency range. [10] The results with the thermally treated HDPE, and particularly the results with the transcrystalline HDPE, suggest that it is the lamellae organization and spherulitic habit (not crystallinity itself) that causes the b transition to be prominent.…”

“…[10] The aligned fibers were placed between two PE films and pressed at 144 8C for 20 min at a pressure of 0.5 MPa. Two specimen types were prepared either by isothermal treatment (90 min at 124 8C), to grow a thick transcrystalline layer, or by ice-water quenching, to avoid it.…”

“…[8] The latter observation is even more pronounced for the b transition in transcrystalline PE, which is characterized by a dense, highly ordered lamellar structure (with no significant change of the degree of crystallinity). [9] We have discovered a significant transcrystalline-related b transition in UHMWPE fiber-reinforced HDPE (PE/PE composites) [8,10] and in crosslinked UHMWPE fiber compacts. [11] The b transition was identified initially by dynamic mechanical analysis of PE/PE composites, where thermally treating the material to enhance transcrystallization increased the magnitude of the b peak significantly.…”