trans-1,4-Polybutadiene (t-1,4-PB) is added to UHMW-PE, prior to dissolution and ultra-drawing, to enhance the crosslinking efficiency of drawn tapes upon electron-beam irradiation.
The addition of t-1,4-PB indeed enhances the crosslinking efficiency of drawn, oriented UHMW-PE tapes.
Further, the efficiency of draw evaluated from the crystalline chain orientation was higher for γ-crystals than α-crystals.
On the other hand, for films with γ-crystals, the effect of intercrystalline network on the efficiency of draw was less prominent.
The improved efficiency of draw with higher molecular weight was explained by the suppression of disentanglement and relaxation of oriented amorphous molecules during deformation; both are important in the development of structural anisotropy and continuity along the draw direction.
At a forging temperature below the smectic-phase stability limit temperature (Ts), the efficiency of draw, parallel to the uniplanar direction, was high (∼97%) and independent of the compression ratio, pressure and draw temperature (Td).
The improved ductility and efficiency of draw developed as a result of changes in supermolecular structure and in the number of net points due to entanglements and stress-induced crystals during deformation.
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The efficiency of the drawing, based on the Herman crystalline orientation function (fc) and tensile properties versus DR, was lower for films drawn at higher temperatures.
The effects of draw conditions on the deformability and efficiency of uniaxial draw were studied for solution-spun fibres from high molecular weight poly ethylene terephthalate) (intrinsic viscosity = 2.6 dl g−1).
