Abstract
The fine structure and properties of ultra-high molecular weight polyethylene (UHMW-PE) films prepared by simultaneous biaxial drawing of the dried gel at 135°C were studied as a function of draw ratio. Scanning electron microscopy showed that the drawn films comprise fibrils which are several tens of nanometres thick and endlessly long. The fibrils are not straight along their whole length but entangled with each other. This is the most important structural feature of biaxially drawn UHMW-PE film. The small angle X-ray scattering peak corresponding to the long spacing disappeared at a certain draw ratio ( λ = 10 × 10). The differential scanning calorimetry (d.s.c.) measurements indicated that extended chain type crystals increase with increasing draw ratio. The crystallinity estimated by density, d.s.c. and infrared absorption was much less than that of uniaxially drawn materials, although it slightly increased with increasing biaxial draw ratio.
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