The maximum achievable draw ratio (DR) for s-PP was 5 10, depending on the initial morphologies, and significantly lower than that for i-PP (DR ≤ 30).
The effects of the draw ratio (DR), draw temperature (Td), and draw stress on the crystal/crystal transformation from the α- to the β-form crystals were studied.
The results also revealed that the deformation behavior of the crystal structure was dependent on the draw ratio (DR).
In the early stage of drawing at low draw ratio (DR), multiple neck was observed in the filament containing undrawn and drawn segments of the filament.
The complexed films could be drawn at room temperature to draw ratios (DR) up to ∼30, and could then be decomplexed, or regenerated, by soaking in water.
The present study revealed that the water vapor transmission rate (WVTR) as a function of draw ratio (DR) went through a maxima.
An increase in fibre draw ratio (DR) for heat set samples produced an increase in tenacity, birefringence and X-ray intensity.
The stretched/oriented films were compared for their water vapor transport and optical properties as a function of the extent of orientation (i.e., draw ratio, DR).
The results are as follows: (1) When an unoriented amorphous PEN film was stretched below Tg (= 117 °C), it could be elongated up to a draw ratio (DR) of 4 5 via neck formation and became an oriented amorphous film.
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The UHMW-PE prepared even at a high polymerization rate of 43,600 (g of PE /(mmol of transition metal,h) could be drawn to draw ratios (DR) over 50, producing tapes with tensile modulus and strength over 100 and 1.0 GPa, respectively.
