Abstract
Poly (tetramethylene terephthalate) (4GT)-poly (tetramethylene oxide) (PTMO) block copolymer films were drawn at 25°C with draw ratios up to 7 times. These drawn films were shrunk at various temperatures from 25 to 188°C and were redrawn at 25°C, The change in fine structures of the deformed 4GT/PTMO block copolymer films were investigated by X-ray diffraction. The long period (Lp) of the shrunk films decreased with decreasing the draw ratio (λ). The value of Lp of redrawn films increased remarkably at the initial stage of redrawing. The change in Lp against λ indicated a Lp-λ hysteresis in the shrinkage/redrawing processes. The small angle X-ray scattering (SAXS) patterns of relaxed films showed four-point diagrams, and transformed gradually into twopoint ones with an increase in λ during redrawing. These changes in Lp, and SAXS patterns of deformed films suggest that the shrinkage and redrawing processes cause a two-step deformation: the first step is slips between adjacent microfibrils; the second step is the contraction of intermicrofibrillar tie-chains.
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