Abstract
Films of ultra-high molecular weight isotactic polypropylene (4.4×106) were produced by gelation/crystallization from dilute solutions according to the method of Smith and Lemstra. The dried gel films could be readily stretched to a maximum draw ratio of 100 in a hot oven at 165—17 °C. For a draw ratio of 100, tensile strength and the Young’s modulus attained the maximum values of 1.56 and 40.4 GPa, respectively, at 20°C. These values are among the highest reported for polypropylene. The tensile strength was beyond the theoretical value reported by Samuels and the Young’s modulus is close to the theoretical value measured by X-ray diffraction.
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