| 摘要 |
Thermoplastic tape, ribbon or line material is prepd. as follows: (a) a melt-crystallised precursor polyethylene tape (I) of mol. wt. above 300,000 is immersed in a liq. bath at ca. 130 deg C until it has swelled into a pseudo-gel state; (b) the swollen tape is compressed lightly then treated with a solvent to remove all residual bath liq.; (c) the tape is heated to remove all residual solvent and provide a dried porous prod. with higher porosity than the original (I); (d) the prod. is compressed at 100,300,000 psi (depending on the thickness), and (e) the tape is stretched at 80-130 deg C to afford a drawn prod. with increased mechanical props. including a modulus 0.5-100 GPa, and tensile strength 0.1-2 GPa. |
