| abstract |
The present invention relates to stretching polymer films, it is made of the daiamid composition comprising semi-crystalline semi-aromatic polyamide (PPA), wherein the PPA derived from following repetitive unit by forming: aromatic dicarboxylic acid, it includes the terephthalic acid (TPA)s of at least 80 moles % of the total amount relative to the aromatic dicarboxylic acid；And diamines, it includes 1, the 6- hexamethylene diamines of the Putriscine of at least 5 moles % of the total amount relative to the diamines and at least 5 moles %, and wherein Putriscine and 1, the merging amount of 6- hexamethylene diamine are at least 60 moles of % relative to the total amount of diamines；With other monomeric units of 0-2 moles of %, wherein mole % is the total amount relative to aromatic dicarboxylic acid, diamines and other monomeric units.The invention further relates to the methods that PA membrane is prepared by melting extrusion and stretched film. |