Fibrillated polymer compositions and methods of their manufacture

A polymer composition comprising:

• a matrix polymer component comprising polypropylene, nylon, linear low-density polyethylene, low-density polyethylene, high density polyethylene, or a combination thereof;
• and
• 0.1 wt. % to 15 wt. %, based on the weight of the polymer composition, of a fibrillated fluoropolymer, a fibrillated fluoropolymer encapsulated by an encapsulating polymer, or a combination thereof,
• wherein the composition has a complex viscosity, measured at a 0.1 rad/sec, of between 4500 Pa·s and 70,000 Pa·s, measured at a temperature of between 230° C. and 260° C., and
• wherein the composition has an extensional viscosity of between 11,000 and 90,000 Pa·s at a maximum Hencky strain of 2.0 at a strain rate of 1 s−1, measured at a temperature of between 230° C. and 260° C.