Fig. 4

The maximum strain-induced P2z a and degree of crystallinity Ψ b achieved after annealed stress relaxation as a function of fiber-drawing temperature and strain rate. The optimal strain rates to achieve maximum P2z and degree of crystallinity at 400, 500, and 600 K are 5 × 106, 2 × 108, and 5 × 108 s−1, respectively.