Fig. 5

Stress relaxation and creep at 30, 35, 40 °C and 45 °C; The cycle of 2% elongation for 60 min and recovery for 60 min was repeated 13 cycles; (a) 30 °C; (b) 35 °C; (c) 40 °C; (d) 45 °C.

Stress relaxation and creep at 30, 35, 40 °C and 45 °C; The cycle of 2% elongation for 60 min and recovery for 60 min was repeated 13 cycles; (a) 30 °C; (b) 35 °C; (c) 40 °C; (d) 45 °C.