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The instantaneous elastic moduli for a nylon-6 monofilament were derived on strain recoveries right after creep, stress relaxation, and rapid elongation,E c,E s andE e, respectively. It was found that during strain recoveryE s(>E e) andE e increase monotonically with increasing load,m 1, on the sample. The extrapolated value of Es atm 1=0 g is almost equal to Young's modulus, 4.06 GPa. The value ofE c also increased with increasingm 1, and atm 1=600 g (1.93 t cm−2) reached about 14 GPa. The endothermic heat change right after creep, stress relaxation or rapid elongation,Q, was negligibly small. For comparison,E s,E c andQ were also investigated for silicone rubber. It was found thatE s (53.8 M Pa at the draw ratioD=1.2) decreased abruptly atD=1.3. In the range ofD=1.4–1.9,E s was only 22.6 MPa. In the case of stress relaxation,Q increased with increasingD from 4 J mol−1 (atD=1.2) to 56 J mol−1 (atD=1.9). FurthermoreE c (5.58 MPa atm 1=133.8 g (429.4 kg cm−2)) increased gradually with increasing m1 and attained 16.6 MPa atm 1=548.4 g (1.76 t cm−2). In the case of creep,Q was in the range of 0–11.5 J mol−1 and larger when larger loads,m 2 were removed during the later stages of creep.

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