In order to study the dyeing property of Spandex, diffusion of p-nitroaniline (PNA) and p-aminoazobenzene (PAAB) and stress relazation of the samples (F-70 and T-280) were studied both at
T=40-90°C in the dry state and following results were obtained.
(1) Diffusion coefficient
D vs. 1/
T is expressed by two lines intersecting at
Td=64-66°C, Apparent activation energy of diffusion (
ΔEd) is estimated to be about 18-20kcal/mol and 40kcal/mol for
T>
Td and
T<
Td, respectively.
ΔEd is slightly larger for PAAB than for PNA.
(2) Reduced relaxation modulus vs. log
t superposable to yield a master curve. Logarithm of shift factor
aT vs. l/
T is also linear and having a break at
Tr, which is in good accordance with
Td. Activation energy of relaxation (
ΔEr) is close to the value of corresponding
ΔEd.
(3) Log
D vs. log
aT is linear and breaks at the corresponding temperature with
Td or
Tr. The slope of the line fluctuates slightly in the vicinity of unity as required by the theory.
(4) Both
D vs.
T and
aT vs. T obey to the WLF formula, where the observed parameters
c_??_ and
c_??_ are close to the theoretical values for
T>Td(Tr) but larger for
T<Td(Tr).
(5) The above mentioned behaviors of F-70 are very similar to those of T-280, although the former is of ester type while the latter is of ether type.
It is concluded that the soft segment behaves as similarly as amorphous polymers above
Tg especially at temperature higher than
Td or
Tr.
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