抄録
Visco-elastic property of P. V. A. film which container congo red (both of mixed and sorbed states) was measured by means of Vibrating Reed Method. Temperature dependencies of the mechanical loss tangent (tan δ) and real part of complex dynamic modulus (E1) are shown graphically.
The crystalization of P. V. A. film or fibre in which congo red is sorbed usually did not occur during the heat-treatment. But in our experiment the mechanical properties of P. V. A. film, which contained congo red, changed during the heat-treatment. From this result and our previous reports, it is concluded that the association of dye molecules occurs in P. V. A. film.
