Elsevier

Polymer

Volume 30, Issue 5, May 1989, Pages 893-896
Polymer

Polymer paper
A mechanism describing polyamic acid solution viscosity change on storage at high temperature

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Abstract

The storage of polyamic acid solution at high temperature is known to bring about a decrease in solution viscosity. This paper describes an investigation of a factor of this viscosity change at 80°C for polyamic acid solution derived from 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride and p-phenylene diamine in N-methyl-2-pyrrolidone. This reduction of viscosity was caused by a weight-average molecular weight reduction. The relationship between weight-average molecular weight measured by a light scattering method and 10 wt% solution viscosity, η, at 25°C could be described as η = 4.29 × 10−17M3.35.

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Cited by (26)

  • Understanding the viscosity decline of poly(amic acid) solution from the correlation point of view

    2020, Polymer
    Citation Excerpt :

    This interaction can be changed due to physical relaxation during storage, and this can also lead to the reduction of poly(amic acid) viscosity. An alternative way to gain absolute molecular weight is by static light scattering (SLS) method [12–14]. However, to apply SLS, the increment of refractive index is required as one input parameter, which is not a constant when the solution is going through a thermodynamic/kinetic transition.

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