Linear Viscoelastic Properties of a Poly(ary1ene ether ketone) with Various Molecular Weights

ABSTRACT A new poly(ary1ene ether ketone) polymer (PAE) has been synthesized. This polymer was prepared front the reaction of 1,3-bis(4-$luorobenzoyl)benzene with 2,2-bis(4-ltydroxyphenyl)propane. Dynamic rheological ineasure?nents were performed on a series of six PAE polymer ntelts with weight average molecular weight ( a w l ranging &om 9,600 to 113,000 ghnole and the linear viscoelastic properties were characterized. These stiff polymers behave like thermorheological simple fluids. A WLF type of equation was found to be adequate to describe their temperature dependent properties within 100°K above the polynter glass transition temperattires, Tg3. In the regime where the chain entanglement effects predominate, the dependence of zero shear viscosity on the Z w, qOoc&+', with p=5.13, was noted to be stronger than normally observed for polymers with jexible chains. The rate dependent viscosities for samples with dwerent %w can be superimposed to form a niaster curve by shifring along the reduced frequency axis. The sh $ factors are shown to be described by Graessley's theory based on molecular chain entanglements. 1