An aramid, prepared by the polycondensation of bis(4-aminophenyl) ether with isophthaloyl chloride, was found to render a single-phase mixture with poly(ether sulphone) (PES) by solution casting. Crystallization of the blend was studied by wide-angle X-ray diffraction, Hv light scattering, differential scanning calorimetry, Fourier-transform infra-red spectroscopy and scanning electron microscopy. The crystallization of aramid was found to be accelerated dramatically by adding PES, e.g. the crystallization rate constant of a 50/50 blend was shown to be one decade higher than that of neat aramid at around 310°C. The accelerated crystallization was ascribed to the elevation of chain mobility of aramid by blending with PES. It may be caused by the decrease of Tg via blending of a low-T~ component (PES), but this contribution was estimated to be small. The major contribution seems to be due to the partial dissociation of aramid-aramid interactions and the 'up-hill diffusion' associated with the liquid-liquid phase separation.
Посилання на статтю:
Aramid/poly(ether sulphone) blend: crystallization accelerated by the presence of amorphous polymer / Motoshi Matsuura, Hiromu Saito, Shoichi Nakata, Yoshio Imai andTakashi Inoue* // Polymer. – 1992. – Vol 33. – P. 3210-3214.