Miscibility level and properties of poly(ether imide)/poly(ethylene terephthalate) blends

Abstract

Blends composed of poly(ether imide) and poly(ethylene terephthalate) were obtained both by kneading followed by compression molding and by direct injection molding. Both procedures gave rise, probably at all compositions, to biphasic structures with similar homogeneity that showed wide single Tg peaks by dynamic‐mechanical analysis. The modulus of elasticity and the yield stress values appeared, respectively, close to and above those predicted by the additivity rule, probably due to the density increase and slight orientation observed. The ductility values against composition appeared well below the additive values, probably due to the presence of a dispersed phase together with the notch‐sensitive nature of the blends. © 1996 John Wiley & Sons, Inc.

Processability, Structure and Mechanical Properties of Poly(ether imide)/Amorphous Copolyester Blends

“…However, the full miscibility of the blends was questioned because the 70, 80 and 90% PCTG blends were not fully transparent and mainly, because the T g region of the blends widened when compared to that of the neat components. A similar widening was obtained in the partially miscible PEI/PET blends 14. The widening, measured by the width at the half height of the tan δ peaks, is shown in Figure 4.…”

“…Modulus values near linearity are a common result in partially miscible blends such as some of those based on PEI. Thus, among the partially miscible PEI based blends, the moduli of those with either PET14 or PAr18 were slightly synergistic, those with PSU20 were fully linear, and that based on PC17 was slightly below additivity.…”

“…Thus, studied miscible blends of PEI include those with poly(ether ether ketone) (PEEK),7–9 poly(butylene terephthalate) (PBT),4, 5 poly(trimethylene terephthalate) (PTT),10 poly(ethylene naphthalate) (PEN),11 poly(butylene naphthalate)12 and polyphenylsulfone 13. Blends with poly(ethylene terephthalate) (PET),14–16 polycarbonate of bisphenol A,17 polyarylate,18 an amorphous polyamide19 and polysulfone of bisphenol A (PSU)20 are partially miscible. The blends with poly(phenylene sulfide),21 polyamide‐6,622, 23 and liquid‐crystal polymers24, 25 have been reported to be immiscible.…”

“…It is known that these undesirable sorption and property changes may be reduced by blending 30. Finally, PEI is fully miscible with polyesters as PTT10 and PBT,4, 5 and partially miscible with PET;14–16 thus, assuring mechanical compatibility.…”

New Miscible Poly(ether imide)/Poly(phenyl sulfone) Blends

“…However, it is highly notch sensitive and difficult to process. Miscible blends of PEI with poly(ether ether ketone)2–4 and aliphatic‐aromatic polyesters,5–8 partially miscible blends with polyarylate9,10 and poly(ethylene terephthalate),11 and immiscible blends with polyamide 6,6,12,13 poly(phenylene sulfide) and polysulfone of bisphenol A14 and liquid crystal polymers,15–18 among others, have been reported.…”