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

Abstract

Summary: Blends of PEI and PPSU were prepared directly during the plasticization step of an injection molding process throughout the full composition range. The molded blends were transparent and showed a single glass transition and no dispersed phase by SEM. These characteristics did not allow the presence of a single miscibilized phase to be inferred unambiguously due to the very similar Tgs and refractive indices of the two components of the blends. Miscibility was inferred after close observation of the position, height and area of the enthalpy relaxation peak of the 50/50 blend. The modulus of elasticity and yield stress changed linearly with composition, leading to polymer materials with intermediate characteristics. The linearity was attributed to the lack of decrease in free volume induced by mixing and to the similar orientation of the components before and after mixing. The PPSU presence only slightly reduced the known tendency towards brittle fracture of PEI under notched impact conditions, but the presence of a single amorphous phase led to an expected ductile behavior of the blends close to that predicted by the single rule of mixtures.

A computational study of surface-directed phase separation in polymer blends under temperature gradient

“…) are lower than the average concentration, i.e., f ¼ 0.40, which is due to the z-direction diffusion of component A towards the wetting layer due to the attraction from the surface. This mechanism is similar to that of general SDPS [1][2][3][4][5][6][7][8]. However, at the edge of each stripe, the situation differs.…”

“…Since 1960s, there have been broad explorations of polymer blends in both manufacturing and academic laboratories all over the world on improving the properties of polymers by blending. Polymer blending is one of the most significant and simple techniques to make different improved-performance polymeric materials such as easier processability, better final properties and competitive pricing [3].…”

Extrusion of poly(ether imide) foams using pressurized CO2: Effects of imposition of supercritical conditions and nanosilica modifiers

“…Among various high‐performance engineering plastics, the polyimides offer ease of processing, high heat resistance and general chemical stability and are used in such demanding applications like fabrication of aircraft cabins, space vehicles, and automotive applications . Among the polyimides, poly(ether imide) (PEI) is widely used because of its relatively high modulus of elasticity , tensile strength , and low flammability . It has a high glass transition temperature range of around 215–220°C that is affected by cooling rate and pressure applied during solidification and a relatively low coefficient of thermal expansion at glassy state, i.e., 7.7 × 10 −8 m 3 /(kg K) .…”

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

“…Thus, studied miscible blends of PEI include those with poly(ether ether ketone) (PEEK), [7][8][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][15][16] polycarbonate of bisphenol A, [17] polyarylate, [18] an amorphous polyamide [19] and polysulfone of bisphenol A (PSU) [20] are partially miscible. The blends with poly(phenylene sulfide), [21] polyamide-6,6 [22,23] and liquid-crystal polymers [24,25] have been reported to be immiscible.…”

“…Many studies on PEI based blends have been carried out to ameliorate the global performance of the end products. 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.…”