Phase Structure and Mechanical Properties of Blends of Poly(ether imide) and Bisphenol A Polycarbonate

Abstract

Poly(ether imide) (PEI)/bisphenol A polycarbonate (PC) blends were obtained throughout the composition range both by direct injection moulding (DI blends) and by extrusion followed by injection moulding (PM blends). Although some reaction was observed by FT IR, the blends were fully phase separated at the detection level of DMTA. An anomalous decrease in the high temperature T g of the 90/10 and 80/20 blends, was only seen in PM blends. This was attributed to an anomalous thermodynamic behaviour, after rejecting degradation, reactions or particle size as possible explanations. With the exception of the PC-rich DI blends, the morphology was fine and homogeneous. Both the modulus of elasticity and the yield stress were very close to those expected from the rule of mixtures, whatever the morphology. Unexpectedly, ductility followed the same trend, even in the less homogeneous PC-rich DI blends. This points to the very slight reactions observed, and to parameters related to chemical features of the components (such as the highly aromatic character of the components of the blend) as the main reasons for the observed ductility behaviour. [DOI 10.1295/polymj.36.705] KEY WORDS Poly(ether imide) / Polycarbonate / Blends / Mechanical Properties / Phase Structure / Blending thermoplastic polymers 1,2 to obtain multicomponent materials is one of the most useful ways to develop new polymeric materials. This is because the costs associated with the development of a new polymer do not usually compensate the likely profit. Moreover, the preparation and development of blends based on commercial polymers requires less time for the optimisation of the final product. Usually, the components of a blend are selected looking at complementary characteristics in processability, final properties or price. Thus, polymer blending can allow the combination, for example, of an expensive high performance polymer with a cheaper one, to obtain the expected performance at an advantageous cost.Poly(ether imide) (PEI) is a high performance amorphous thermoplastic with good thermal stability (T g ¼ 220 C) and remarkable modulus of elasticity and tensile strength. 3 It is used, among other applications, for advanced parts in electrical and electronics industry, in aircraft applications and in the automotive industry. Blends of PEI with poly(ether ether ketone) (PEEK), 4-6 aliphatic-aromatic polyesters, 7-20 polyarylate (PAr), 21,22 polyamide 6,6, 23,24 poly(phenylene sulphide) (PPS) and polysulfone of bisphenol A (PSU), 25 among others, have been studied and several patents 26 with polymers such as polycarbonate, polyamides, polypropylene, polysulfones and liquid crystal polymers, have been granted.Bisphenol A polycarbonate (PC) is an engineering thermoplastic with applications in a wide variety of fields, such as electronics, illuminating engineering, household, automotive industry, sports, security elements, etc. Its blends with many other polymers have been studied 27,28 or registered, 26 and some of them such as those with poly(ethylene terepht...

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

“…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 PET [14] or PAr [18] were slightly synergistic, those with PSU [20] were fully linear, and that based on PC [17] was slightly below additivity.…”

“…Other parameters such as Poisson's ratio or the thermal expansion coefficient, should have different effects when the nature of the matrix changes. [17,47] The fact that the behavior is similar in the whole composition range rules out any possible influence of these parameters. As both a decrease in orientation [48] and a decrease in mixing-induced free volume [46,48] should lead to ductility decreases and both of these are present in the blends, these parameters are proposed as being responsible for the observed ductility behavior.…”

Characterizations of Copoly(ester imide)s with New 2,7-Dihydroxynaphthalene Bis(trimellitate anhydride)

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A new method to prepare low melting point polyamide‐6 and study crystallization behavior of polyamide‐6/calcium chloride complex by rheological method

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