Compatibilization of polyester/polyamide blends via catalytic ester‐amide interchange reaction

Abstract

In a series of publications we reported on melt rheology, morphology, and mechanical properties of the poly(ethylene terephthalate)/poly(amide‐6,6) blends (PET/PA). The non‐oriented samples had poor interphase bonding resulting in low impact and tensile strengths. To improve these properties the ester‐amide interchange reaction was carried out in solution and in melt. In the latter case a Brabender Plastograph was used in the mixing chamber or twin‐screw extruder configurations with p‐toluenesulfonic acid as a catalyst. The interchange reaction was followed by 400 MHz proton and 13C nuclear magnetic resonance spectroscopy.

Strategies for compatibilization of polymer blends

“…[114] Transamidation reactions between two PAs have been studied by, for example, Kricheldorf, [115,116] whereas Kotliar [117] has written an excellent general review paper on interchange reactions involving condensation polymers. The work by Pillon and Utracki [118,119] nicely demonstrates the efficiency of compatibilization by (limited) interchange reactions. Equimolar blends of PET and PA 6.6 were prepared in a twin screw extruder.…”

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

“…This indicates that polyester-polyamide copolymers are formed through an ester-amide interchange reaction during the melt blending of polyester and polyamide [32]. Other authors [33,34] have characterized the ester-amide interchange reaction of polyethylene terephthalate (PET) and polyamide (PA) catalyzed by p-toluenesulfonic acid using DSC, 1H…”

Impact behaviour of nylon-rubber blends: 5. Influence of the mechanical properties of the elastomer

“…When blending a poly-(ether ester) with the nylon, an ester-amide interchange reaction may occur. Pillon, Utracki et al 29'3° demonstrated experimentally the occurrence of this reaction in the blending process of poly(ethylene terephthalate) and polyamide-6,6. Since blends M8 to M11 scored postively in the Molau test and considering the small average the blends are plotted against the weight-average particle sizes in order to avoid this problem.…”