Correlation of the morphology and thermooxidative degradation behavior of poly(ethylene terephthalate)–nitrile butadiene rubber–polycarbonate ternary blends

Abstract

In this study, we prepared ternary poly(ethylene terephthalate) (PET)–nitrile butadiene rubber (NBR)–polycarbonate (PC) blends through a molten mixing procedure, and with a corotating extruder, we studied the morphology and thermodynamic properties of each purified polymer and the binary and ternary blends with different compositions. Dynamic mechanical analysis of both the PET–PC and PET–NBR samples showed individual loss peaks for each component, but in different ternary samples, the effects of different percentages of components (PC–PC and PET–NBR) were observed; this revealed changes in the loss peak locations. Individual loss peaks of PET and PC in the ternary PET–NBR–PC blends (81/9/10 and 63/30/7)—proof of the miscibility of the samples—were also observed in this study. The thermal properties of the samples were measured and examined with the thermogravimetric analysis and differential thermogravimetry testing methods. The activation energy and order of reaction values for the samples under an air atmosphere with single‐rate methods of heating were studied. Finally, the relation between the type of morphology and the thermal degradation behavior was investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47171.

Compatibilization of Polycarbonate/Silicon Rubber Blend with Styrene/Silicon Oil/Acrylonitrile Ternary Copolymer for Ultra-High Low-Temperature Toughness

“…According to the sensitivity of the stress–strain relationship at the notch, its failure mechanism can change from shear yielding to crazing, or directly brittle fracture . The most effective way to improve the toughness and reduce the notch sensitivity of PC is to mix low-modulus components, such as the commonly used rubber, which can eliminate the plane strain constraint and deformation nonlocality by inducing cavities, promoting shearing deformation, and improving the notch impact strength. − …”

Compatibility and toughening mechanism of poly(ethylene terephthalate)/polycarbonate blends

“…15,16 Polycarbonate (PC), as an engineering thermoplastic with superior performance, not only simultaneously possesses high stiffness and impact toughness but also presents prominent optical properties and transparency. 17,18 Theoretically, the molecular chains of PET and PC both contain benzene ring and ester group structures with high structural similarity, which provides an effective solution for the poor impact toughness of PET while maintaining its good transparency. However, PET is a crystalline polymer with a slow crystallization rate while PC is a transparent amorphous polymer, and therefore the improvement in toughness of PET/PC blends is not significant due to the incompatibility in the aggregation structure.…”