Effects of transesterification on the crystallization and mechanical properties of PEN/PC blends.

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Title:	Effects of transesterification on the crystallization and mechanical properties of PEN/PC blends.
Authors:	Chen, Zhen¹, Xu, Liang¹, Bai, Yu², Wang, Wei², Qian, Junfeng¹, Yin, Xiaoliang¹, Du, Jizhou¹, Zhang, Jing¹ zhangjingyz@cczu.edu.cn
Source:	Express Polymer Letters. 2026, Vol. 20 Issue 7, p724-741. 18p.
Subjects:	Transesterification, Crystallization, Polymer blends, Mechanical behavior of materials, Materials science, Electric vehicles, Thermal stability
Abstract:	Conventional poly(ethylene terephthalate) (PET) and polycarbonate (PC) blends exhibit insufficient heat resistance, restricting their use in demanding applications such as new energy vehicles and portable consumer electronics. Poly(ethylene 2,6-naphthalate) (PEN) offers superior thermal stability, strength and chemical resistance, making PEN/PC blends promising alternatives. In this study, we investigated the relationships between the composition, structure and properties of PEN/PC blends through non-catalyzed melt blending. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectra (1H NMR) confirm transesterification between PEN and PC, with the extent of exchange (X) increasing with PC content. Non-isothermal differential scanning calorimetry (DSC) and X-ray diffraction (XRD) show that moderate PC content promotes crystallization, while high PC content suppresses it. Thermogravimetric analysis (TGA) shows enhanced thermal stability in PEN-rich blends. Compared to PET/PC, PEN/PC blends maintain similar tensile strength but exhibit 53% higher elongation and 1-2.5% lower density. This study demonstrates the potential of PEN/PC blends for high-performance, thin-walled applications in the new energy vehicle and electronics industries. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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Abstract:	Conventional poly(ethylene terephthalate) (PET) and polycarbonate (PC) blends exhibit insufficient heat resistance, restricting their use in demanding applications such as new energy vehicles and portable consumer electronics. Poly(ethylene 2,6-naphthalate) (PEN) offers superior thermal stability, strength and chemical resistance, making PEN/PC blends promising alternatives. In this study, we investigated the relationships between the composition, structure and properties of PEN/PC blends through non-catalyzed melt blending. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectra (1H NMR) confirm transesterification between PEN and PC, with the extent of exchange (X) increasing with PC content. Non-isothermal differential scanning calorimetry (DSC) and X-ray diffraction (XRD) show that moderate PC content promotes crystallization, while high PC content suppresses it. Thermogravimetric analysis (TGA) shows enhanced thermal stability in PEN-rich blends. Compared to PET/PC, PEN/PC blends maintain similar tensile strength but exhibit 53% higher elongation and 1-2.5% lower density. This study demonstrates the potential of PEN/PC blends for high-performance, thin-walled applications in the new energy vehicle and electronics industries. [ABSTRACT FROM AUTHOR]
ISSN:	1788618X
DOI:	10.3144/expresspolymlett.2026.55