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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]
Copyright of Express Polymer Letters is the property of Budapest University of Technology & Economics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Effects of transesterification on the crystallization and mechanical properties of PEN/PC blends.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Zhen%22">Chen, Zhen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xu%2C+Liang%22">Xu, Liang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bai%2C+Yu%22">Bai, Yu</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Wei%22">Wang, Wei</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Qian%2C+Junfeng%22">Qian, Junfeng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yin%2C+Xiaoliang%22">Yin, Xiaoliang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Du%2C+Jizhou%22">Du, Jizhou</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jing%22">Zhang, Jing</searchLink><relatesTo>1</relatesTo><i> zhangjingyz@cczu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Express+Polymer+Letters%22">Express Polymer Letters</searchLink>. 2026, Vol. 20 Issue 7, p724-741. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Transesterification%22">Transesterification</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+blends%22">Polymer blends</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Materials+science%22">Materials science</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+vehicles%22">Electric vehicles</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink>
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Express Polymer Letters is the property of Budapest University of Technology & Economics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3144/expresspolymlett.2026.55
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      – SubjectFull: Polymer blends
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Materials science
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      – SubjectFull: Electric vehicles
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      – SubjectFull: Thermal stability
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      – TitleFull: Effects of transesterification on the crystallization and mechanical properties of PEN/PC blends.
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              M: 07
              Text: 2026
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