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Structure–Property Relationships in PEI/PET Polymer Blends: Morphological, Rheological, Thermal, Mechanical Behavior, and Electromagnetic Response

E. O. KhakberdievInstitute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, Tashkent 100174, UzbekistanHülya Kaftelen‐OdabaşıDepartment of Aircraft Maintenance and Repair, School of Civil Aviation, Fırat University, 23200 Elazığ, TurkeyAkın OdabaşıDepartment of Metallurgical and Materials Engineering, Engineering Faculty, Fırat University, 23200 Elazığ, TurkeySelçuk HelhelDepartment of Electrical & Electronics Engineering, Engineering Faculty, Akdeniz University, 07058 Antalya, TurkeyQ. N. BerdinazarovInstitute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, Tashkent 100174, UzbekistanN. Z. DusiyorovInstitute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, Tashkent 100174, UzbekistanN. R. AshurovInstitute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, Tashkent 100174, Uzbekistan

2026en

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Litsenziya: cc-by

ABI

Annotatsiya

%) were investigated to elucidate the composition-property relationship governed by morphological, structural, rheological, thermomechanical, mechanical, and electromagnetic shielding (EMI) performance behavior. Among other polymer blends, the 70/30 blend exhibits superior thermomechanical stability with a significant glass transition temperature of 132.7 °C, where a robust confinement effect effectively restricts the mobility of PET chains. This morphology, characterized by a domain size of 562 nm, provides proof of concept for interface-driven attenuation, reaching a maximum EMI shielding effectiveness of 2.54 dB within the investigated blends. This performance is primarily governed by Maxwell-Wagner-Sillars polarization at the immiscible boundaries, alongside an optimized dielectric loss of tan δ ≈ 0.065. The design of these high-temperature PEI blends provides a proof of concept for interface-driven attenuation and demonstrates their potential for developing advanced EMI shielding matrices.

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DOI: 10.3390/polym18121528

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