Poly(ester imide)s with Low Linear Coefficients of Thermal Expansion and Low Water Uptake (VII): A Strategy to Achieve Ultra-Low Dissipation Factors at 10 GHz

Hasegawa, Masatoshi; Fukuda, Taro; Ishii, Junichi

doi:10.3390/polym16050653

Cited by 4 publications

(1 citation statement)

References 60 publications

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“…With the development of next-generation communication technologies, polymer materials with a low dielectric constant (D k ) and low dielectric loss (D f ) are urgently needed for high-speed communication devices [ 1 ]. Meanwhile, they are required to meet various other criteria, including moisture uptake, high-temperature resistance, mechanical properties, dimensional accuracy, and so on [ 2 , 3 ]. As part of high-performance engineering plastics, polyphthalamides (PPA) are mainly synthesized through polycondensation reactions between aliphatic diamines and aromatic acids.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PA10T/PPO Blends Compatibilized with SEBS-g-MAH

Xia,

Jiang,

Tang

et al. 2024

Polymers

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Plant-derived PA10T is regarded as one of the most promising semi-aromatic polyamides; however, shortcomings, including low dimensional accuracy, high moisture absorption, and relatively high dielectric constant and loss, have impeded its extensive utilization. Polymer blending is a versatile and cost-effective method to fabricate new polymeric materials with excellent comprehensive performance. In this study, various ratios of PA10T/PPO blends were fabricated via melt blending with the addition of a SEBS-g-MAH compatibilizer. Molau test and scanning electron microscopy (SEM) were employed to study the influence of SEBS-g-MAH on the compatibility of PA10T and PPO. These studies indicated that SEBS-g-MAH effectively refines the domain size of the dispersed PPO phase and improves the dispersion stability of PPO particles within a hexafluoroisopropanol solvent. This result was attributed to the in situ formation of the SEBS-g-PA10T copolymer, which serves as a compatibilizer. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results showed that the melting–crystallization behavior and thermal stability of blends closely resembled that of pure PA10T. Dynamic mechanical analysis (DMA) revealed that as the PPO content increased, there was a decrease in the glass transition temperature and storage modulus of PA10T. The water absorption rate, injection molding shrinkage, dielectric properties, and mechanical strength of blends were also systematically investigated. As the PPO content increased from 10% to 40%, the dielectric loss at 2.5 GHz decreased significantly from 0.00866 to 0.00572, while the notched Izod impact strength increased from 7.9 kJ/m2 to 13.7 kJ/m2.

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Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PA10T/PPO Blends Compatibilized with SEBS-g-MAH

Xia,

Jiang,

Tang

et al. 2024

Polymers

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Construction of polyimide films with highly linear structures using a structural reorganization approach

Li,

Ke,

et al. 2024

J of Applied Polymer Sci

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To improve the thermodynamic and mechanical properties of asymmetric polyimide (PI), a method to enhance the linearity of PI by using a structural reorganization approach was designed. First, two novel diamines containing benzimidazole and benzoxazole groups, namely PADBZ and PDBOA, were constructed and synthesized. Thereafter, two new kinds of PI films (PADBZ‐PMDA and PDBOA‐PMDA) were prepared and polymerized with 1,2,4,5‐benzenetetracarboxylic anhydride (PMDA). Based on structural reorganization, PADBZ‐PMDA and PDBOA‐PMDA had repeating units of the same chemical composition and different linearity with PABZ‐BPDA and BOA‐BPDA, respectively. Comparing PADBZ‐PMDA and PABZ‐BPDA, due to the transfer in the position of benzene, PADBZ‐PMDA with high linearity showed the improved heat resistance (Tg up to 448°C), dimensional stability (CTE down to 2.3 ppm/K) and mechanical properties. PDBOA‐PMDA and BOA‐BPDA had the same situation. This study provided a unique solution to enhance the performances of PI by increasing the linearity using a structural reorganization approach.

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