Preparation of fluorinated poly(benzoxazole-<i>co</i>-imide) with low dielectric constants based on the thermal rearrangement reaction of <i>o</i>-hydroxy polyimides

Li, Hong; Li, Xiyan; Yu, Jiali; Li, Yadong; Wang, Zhigang; Bao, Feng; Zhu, Caizhen; Xu, Jian

doi:10.1039/d3tc04195f

J. Mater. Chem. C

2024

DOI: 10.1039/d3tc04195f

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Preparation of fluorinated poly(benzoxazole-co-imide) with low dielectric constants based on the thermal rearrangement reaction of o-hydroxy polyimides

Hong Li,

Xiyan Li,

Jiali Yu

et al.

Abstract: This paper proposes a new strategy to prepare PIs with excellent overall performance by combining various modifications such as triphenyl pyridine structure, long-chain anhydride, trifluoromethyl, and thermal rearrangement reaction.

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Cited by 3 publications

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Synchronous improvement in mechanical properties and dielectric performance of poly(silylene arylether arylacetylene) by introducing trifluoromethyl groups

Gong,

Lv,

Liu

et al. 2024

Journal of Polymer Science

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Poly(silylene arylether arylacetylene) (PSEA) resin is a promising material for preparing an advanced wave‐transparent composite because of excellent thermal stability and good dielectric properties. Herein, a novel poly(silylene arylether arylacetylene) resin with trifluoromethyl groups (PSEAF) was synthesized by Grignard coupling reaction, and the effects of the incorporation of trifluoromethyl groups on various properties of PSEAF resin and quartz fiber reinforced composites were investigated. Compared to PSEA, the PSEAF resin exhibits better solubility and processability, and lower apparent activation energy for curing reactions. After thermal curing reactions, the PSEAF resin converts to an amorphous crosslinked network with the temperature at 5% weight loss (Td5) around 470 °C. The cured PSEAF resin possesses improved mechanical properties and dielectric properties. The flexural strength arrives at 64.4 MPa, and the dielectric constant (ε) and dielectric loss (tanδ) at 30 MHz are 2.75 and 4.3 × 10−3, respectively. Besides, the quartz fiber reinforced PSEAF composite simultaneously shows ε of 3.3, theoretical wave transmittance |T|2 of 91.4% at 7 GHz, and flexural strength of 350 MPa.

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Synchronous improvement in mechanical properties and dielectric performance of poly(silylene arylether arylacetylene) by introducing trifluoromethyl groups

Gong,

Lv,

Liu

et al. 2024

Journal of Polymer Science

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Polyimide-based thermal rearranged (TR) membrane for highly efficient natural gas separation: A review

Cai,

Chen,

Wang

et al. 2025

Separation and Purification Technology

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Enhancing mechanical and thermal properties of blends with novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide

Zhu,

Xu,

Sun

et al. 2024

High Performance Polymers

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A novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide (O-SPI) was synthesized and physically blended with thermoplastic polyimide (PI) to enhance both the thermal and mechanical properties of polyimide, addressing the growing demand for high-performance materials in harsh environments. The blend underwent conversion to semi-Interpenetrating Polymer Networks ( semi-IPNs) and benzoxazole structures through thermal curing of reactive phenylethynyl groups and thermal rearrangement of ortho-hydroxy imide units. The trends in thermal and mechanical properties were investigated in relation to the chemical structures and varying mass fraction of O-SPI. The covalent incorporation of semi-IPNs and rigid benzoxazole structures restrict segmental motion while the backbone linkage confers the toughness of the blends. These synergistic effects insure the cured blends with high glass transition temperatures (472.51°C) and tensile strength (117.81 MPa) simultaneously, demonstrating their potential for applications in challenging conditions.

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Preparation of fluorinated poly(benzoxazole-co-imide) with low dielectric constants based on the thermal rearrangement reaction of o-hydroxy polyimides

Abstract: This paper proposes a new strategy to prepare PIs with excellent overall performance by combining various modifications such as triphenyl pyridine structure, long-chain anhydride, trifluoromethyl, and thermal rearrangement reaction.

Cited by 3 publications

References 43 publications

Synchronous improvement in mechanical properties and dielectric performance of poly(silylene arylether arylacetylene) by introducing trifluoromethyl groups

Synchronous improvement in mechanical properties and dielectric performance of poly(silylene arylether arylacetylene) by introducing trifluoromethyl groups

Polyimide-based thermal rearranged (TR) membrane for highly efficient natural gas separation: A review

Enhancing mechanical and thermal properties of blends with novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide

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