通过有机-无机混合方法同时增强邻苯二腈树脂的热性能和介电性质

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-11-18 DOI:10.1016/j.reactfunctpolym.2024.106105

Beibei Ji, Jiajie Lyu, Yue Pan, Changping Yin, Wei Liao, Suli Xing, Nan Wu

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引用次数: 0

摘要

在航空航天领域，高性能邻苯二腈（PN）树脂的使用越来越普遍。然而，如何在高频率下实现低介电常数与高热稳定性之间的平衡仍是一个挑战。本研究提出了一种有机-无机混合方法，通过共价键将环氧多面体低聚硅倍半氧烷（EP-POSS）均匀分散到 PN 树脂中，从而同步改善树脂的热性能和介电性能。结果表明，EP-POSS 显著影响了 PN 树脂的固化机理，交联网络的主体结构由三嗪变成了低极性、更稳定的酞菁。与纯 PN 树脂相比，含 1 wt% EP-POSS 的样品在 10.5 GHz 频率下的介电常数和介电损耗分别从 3.55 和 0.013 降至 3.37 和 0.006。此外，含 POSS 的聚合物具有优异的热稳定性和热氧化稳定性，Td5% 为 564-567 ℃，Tg 超过 500 ℃。高温烧结过程中在树脂表面形成的二氧化硅层有效地保护了结构的完整性。这项研究为 PN 树脂在极端环境中的开发和应用提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Simultaneous enhancement of thermal and dielectric properties of phthalonitrile resin via an organic-inorganic hybrid approach

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Simultaneous enhancement of thermal and dielectric properties of phthalonitrile resin via an organic-inorganic hybrid approach

The usage of high-performance phthalonitrile (PN) resin has become increasingly common in the aerospace fields. However, achieving the balance between low dielectric under high frequency and high thermal stability remains a challenge. This study presented an organic-inorganic hybrid method to improve synchronously the thermal and dielectric properties of the resin, via the covalent bond to uniformly disperse epoxy polyhedral oligomeric silsesquioxanes (EP-POSS) into PN resin. The results indicate that EP-POSS significantly affect the curing mechanism of PN resin, and the main structure of cross-linking network changes from triazine to low polarity and more stable phthalocyanine. Compared to pure PN resin, the dielectric constant and dielectric loss at 10.5 GHz of the sample containing 1 wt% EP-POSS reduced from 3.55 and 0.013 to 3.37 and 0.006. Furthermore, POSS-containing polymers presented superior thermal and thermal oxidation stability with T_d5% of 564–567 °C and T_g above 500 °C. The formed SiO₂ layer on the resin surface during the high-temperature sintering protected the structural integrity effectively. This study provides novel insights into the development and application of PN resin in extreme environments.

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.