The evaluation of an inorganic-organic poly(carborane-siloxane-arylacetylene) hybrid resin system

IF 1.8 4区化学 Q3 POLYMER SCIENCE

High Performance Polymers Pub Date : 2022-11-17 DOI:10.1177/09540083221140015

W. Monzel, Kyle Berglund, M. Kolel-Veetil, D. Simone, T. Gibson

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Abstract

The realization of aerospace vehicle technologies demanding extreme service conditions is facilitated by the development of materials with greater oxidative stability at high temperatures. Thermal performance of polymer composites can be increased by incorporating a hybrid (organic-inorganic) resin as a thermal barrier coating. One such resin system, meta-poly (carborane-siloxane-arylacetylene) (m-PCSAA), developed by the U.S. Naval Research Laboratory, shows potential for such application and is further investigated in this work. The resin has a low viscosity (0.1 Pa s) with large processing window (2.5 h) from 100°C to 230°C. These processing characteristics are advantageous for infusion processes or the inclusion of fillers for coating applications. Curing was accomplished in two stages, corresponding to two exothermic reactions. After the first curing stage, the resin exhibits elastomeric behavior, and after the second curing stage is rigid with a high glass transition temperature (∼330°C). The materials exhibited high char yields (89%) in air at 1000°C and may be useful in space or for attritable technology. No cracks were observed during long-term service at 288°C, but significant degradation and cracking were observed after aging at 316°C. The materials exhibited high coefficients of thermal expansion; 186.9 and 168.6 μm/(m∙°C) after first and second curing stage respectively. Similar to epoxies and polyimides, the resin acquired up to 3% moisture at 70°C and 85% relative humidity.

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无机-有机聚碳硼烷-硅氧烷-芳基乙炔杂化树脂体系的评价

在高温下具有更大氧化稳定性的材料的发展促进了对极端使用条件要求的航空航天飞行器技术的实现。聚合物复合材料的热性能可以通过加入混合(有机-无机)树脂作为热障涂层来提高。由美国海军研究实验室开发的一种这样的树脂体系，间聚(碳硼烷-硅氧烷-芳基乙炔)(m-PCSAA)，显示了这种应用的潜力，并在这项工作中得到了进一步的研究。该树脂具有低粘度(0.1 Pa s)，在100°C至230°C范围内具有大的加工窗口(2.5 h)。这些加工特性有利于灌注工艺或包含用于涂层应用的填料。固化分两个阶段完成，对应于两个放热反应。在第一阶段固化后，树脂表现出弹性体行为，在第二阶段固化后，树脂具有高玻璃化转变温度(~ 330°C)的刚性。该材料在1000°C的空气中表现出高炭产率(89%)，可用于太空或可降解技术。在288℃长期使用期间未观察到裂纹，但在316℃时效后出现了明显的降解和裂纹。材料表现出较高的热膨胀系数;第一期和第二期固化后的温度分别为186.9和168.6 μm/(m∙°C)。与环氧树脂和聚酰亚胺类似，该树脂在70°C和85%的相对湿度下可获得高达3%的水分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Performance Polymers 化学-高分子科学

CiteScore

4.20

自引率

14.30%

发文量

106

审稿时长

1.2 months

期刊介绍： Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.

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