纤维特性对石英纤维毡增强二氧化硅-聚苯并恶嗪气凝胶复合材料结构和性能的影响

IF 5 3区 化学 Q1 POLYMER SCIENCE Gels Pub Date : 2024-09-24 DOI:10.3390/gels10100613
Lanfang Liu, Liangjun Li, Yijie Hu, Junzong Feng, Yonggang Jiang, Jian Feng
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引用次数: 0

摘要

纤维增强气凝胶复合材料被广泛用于热防护。纤维的特性对最终气凝胶复合材料的结构和性能起着至关重要的作用。然而,纤维特性对气凝胶复合材料结构和性能的影响却鲜有研究。在此,我们采用简单的共聚工艺和常压干燥法制备了不同纤维直径的石英纤维毡增强二氧化硅-聚苯并噁嗪气凝胶复合材料(QF/PBSAs)。研究了纤维直径对气凝胶复合材料结构和性能影响的原因。结果表明,气凝胶复合材料的孔隙结构受到纤维直径的影响,导致其力学性能和隔热性能发生显著变化。室温下,孔隙结构和密度是影响复合材料热导率的主要因素。在高温条件下,辐射导热系数(λr)起主导作用,减小纤维直径会抑制λr,从而降低导热系数。当 QF/PBSAs 暴露在 1200 °C 丁烷火焰中时,PBS 气凝胶发生热解,热解气体带走大量热量并在界面层中形成热障,此时λr 和 PBS 气凝胶的热解共同决定了复合材料的背面温度。本研究的结果可为聚苯并恶嗪气凝胶复合材料在热防护领域的应用提供有价值的指导。
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Effect of Fiber Characteristics on the Structure and Properties of Quartz Fiber Felt Reinforced Silica-Polybenzoxazine Aerogel Composites.

Fiber-reinforced aerogel composites are widely used for thermal protection. The properties of the fibers play a critical role in determining the structure and properties of the final aerogel composite. However, the effects of the fiber's characteristics on the structure and properties of the aerogel composite have rarely been studied. Herein, we prepared quartz fiber felt-reinforced silica-polybenzoxazine aerogel composite (QF/PBSAs) with different fiber diameters using a simple copolymerization process with the ambient pressure drying method. The reasons for the effects of fiber diameter on the structure and properties of the aerogel composites were investigated. The results showed that the pore structure of the aerogel composites was affected by the fiber diameter, which led to significant changes in the mechanical behavior and thermal insulation performance. At room temperature, pore structure and density were found to be the main factors influencing the thermal conductivity of the composites. At elevated temperatures, the radiative thermal conductivity (λr) plays a dominant role, and reducing the fiber diameter suppressed λr, thus decreasing the thermal conductivity. When the QF/PBSAs were exposed to a 1200 °C butane flame, the PBS aerogel was pyrolyzed, and the pyrolysis gas carried away a large amount of heat and formed a thermal barrier in the interfacial layer, at which time λr and the pyrolysis of the PBS aerogel jointly determined the backside temperature of the composites. The results of this study can provide valuable guidance for the application of polybenzoxazine aerogel composites in the field of thermal protection.

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来源期刊
Gels
Gels POLYMER SCIENCE-
CiteScore
4.70
自引率
19.60%
发文量
707
审稿时长
11 weeks
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