Synthesis and Characterization of Hyperbranched Polyazomethine Ablators for Space Exploration Applications
Synthesis and Characterization of Hyperbranched Polyazomethine Ablators for Space Exploration Applications
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用于太空探索应用的超支化聚偶氮甲碱烧蚀剂的合成和表征
DOI：
10.2514/1.t4319
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Splinter
中科院分区：
文献类型：
--
作者：
D. Tigelaar;Matthew J. Degges;K. Chuang;F. Hurwitz;K. Kuo;D. Scheiman;L. McCorkle;Derek J. Quade;Stephanie L. Vivod;S. Splinter
制备了一系列新型烧蚀复合材料，其中含有在碳纤维预制体（HyPAZA）内合成的超支化聚甲亚胺，其密度与酚醛浸渍碳烧蚀剂相似（~ 0.3 g/cc）。提出了一种合成强超支化聚甲亚胺热固性材料的新方法，首次将聚甲亚胺应用于烧蚀材料的研究。几种配方的HyPAZA表现优于酚醛浸渍碳烧蚀剂的聚合物焦炭产量，复合材料的机械强度，在550和1100 W/cm 2的热通量的CO2激光烧蚀测试，和小规模电弧喷射测试在400 W/cm 2的热通量。通过热重分析，超支化聚甲亚胺在1000°C下的残炭率高达79%。这是有史以来报道的全有机聚合物的最高炭产率之一。一些HyPAZA复合材料比碳纤维预制件强10倍以上，如通过压缩测试所确定的。还在电弧喷射发动机中测试了样本..
A novel series of ablative composites containing a hyperbranched polyazomethine synthesized inside a carbon fiber preform (HyPAZA) were prepared, which have similar density to phenolic impregnated carbon ablators (∼0.3 g/cc). A novel method of synthesizing strong hyperbranched polyazomethine thermosets has been developed, enabling polyazomethines to be studied in ablators for the first time. Several formulations of HyPAZA perform better than the phenolic impregnated carbon ablator in terms of polymer char yield, composite mechanical strength, CO2 laser ablation tests at heat fluxes of 550 and 1100 W/cm2, and small-scale arcjet testing at a heat flux of 400 W/cm2. Char yields of hyperbranched polyazomethines were as high as 79% at 1000°C by thermogravimetric analysis. This is one of the highest char yields ever reported for a fully organic polymer. Some HyPAZA composites are over 10 times stronger than the carbon fiber preform, as determined by compression tests. Specimens were also tested in an arcjet ...