摘要
短切纤维与橡胶基体间的微观界面特性是影响绝热层性能的关键因素之一。以2种不同表面特性的短切纤维F-12、ASF-100和3种三元乙丙橡胶(EPDM3080、EPDM4045、EPDM2070)的绝热材料配方为研究对象,分别研究了短切纤维表面状态及形貌、EPDM生胶流变特性及门尼应力松弛、反映绝热材料填料分散特性的Payne效应和纤维/橡胶微观界面特性的混炼胶结合胶含量和硫化胶溶胀指数等,并分析了纤维表面特性、生胶流变特性对纤维在橡胶基体分散程度和纤维/橡胶微观界面特性的影响。结果表明,ASF-100相比于F-12表面活性含氧基团含量低且在介观尺度下聚集状态松散,而EPDM2070相比于EPDM4045和EPDM3080表现出更高的支化度和更明显的剪切变稀现象;通过Payne效应、混炼胶结合胶含量和硫化胶溶胀指数测试发现,ASF-100和EPDM2070配合形成的柔性绝热材料的填料分散性和微观界面特性相对良好,最后通过氧乙炔烧蚀数据证明了界面结合特性的提升能在一定程度上提高绝热材料烧蚀性能。所得结果可为绝热材料中短切纤维与橡胶基体结合特性的定量化表征和提升绝热材料烧蚀性能提供借鉴。
The micro interface characteristics between chopped fibers and rubber matrix are one of the key factors affecting the performance of the insulation layer.Two types of chopped fibers F-12,ASF-100 and three types of EPDM rubber(EPDM3080,EPDM4045,EPDM2070)with different surface characteristics were chosen as the research objects for insulation material formulations.The surface state and morphology of chopped fibers,the rheological properties of EPDM rubber and Mooney stress relaxation,the Payne effect reflecting the dispersion characteristics of insulation material fillers,the content of mixed bonding adhesive and the swelling index of vulcanized rubber micro interface characteristics were studied,and the influence of fiber surface characteristics and rubber rheological properties on the dispersion degree of fibers in the rubber matrix and the micro interface characteristics of fibers/rubber were analyzed.The results show that ASF-100 has a lower content of active oxygen-containing groups on its surface compared to F-12,and the aggregation state is loose at the mesoscale.On the other hand,EPDM2070 exhibites higher branching degree and more obvious shear thinning phenomenon compared to EPDM4045 and EPDM3080.Payne effect,mixed rubber binder content,and vulcanized rubber swelling index tests show that the filler dispersibility and micro interface characteristics of the flexible insulation material formed by the combination of ASF-100 and EPDM2070 are relatively good.Finally,the oxygen acetylene ablation data prove that the improvement of interface binding characteristics can improve the erosion resistance of the insulation material to a certain extent.The obtained results can provide relevant references for the quantitative characterization of the bonding characteristics between chopped fibers and rubber matrix in insulation materials,as well as for enhancing the ablation performance of insulation materials.
作者
白彦江
赵陆翔
赫丽娜
周鑫磊
徐艺璇
戴鑫
BAI Yanjiang;ZHAO Luxiang;HE Lina;ZHOU Xinlei;XU Yixuan;DAI Xin(National Key Laboratory of Aerospace Chemical Power,Inner Mongolia Research Institute of Synthetic Chemical Industry,Hohhot 010010,China)
出处
《固体火箭技术》
北大核心
2025年第4期624-633,共10页
Journal of Solid Rocket Technology
基金
国家级项目。
