聚乙烯基倍半硅氧烷及其可瓷化复合材料的制备与性能
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作者单位:

1.先进功能复合材料技术重点实验室,航天材料及工艺研究所,北京 100076;2.中国科学院化学研究所,北京 100190


Synthesis and Properties of Polyvinylsilsesquioxane and Its Ceramifiable Composites
Author:
Affiliation:

1.Science and Technology on Advanced Functional Composites Laboratory,Aerospace Research Institute of Materials & Processing Technology,Beijing 100076;2.Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190

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    摘要:

    以乙烯基三甲氧基硅氧烷(VTMS)为单体,采用水解缩合的方法制备了聚乙烯基倍半硅氧烷(PVSQ),对PVSQ的固化机制、固化温度以及热稳定性进行研究。结果表明以低毒性的乙醇取代甲苯为溶剂、能于150 ℃中温固化的PVSQ可作为硅基可瓷化防热复合材料的基体使用。通过SEM、EDS、XRD对添加TiB2、云母等成瓷填料制备的PVSQ复合材料的陶瓷化性能进行研究。结果表明材料在800~1 200 ℃热处理30 min后失重率仅为0.29%~4.15%,体积收缩率为5.20%~15.08%,高温下成瓷填料与材料热解产物之间发生原位陶瓷化反应,产生大量玻璃相起到基体桥接作用,促进尺寸、形状稳定的陶瓷体形成。

    Abstract:

    Polyvinylsilsesquioxane(PVSQ) was synthesized with hydrolysis-polycondensation method from vinyltrimethoxysiloxane (VTMS),and the curing mechanism, curing temperature and thermal stability of PVSQ were studied.The results show that PVSQ,which use ethanol as solvent and be curable at 150 ℃,can be used as the matrix of silicone-based ceramifiable composites for thermal protection applications.Combined with ceramifiable fillers (e.g.,TiB2,mica,etc.),the in-situ ceramization process of PVSQ ceramifiable composites was studied by SEM, EDS and XRD.The results indicate that the weight loss of PVSQ composites is only 0.29wt% to 4.15wt% and the volumetric shrinkage is 5.20vol% to 15.08vol% when annealed at 800 to 1 200 ℃ for 30 min.The in-situ ceramization reaction take place between the ceramifiable fillers and the pyrolytic products of PVSQ at high temperatures,and generate a large amount of glassy phase for matrix bridging, which further leads to the formation of dimensionally-stable ceramic product.

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程治硚,王开石,匡松连,韩伟健.聚乙烯基倍半硅氧烷及其可瓷化复合材料的制备与性能[J].宇航材料工艺,2019,49(1):52-57.

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  • 收稿日期:2018-07-10
  • 最后修改日期:2019-01-03
  • 录用日期:2018-09-10
  • 在线发布日期: 2019-02-18
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《宇航材料工艺》2025年青年编委招募启事

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