共查询到19条相似文献,搜索用时 272 毫秒
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通过室温硫化(RTV)法制备了不同泡孔直径的石墨烯/有机硅橡胶泡沫复合材料。提出了一种制备不同发泡倍数的双组分室温硫化加成型有机硅橡胶泡沫复合材料的工艺;讨论了石墨烯含量、发泡倍数、泡孔的数目和尺寸对室温硫化硅橡胶泡沫介电性能的影响。结果表明,在同一发泡倍数下,介电常数随石墨烯的添加量增加而增加,达到阈值后降低;在同一石墨烯添加量下,泡孔尺寸和泡孔数目有着不同贡献:直径、泡孔数目较少时,介电常数降低,泡孔的总数和大孔的占比较多时,介电性能最佳。此外含有石墨烯的有机硅橡胶泡沫复合材料较纯硅橡胶泡沫而言,其介电常数提升了6倍左右,同时保持着较低的介电损耗。 相似文献
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以碳纳米管(CNT)作为核,密胺树脂(MF)作为壳,苯乙烯马来酸酐共聚物(SMA)为乳化剂,原位聚合制备微胶囊化碳纳米管(CNT-MF),并将包覆后的碳纳米管作为填料添加到硅橡胶泡沫中,制备了CNT-MF/硅橡胶泡沫复合材料。探讨了核/壳质量比对微胶囊化碳纳米管的包覆效果的影响,同时研究了微胶囊化碳纳米管用量对硅橡胶泡沫泡孔结构和介电性能的影响。结果表明,微胶囊化碳纳米管的加入有利于提高复合材料的泡孔结构,大泡孔的存在和泡孔面积有利于材料介电性能的提高。当核/壳质量比为1∶10的微胶囊化碳纳米管添加量为15 phr时,复合材料介电性能表现最佳,此时复合材料在1 kHz的介电常数为26.34,介电损耗仅为0.013 6。 相似文献
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采用氧化石墨烯(GO)包覆硫黄微胶囊,研究了GO包覆硫黄微胶囊作硫化剂对乳聚丁苯橡胶(ESBR)硫化特性及力学性能的影响。结果表明,GO/硫黄(质量比)为90/10时,硫黄可以完全被GO包覆,并可制得热稳定性较佳的GO包覆硫黄微胶囊。相比于硫黄,GO包覆硫黄微胶囊/ESBR混炼胶的硫化时间延长,硫化速率下降,GO包覆硫黄微胶囊/ESBR硫化胶的拉伸强度由硫黄/ESBR硫化胶的16.37 MPa提高至17.66 MPa,300%定伸应力由11.69 MPa提高至12.71 MPa。 相似文献
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阻燃剂微胶囊技术的研究 总被引:14,自引:0,他引:14
以三聚氰胺-甲醛树脂为囊壁材料,以苯乙烯-马来酸酐树脂为分散剂,制备了十溴联苯醚/三氧化二锑、三(β-氯乙基)磷酸酯两类微胶囊阻燃剂。测试了它们应用于聚氨酯硬泡中的阻燃性能。结果表明,三(β-氯乙基)磷酸酯微胶囊具有良好的阻燃性能。 相似文献
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低模量硫化硅橡胶粘接研究 总被引:2,自引:0,他引:2
采用sol—gel工艺自制的SiO2补强增韧环氧树脂作为胶粘剂,对低模量硫化硅橡胶与金属或复合材料进行粘接试验,分析胶粘剂中SiO2理论含量及粘接工艺对粘接性能的影响,并把硫化硅橡胶放在改性环氧树脂中进行溶张试验,探索胶粘剂对硅橡胶的粘接机理、结果表明,随着SiO2先驱体-有机硅烷含量的增加,硅橡胶的溶胀程度提高改性环氧树脂胶粘刺能浸入硅橡胶的表层,对硅橡胶具有良好的亲和力。用该胶粘剂对硅橡胶与金属或复合材料进行粘接时,取得了良好的粘接效果。 相似文献
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In order to improve the dispersion of graphene in epoxy resin, the preparation of melamine modified graphene oxide (M-rGO) is reported. The π-π interaction between melamine and graphene oxide (GO) sheet is confirmed via ultraviolet–visible spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy analysis, which endows M-rGO with well dispersion. The dispersion concentration of M-rGO in dimethyl sulfoxide is up to 9 mg/ml, and the stability of which keeps more than 18 months. The anticorrosion performance of M-rGO/epoxy composite coatings was analyzed through electrochemical measurements and salt spray tests, these results indicate that M-rGO has a good barrier effect on corrosive medium and even can replace zinc powder in zinc-rich epoxy. In addition, the reinforced mechanical strength of M-rGO/epoxy composite coatings is proved via mechanical strength tests. 相似文献
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以甲基乙烯基硅橡胶生胶为基胶,添加含氢硅油、铂金催化剂等,采用压延工艺制得1~3 mm厚硅橡胶片材;以硅烷偶联剂改性石墨烯并与胶粘剂混合制得涂料,喷涂在硅橡胶片材表面,制得硅橡胶-石墨烯层结构绝缘电磁屏蔽材料。该材料初始电磁屏蔽效能可达82 d Bm,拉伸强度6.5 MPa,电气强度25.3 k V/mm,经紫外光及热老化后,电磁屏蔽效能、力学性能及绝缘性能虽有不同幅度的下降,但仍能满足10 k V带电作业机器人外绝缘及电磁屏蔽应用需求。 相似文献
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采用离子液体改性球磨膨胀石墨(Milled IL-EG)作为填料,成功制备离子液体改性膨胀石墨/硅橡胶(SR)复合材料。通过X射线衍射仪(XRD),扫描电子显微镜(SEM)和透射电子显微镜(TEM)等表征方法研究离子液体(1-丁基-3-甲基咪唑六氟磷酸,[BMIM]PF6)改性球磨膨胀石墨对复合材料电学和热学性能的影响。结果表明膨胀石墨(EG)经离子液体改性后,成功被机械剥离成单层结构的石墨烯,石墨烯表面能够吸附离子液体。改性的石墨烯能均匀分散在硅橡胶复合材料中,更易形成导电网络,复合材料的导电性能显著提高。 相似文献
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Jiaoxia Zhang Weirui Zhang Liping Wei Liuyue Pu Jianping Liu Hu Liu Yingchun Li Jincheng Fan Tao Ding Zhanhu Guo 《大分子材料与工程》2019,304(12)
Epoxy composite coatings filled with fillers have been used extensively as anticorrosion materials. In this study, an alternating multilayer structure is designed to obtain multifunctional epoxy resin composite coating based on stepwise coating method via adding graphene and α‐alumina. Their mechanical properties, thermal conductivity, dielectric and anticorrosion properties are characterized. The toughness and the thermal conductivity clearly increase, while the dielectric properties decrease approximately to zero when the filler mass fraction increases from 0.00% to 0.15%. The whole corrosion process is controlled by electrochemical reaction, and the fillers effectively block the corrosive medium, thus improving the anticorrosion performance of the composite coating. 相似文献
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The surface modification of BaTiO3 and its effects on the microstructure and electrical properties of BaTiO3/silicone rubber composites 下载免费PDF全文
Interfacial interaction and compatibility between the ceramic dielectric and polymer matrix have strong impact on the dielectric constant and dielectric loss of their composites. In this work, the BaTiO3 (BT) nanoparticles were modified by (1) stearic acid (SA); (2) aluminate coupling agent (ACA); (3) the combination of SA and coupling agent aluminate, and then incorporated them with silicone rubber (SR) matrix to prepare BT/SR nanocomposites. The effects of the surface modification methods of BT on the microstructure and electrical properties of BT/SR nanocomposite films were studied. The results showed that SA and ACA were beneficial to the dispersion of BT and resulted in the strong interfacial interaction. The composite of BT modified by SA not only had high dielectric constant of 10.5, 2 times higher than that of the unmodified BT/SR nanocomposite (4.7), at the same time showed lower dielectric loss. J. VINYL ADDIT. TECHNOL., 24:288–294, 2018. © 2017 Society of Plastics Engineers 相似文献