Mechanical, thermal and dielectric properties of modified attapulgite-graphene oxide/epoxy composites
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摘要: 分别用硅烷偶联剂KH560改性凹凸棒土(Attapulgite,ATP)和氧化石墨烯(Graphene oxide,GO),并将其复合制备ATP-GO复合物。以环氧树脂(Epoxy,EP)为基体,采用原位聚合法制备ATP-GO/EP复合材料。采用SEM和FTIR对ATP-GO复合物的形貌和化学结构进行表征。结果表明:ATP与GO成功键合并附着在GO表面;ATP-GO的加入,提高了EP的冲击强度、弯曲强度和热稳定性,降低了其介电常数和介电损耗。3wt%ATP-0.5wt%GO/EP复合材料的弯曲强度和冲击强度分别为138.58 MPa和20.80 kJ/m2,比纯EP分别提高了75.5%和351.6%,而其介电常数和介电损耗分别低至3.36和0.0118,比纯EP降低了7.7%和27.3%。Abstract: The attapulgite (ATP) and graphene oxide (GO) were modified with silane coupling agent KH560, and they were composited to obtain the ATP-GO hybrids. Then the ATP-GO/epoxy resin (EP) composites were prepared by in-situ polymerization using the EP as the matrix. The morphology and chemical structure of the ATP-GO hybrids were characterized by SEM and FTIR. The results show that ATP and GO are successfully composed with ATP attached on the surface of GO. The impact strength, bending strength and thermal stability of the ATP-GO/EP composite are enhanced by incorporation of ATP-GO hybrid fillers, whereas the dielectric constant and the dielectric loss are reduced. The bending strength and impact strength of 3wt%ATP-0.5wt%GO/EP composites reach 138.58 MPa and 20.80 kJ/m2, which are 75.5% and 351.6% higher than that of the pure EP, respectively. While the dielectric constant and dielectric loss of ATP-GO/EP composites decrease to 3.36 and 0.0118, which are 7.7% and 27.3% lower than that of the pure EP.
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Key words:
- epoxy resin /
- attapulgite /
- graphene oxide /
- composites /
- mechanical properties
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表 1 纯EP和ATP-GO/EP复合材料的热重分析数据
Table 1. Thermogravimetric analysis data of pure EP and ATP-GO/EP composites
Sample Temperature for mass loss/℃ THRI*/℃ T600/% Td5 Td30 Neat EP 305 395 178 8.9 1wt%ATP-0.5wt%GO/EP 283 399 173 10.4 3wt%ATP-0.5wt%GO/EP 351 399 186 19.7 5wt%ATP-0.5wt%GO/EP 325 396 180 12.7 7wt%ATP-0.5wt%GO/EP 352 398 186 14.3 Notes:THRI—Heat resistance index, THRI=0.49[Td5+0.6(Td30-Td5)];Td5,Td30—Corresponding to decomposition temperature of 5% and 30% mass loss. -
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