期刊
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
卷 78, 期 -, 页码 74-82出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2017.06.006
关键词
Silica nanoparticles; epoxy nanocomposites; advanced materials; epoxy resins
资金
- Kasetsart University Research and Development Institute (KURDI)
- Institutional Research Grant from Thailand Research Fund [IRG5980004]
- Center for Polymer Science and Engineering at Lehigh University
- Faculty of Engineering at Kasetsart University
An investigation of the thermo-mechanical behavior of silica nanoparticle reinforcement in two epoxy systems consisting of diglycidyl ether of bisphenol F (DGEBF) and cycloaliphatic epoxy resins was conducted. Silica nanoparticles with an average particle size of 20 rim were used. The mechanical and thermal properties, including coefficient of thermal expansion (CTE), modulus (E), thermal stability, fracture toughness (KO, and moisture absorption, were measured and compared against theoretical models. It was revealed that the thermal properties of the epoxy resins improved with silica nanoparticles, indicative of a lower CTE due to the much lower CTE of the fillers, and furthermore, DGEBF achieved even lower CTE than the cycloaliphatic system at the same wt.% filler content. Equally as important, the moduli of the epoxy systems were increased by the addition of the fillers due to the large surface contact created by the silica nanoparticles and the much higher modulus of the filler than the bulk polymer. In general, the measured values of CTE and modulus were in good agreement with the theoretical model predictions. With the Kerner and Halpin-Tsai models, however, a slight deviation was observed at high wt.% of fillers. The addition of silica nanoparticles resulted in an undesirable reduction of glass transition temperature (T-g) of approximately 20 degrees C for the DGEBF system, however, the T-g was found to increase and improve for the cycloaliphatic system with silica nanoparticles by approximately 16 degrees C. Furthermore, the thermal stability improved with addition of silica nanoparticles where the decomposition temperature (T-d) increased by 10 degrees C for the DGEBF system and the char yield significantly improved at 600 degrees C. The moisture absorption was also reduced for both DGEBF and cycloaliphatic epoxies with filler content. Lastly, the highest fracture toughness was achieved with approximately 20 wt.% and 15 wt.% of silica nanoparticles in DGEBF and cycloaliphatic epoxy resins, respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据