Effect of Water Absorption on the Mechanical and Dielectric Properties of Nano-Alumina Filled Epoxy Nanocomposites

2007 ◽  
Vol 334-335 ◽  
pp. 617-620 ◽  
Author(s):  
Hong Xia Zhao ◽  
Robert Kwok Yiu Li
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Tensile Tests ◽  
Alumina Nanoparticles ◽  
Al2o3 Nanoparticles ◽  
Epoxy Nanocomposites ◽  
Effect Of Water ◽  
The Matrix

Results on the effect of water absorption on the mechanical and dielectric properties of nano-size spherical alumina (Al2O3) filled epoxy are presented in this paper. The results from tensile tests indicate that incorporation of the Al2O3 nanoparticles into the epoxy can improve the stiffness of the matrix. DMA results show that the stiffness improvement is more pronounced at the rubbery region of the matrix. The alumina nanoparticles can increase the dielectric constant of the epoxy resin due to the increase in the total interfacial area. Upon water absorption, the mechanical properties of the alumina/epoxy nanocomposites decrease evidently, because of the damages induced by water on the epoxy resin. However, the ductility of epoxy can be improved by the water absorption process. In addition, the dielectric constant of the alumina/epoxy nanocomposites increased greatly after water absorption treatment.

Dielectric Properties of Al2O3 Nanofibers/Epoxy Resin Nanocomposites

2013 ◽  
Vol 873 ◽  
pp. 486-491 ◽  
Author(s):  
Yu Xia Zhang ◽  
Hong Zhou ◽  
Yong Fan
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Epoxy Resin ◽  
Hydrothermal Process ◽  
Epoxy Nanocomposites ◽  
Dielectric Spectra ◽  
Low Level ◽  
Alumina Nanofibers ◽  
Epoxy Resin Nanocomposites

In this article, Al2O3 nanofibers have been successfully synthesized by hydrothermal process and Al2O3 nanofibers/epoxy nanocomposites were fabricated by incorporating the Al2O3 nanofibers modified by 3-aminopropyl trimethoxysilane (APTMOS). Dielectric spectra of the nanocomposites were investigated. The effects of Al2O3 morphology and concerntration on dielectric spectra of nanocomposites were discussed. The results showed that the dielectric constant increased smoothly as the alumina nanofibers concentration increasing, but it decreased with increasing frequency. While the dielectric loss increased slightly with increasing frequency, however, it still remained at a low level.

scholarly journals Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2451
Author(s):  
Jianwen Zhang ◽  
Dongwei Wang ◽  
Lujia Wang ◽  
Wanwan Zuo ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binding Energy ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Mean Square Displacement ◽  
Mean Square ◽  
Hyperbranched Polyester ◽  
Free Volume Fraction

To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

Thermal and Dielectric Properties of Inorganic-Organic Nanocomposites Involving Epoxy Resin and Polyhedral Oligomeric Silsesquioxanes

2012 ◽  
Vol 476-478 ◽  
pp. 665-669 ◽  
Author(s):  
Li Yang ◽  
Miao Yin ◽  
Xiu Yun Li ◽  
Han Bing Ma
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Functional Groups ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Diglycidyl Ether ◽  
Polyhedral Oligomeric Silsesquioxanes

In this paper, a type of nanoporous polyhedral oligomeric silisesquioxanes (POSS) containing eight functional groups have been synthesized and mixed with diglycidyl ether of bisphenol A (DGEBA) to form epoxy resin networks with nanostructures. The cured octa(aminophenyl) silsesquioxane (1c-POSS) and DGEBA system inherently possesses higher thermal stability and higher char yield than the control epoxy resins. Furthermore, the dielectric constant of the 1c-POSS/DGEBA material (4.36) is substantially lower than that of the neat epoxy resins (4.64) as a consequence the presence of nanoporous POSS cubes in the epoxy matrix.

scholarly journals Effect of Water Absorption on Dielectric Constant of TMD Cured of Carbonaceous Filled Epoxy Composites

2019 ◽  
Vol 30 (Supp.1) ◽  
pp. 101-107
Author(s):  
Muhammad Helmi Abdul Kudus ◽  
◽  
Hazizan Md. Akil ◽  
Muhammad Razlan Zakaria ◽  
Muhammad Bisyrul Hafi Othman ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Water Absorption ◽  
Epoxy Composites ◽  
Effect Of Water

scholarly journals Effect of Interfacial Polarization and Water Absorption on the Dielectric Properties of Epoxy-Nanocomposites

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 195 ◽  
Author(s):  
Philipp Marx ◽  
Andrea Wanner ◽  
Zucong Zhang ◽  
Huifei Jin ◽  
Ioannis-Alexandros Tsekmes ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Water Absorption ◽  
Interfacial Polarization ◽  
Epoxy Nanocomposites
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