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Studing Some Dielectric Properties and Effective Parameters of Composite Materials Containing of Novolak Resin | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 25, Issue 8, 2007, Pages 277-288 PDF (271.67 K) | ||
| DOI: 10.30684/etj.25.8.2 | ||
| Author | ||
| رولا عبد الخضر عباس | ||
| Abstract | ||
| Dielectric constant (εr ) and dielectric strength (Ebr) of composite materials that consist of Novolak reinforced with glass fiber, Novolak reinforced with asbestos fiber and Novolak reinforced with (60%) ratio of glass fiber and asbestos have been Studied. The specimens were made in different ratios of Hexamethylenetetramine (HMTA) content of (10%) and (14%), Then a study was made on influence of (HMTA) on dielectric constant (εr ) and dielectric strength ( Ebr) of these speciments. It was found that permittivity (εr ) and dielectric strength (Ebr) for composite materials are dependent matrix the types and properties of reinforcing materials. Then relation between dielectric constant (ε r) and frequency and temperature and percentage moisture absorption was studied. It was found that dielectric constant increases when the temperature and percentage moisture absorption increase, whereas dielectric constant (ε r) is dependent on capacity of composite materials. | ||
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