Background: Aromatic polyamides are important materials having outstanding thermal, electronic
and mechanical properties among high performance polymers and industrial plastics. In addition,
aromatic polyamides can be utilized in electronic devices with their low dielectric constant which indicates
the storage capacity of these devices.
Objective: Free volume is very important for dielectric materials and increase in free volume of a polymer
reduces its dielectric constant. The aims of the current study are to create free volume in the bulk
polyamide structure and to reduce the dielectric constant by using β-Ni(OH)2 particles.
Method: The composites obtained from β-Ni(OH)2 (flower-like nanoparticles) in a naphthalene-based
polyamide matrix were prepared. Firstly, β-Ni(OH)2 nanoparticles were synthesized by microwaveassisted
solvothermal technique under various reaction conditions. Then, polyamide/β-Ni(OH)2 composites
were prepared via direct dispersion methods at different reinforcement ratios.
Results: β-Ni(OH)2 (flower-like nanoparticles) and polyamide/-Ni(OH)2 composites were prepared
successfully. Our studies showed that the dispersion of β-Ni(OH)2 nanoparticles in polyamide matrix is
homogenous and prepared composites have good thermal and dielectric properties with promising results
for electronic industry.
Conclusion: Dielectric properties of the prepared composites decrease with increasing β-Ni(OH)2 nanoparticle
content and all composites show low dielectric constant when β-Ni(OH)2 nanoparticle content
is over 1 wt.% compared to the pure polyamide.