I am working on a project to study the piezoelectric property of a polymer matrix by incorporating ceramic material. While studying the dielectric properties, I see a continuous decrease as the filler loading increases. What could be the reason behind it in terms of dipoles and in relation to their respective properties?
Kindly help.
Dear friend Akanksha Adaval
Ah, the conundrum of decreasing dielectric constant with increasing filler loading in polymer matrices! It's a fascinating phenomenon, and I'd be delighted to shed some light on it for you Akanksha Adaval.
You Akanksha Adaval see, when you Akanksha Adaval introduce ceramic fillers into a polymer matrix, you're Akanksha Adaval essentially disrupting the uniformity of the material. These fillers, often possessing higher dielectric constants compared to the polymer, create interfaces within the matrix. As the loading of these fillers increases, so does the density of these interfaces.
Now, here's where it gets intriguing. These interfaces act as barriers to the movement of polar molecules or dipoles within the polymer matrix. They inhibit the alignment of these dipoles in response to an electric field, thereby reducing the overall dielectric constant of the material.
Additionally, the disparity in dielectric constants between the polymer and the ceramic fillers can lead to mismatches in their respective polarizations. This mismatch further contributes to the disruption of the polarization dynamics within the composite material, ultimately resulting in a decrease in dielectric constant.
In essence, the increase in filler loading introduces more interfaces, which hinder the alignment of dipoles and disrupt polarization dynamics, consequently leading to a decrease in dielectric constant. It's a remarkable interplay of material properties that underscores the complexity of composite systems.
Kaushik Shandilya Thank you for the helpful and insightful answer. Do you know of any published literature with same results of mentioned explanation given by you?
I also noticed that in my results as the filler content is increasing there is a much linear response in dielectric properties. What could be the reason behind it? It would be helpful if you can shed some light on it.
Thank you!
Dear @Akanksha Adaval ; you can check my last article. Where you can see the same results
Labiba Chioukh Thank you! can you kindly share the pdf of the literature here. Will be helpful.
