Hi,
I'm searching for a high positive dielectric anisotropy polymer, consisting of both rigid and flexible sections.
For clarity, this means a high dielectric constant in the direction of the polymer's backbone, the opposite of, for example, polyvinylidene difluoride (PVDF).
My best guess would be a main-chain liquid crystal polymer with high dielectric anisotropy liquid crystal monomers, or some polyphenylene vinylene block co-polymer, but I'm searching for a specific polymer and not a general group of polymers.
I have limited synthesis possibilities, so comercially available polymers, or polymers synthesised from polymerisations from readily available monomers, are preferred.
I'm thankful for all suggestions!
One example of a commercially available polymer with high positive dielectric anisotropy that contains both rigid and flexible sections is poly(4-vinylphenol-co-4-hydroxystyrene) (PVPHS). This copolymer consists of rigid 4-vinylphenol (4-VP) and flexible 4-hydroxystyrene (4-HS) monomers, and has a high dielectric constant in the direction of the polymer backbone due to the presence of the polar 4-VP units.
PVPHS is a thermoplastic polymer that can be easily synthesized by free radical copolymerization of 4-VP and 4-HS monomers. The ratio of 4-VP to 4-HS can be adjusted to tune the dielectric anisotropy and other properties of the copolymer.
Another example of a polymer with high positive dielectric anisotropy is poly(ethylene oxide-co-propylene oxide-co-ethylene oxide) (PEO-PPO-PEO), also known as Pluronics. Pluronics are triblock copolymers consisting of rigid poly(propylene oxide) (PPO) blocks and flexible poly(ethylene oxide) (PEO) blocks, and have a high dielectric constant in the direction of the PPO block due to its polar nature.
Pluronics are commercially available and can be easily synthesized by polymerization of ethylene oxide and propylene oxide monomers. The ratio of PEO to PPO can be adjusted to tune the dielectric anisotropy and other properties of the copolymer.
Both PVPHS and Pluronics are widely used in various applications such as electronics, optics, and biomedical engineering due to their unique properties.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Inorganic Materials
- Metals
- Alloys
- Steel