| 초록 |
We will report on ferroelectric copolymer composed of vinylidene fluoride (VDF) and trifluoroethylene (TrFE). Copolymerization was performed by combination of technologies, such as monomer supplier system, suspension process and control technique. We obtained successively copolymer with whole composition (VDF 35~91.5 mol %) and a similar molecular weight (about 200,000). Main microstructure with pentad unit ( 20202, 20201, 20200, 20212, etc) were observed in copolymer. Copolymer gradually alters molecular conformation from paraelectric phase (trans-guache) to ferroelectric phase (planar zigzag all trans), and Curie temperature of ferroelectric phase transition shifts to higher temperature with increase of VDF content. |
