Dielectric studies on the heterogeneity and interfacial property of composites made of polyacene quinone radical polymers and sulfonated polyurethanes.
Sulfonated polyurethane (PUI, matrix) is synthesized and composited with polyacene quinone radical polymers (PAQRs, filler). The polarization mechanism of these polymers and composites were investigated in terms of their frequency, temperature, and filler-concentration-dependent dielectric properties. We found that PUI/PAQR composites have a high permittivity, which is attributed to the filler-matrix interfacial polarization and the contact effect. The PAQR-concentration-dependent permittivity of different PUI/PAQR composites reveals a percolation threshold at 20-30 wt % with scaling exponents that indicate the intercluster polarization. The frequency dependence of dielectric response is well-fitted by using the Debye and Cole-Cole functions on the basis of the structural diagrams and equivalent circuit, leading to a detailed evaluation on heterogeneous structures of different PUI/PAQR composites.
Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Material Science, Nanjing Normal University, Nanjing, People's Republic of China. zhudan1013@gmail.com
Dan
D
Zhu
Juan
J
Zhang
Yuezhen
Y
Bin
Chunye
C
Xu
Jian
J
Shen
Masaru
M
Matsuo
D016227:Benzoquinones / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D015394:Molecular Structure; D011140:Polyurethanes / Q000138:chemical synthesis* / Q000737:chemistry; D013451:Sulfonic Acids / Q000138:chemical synthesis* / Q000737:chemistry
D016227:Benzoquinones; D011140:Polyurethanes; D013451:Sulfonic Acids; C004532:quinone