Enhanced Dielectric Response in Polyurethane Based All-Organic Nanocomposite

Abstract:

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A high dielectric constant nano-composite was fabricated using polyurethane (PU) as matrix and poly (p-chloromethyl styrene) (PCMS) grafted with copper phthalocyanine oligomer (CuPc, a planar multiring semiconductor with dielectric constant>105) (name the grafting product as PCMS-g-CuPc) as filler. According to the TEM-observed morphologies, PCMS-g-CuPc balls (~80 nm) distribute uniformly in PU matrix, while in PCMS-g-CuPc balls the PCMS acts as “matrix” which contains dispersed CuPc particles with a average size of ca. 25nm [1/20 of that of CuPc in simple blend of PU and CuPc (PU/CuPc)]. At 100Hz, the dielectric constant of the nanocomposite reaches 345, almost 7 times higher than that of PU/CuPc. The enhanced dielectric response in the nano-composite can be explained by the remarkably strengthened interface exchange coupling effect as well as the Maxwell-Wagner-Sillars polarization mechanism due to the significantly reduced CuPc particle size in the nano-composite.

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Periodical:

Edited by:

Arshad Munir and Zaffar M. Khan

Pages:

73-80

DOI:

10.4028/www.scientific.net/AMR.326.73

Citation:

J. W. Wang et al., "Enhanced Dielectric Response in Polyurethane Based All-Organic Nanocomposite", Advanced Materials Research, Vol. 326, pp. 73-80, 2011

Online since:

September 2011

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$35.00

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