Relationship between Polymer Dielectric Constant and Percolation Threshold in Conductive Poly(styrene)-Type Polymer and Carbon Black Composites

Table 1

Thermal, mass, and electronic properties of polymers.

Characterization	Property	Polymer
		PS	4MePS	4BrPS	4ClPS
Thermal	/°C	106	115	136	131
	/°C	385	370	387	382
GPC	Mass of the repetitive unit	80	118	182.9	138.5
	g/mol	1.43	2.45	2.55	2.48
	PD	1,788	2,076	1,394	1,791
		2.024	1.506	1.370	1.452
Electric	Pauling electronegativity of the 4-substituent	2.1	2.4	2.8	3.2
	magnitude of dipole moment (D)^a	0.25	0.084	1.45	1.38
	Dielectric constant	2.60	2.43	2.82	2.77
	(17°C, 850 MHz)

Calculated by MOPAC PM3.