Dielectric properties of oligomers: 4. Dielectric properties of vinyl acetate and methyl methacrylate oligomers

Dielectric properties of vinyl acetate and methyl methacrylate oligomers were studied in order to compare the dielectric properties of an oligomer with those of the corresponding high polymers. The two oligomers showed asymmetric dielectric relaxations at room temperatures. The complex dielectric constants vs. angular frequencies for these oligomers were well represented by the Havriliak-Negami equation:

$\text{?}{}^{\mathrm{ast;}}\text{??}{}_{\mathrm{\infty }}\text{=}\text{?}{}_0\text{??}{}_{\mathrm{\infty }}\text{1+(jωτ}{}_0\text{)}{}^{\mathrm{1?\alpha }}\text{]}{}^{\mathrm{\beta }}$

The distribution parameters (1 - α) and β of vinyl acetate and methyl methacrylate oligomer are almost equal to those of poly(vinyl acetate) and poly(methyl methacrylate), respectively. It was concluded that the distribution of relaxation times was independent of the molecular weight of the polymers.