Dielectric studies of the methacrylate series. II. Poly‐n‐butyl methacrylate

Abstract

AbstractThe complex dielectric constant of a pure molecular weight fraction of poly‐n‐butyl methacrylate was determined over a frequency range of 30 to 3 × 105 cps. and a temperature range of −74 to 114°C. The d.c. volume resistivity–temperature behavior was also determined. The data indicate the presence of two transition regions. Comparison of these data with those on polyethyl methacrylate shows that the transitions in the butyl polymer are further apart in temperature than in the ethyl polymer. Further, the data show that the ethyl chain is stiffer than the butyl chain. An attempt at superposition of the normalized complex dielectric constant was unsuccessful. Calculation of the distribution function of relaxation times for several temperatures shows a marked temperature dependence of this function.