Dielectric Properties and Side‐Chain Crystallinity of Polyvinyl Stearate

摘要: Measurements of the real (e′) and imaginary (e″) parts dielectric constant have been made on polyvinyl stearate at temperatures from −50° to +80°C over a frequency range 100 50 000 cps. Although no full relaxation dispersion region has found in this range, there are indications beginnings high‐frequency just above freezing point (49.1°C) liquid polymer. This cuts off or is ``frozen in'' rapidly as sample freezes, giving evidence slight rotational freedom solid polymer near melting points. Because ``freezing mechanism it supposed that dipolar side chain unable rotate form because combined effects side‐chain crystalline field angle which C–O bond (between main polymer) makes with axis. Specific volume measurements were supplement work. The measureme...