Abstract
AbstractThe dielectric properties of vinylidene chloride—vinyl chloride copolymers prepared at conversions of less than 5% were studied. The magnitude of dielectric α absorption (absorption at high temperature) is not a linear function of the composition on account of the effect of the copolymer's crystallinity. On the other hand, a nearly linear relationship was observed between the dielectric glass transition temperature (Tg) of low‐conversion polymer and its composition, while the relationship in a high‐conversion copolymer system, observed by Boyer and Narita et al., is sigmoid. The differences in the temperature—composition relationship between low‐conversion and high‐conversion copolymer systems are illustrated in terms of the distribution of molecular composition. The dielectric β absorption observed in the copolymer whose vinyl chloride molar fraction is more than 0.5 was interpreted as the local motion of vinyl chloride sequences, and the vinyl chloride sequence of 2 or 3 units is sufficient to participate in the β absorption of the copolymer.
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