Abstract
The melting behavior and the crystallization kinetics of poly(butylene/diethylene naphthalate) and poly(butylene/thiodiethylene naphthalate) random copolymers were investigated by means of DSC. By the Hoffman–Weeks’ method, the Tm° of α and β′-PBN phases were derived: the Tm° value of β′-form was higher, as expected, taking into account that it is thermodynamically favorite and more tightly packed. The presence of oxygen or sulphur atoms in PBN reduced its ability of crystallizing, the crystallization rate regularly decreasing with the co-unit content. α-PBN phase crystallized faster than β′-one, being the more kinetically favorite.
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