Abstract
Poly(trimethylene terephthalate)(PTMT), which is expected to be used as a new polyester fiber, was polymerized from terephthalic acid and 1,3-propanediol and its basic thermal roperties such as glass transition temperature(Tg), melting temperature(Tm) and non-isothermal crystallization behaviors were investigated by differential scanning calorimetry(DSC). Tg of PTMT was 39.5 ℃, which is much lower than that of PET. The equilibrium melting temperature of 244.1 ℃ was obtained from Hoffman-Weeks plots. Multiple melting curves were observed both in isothermally and non-isothermally crystallized samples. In non-isothermal crystallization, the Aramid exponent of about 2.7 and the activation energy of 165 kl/mol were obtained by using 03awa's modified Aramid equation.