The isothermal crystallization behavior of poly(trimethylene terephthalate)(PTMT), which was obatined from the polymerization of terephthalic acid and 1,3-propanediol, was analyzed by DSC and some physical parameters were calculated. The Avrami exponents for isothermal crystallization were 2.8-3.2 at various crystallization temperatures. The regime transition of PTMT was not found at the range of 180-200 ℃ and the Lauritzen Z-test showed that the isothermal crystallization of PTMT followed regime (Ⅱ) kinetics. The surface free energy of side surface (σ)of PTMT was 10.37 erg/㎠ and that of end surface(σe)was 101.20 erg/㎠, and the work required to form a fold, q, was 33.03 kJ/mol.

1,3-Propanediol과 terephthalic acid의 중합에 의해서 얻어진 poly(trimethylene terephthalate) (PTMT)의 등온 결정화 거동을 DSC를 이용하여 분석하였고, 이에 따른 여러 물리화학적 파라미터들을 구하였다. PTMT의 등온 결정화에 의한 Avrami 지수는 결정호 온도에 따라 2.8-3.2 사이의 값을 나타내었다. 180-210℃에서 결정화시키는 경우 regime transition은 일어나지 않았으며 Lauritzen Z-test 결과 regime 거동은 regime (Ⅱ) kinetics를 따랐다. 결정화시 측면 표면자유에너지 (σ_e) 값은 101.20 erg/㎠이었으며 분자쇄의 굽힘에 필요한 일인 q값은 33.03 kJ/mol이었다.

Keywords: poly(trimethylene terephthalate); isothermal crystallization; regime transition; Lauritzen Z-test; surface free energy