Crystallization Behavior of Poly(ethylene terephthalate-co-ethylene isophthalate)

Crystallization behavior of poly(ethylene terephthalate-co-ethylene isophthalate)(PEIT) with different isoph-thalate contents (4%, 8% and 12%, designated asPEIT4,PEIT8 and PEIT12 respectively) has been inves-tigated by DSC and density measurement methods. Theresults show that the crystailinity of PEIT decreases withincreasing isophthalate content. However the crystallinity of PEIT8 is much smaller than that of PEIT12 whencooling from melt at a constant rate.The crystailinity ofPEIT8 cold-drawn filament shows almost the same val-

共聚酯的非等温结晶动力学研究

应用差示扫描量热法（ＤＳＣ），研究了含有间苯二甲酸乙二酯（ＥＩ）共聚酯（ＰＥＩＴ）的非等温结晶动力学，得到了不同间苯含量（Ａ１〈Ａ２〈Ａ３）共聚酯的结晶速率常数Ｋ（Ｔ）表达式及Ａｖｒａｍｉ指数ｎ。结果表明：共聚酯的结晶速率，随着间苯含量的增加而减慢，ＰＥＩＴ－Ａ１，ＰＥＩＴ－Ａ２的Ａｒａｍｉ指数ｎ值，与ＰＥＴ接近，ＰＥＩＴ－Ａ３的ｎ值，大于ＰＥＴ。用＾１Ｈｎ．ｍ。