摘要
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。
The non- isothermal crystallization kinetics of poly(ethylene terephthalate/isophthalate) (PEIT) with different isophthalate content ( A1 < A2 < A3) is studied by differential scanning calorimetry (DSC). Avrami exponent n and the expressions of crystallization rate parameter K( T) of PEIT have been obtained . The results show that K decreases with increasing isophthalate content. It is also found that n values of PEIT - At and PEIT - A2 are more or less the same to that of PET. The value of n of PEIT - A3 is larger than that of PET. The molecular chain sequence distribution of PEIT is also investigated by 1Hn.m.r method. It reveals PEIT - AI and PEIT - A2 are block - copolymer with isophthalate sequence length > 5 . PEIT - A3 is a random copolymer in which most isophthalate sequence length is 2. The relationship between the value of Avrami expoent n of PEIT and sequence distribution characteristic has been discussed.
出处
《中国纺织大学学报》
CSCD
1999年第4期1-7,共7页
Journal of China Textile University
