Rheological characterization of random poly(butylene isophthalate/terephthalate) copolymers

被引：7
|
作者：
Bandiera, M
Munari, A
Pezzin, G
机构：
[1] UNIV BOLOGNA,DIPARTIMENTO CHIM APPLICATA & SCI MAT,I-40136 BOLOGNA,ITALY
[2] UNIV PADUA,DIPARTIMENTO CHIM FIS,I-35131 PADUA,ITALY
[3] CNR,CTR STUDIO FIS MACROMOL,I-40126 BOLOGNA,ITALY
来源：
EUROPEAN POLYMER JOURNAL | 1997年 / 33卷 / 04期
关键词：
D O I：
10.1016/S0014-3057(96)00163-2
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Random poly(butylene isophthalate/terephthalate) (PBI/PBT) copolyesters of various composition and molecular weight were synthesized and characterized in terms of dilute solution viscosity, molecular weight and thermal properties. From the results of measurements carried out with a capillary rheometer at different temperatures (in the range 200-240 degrees C) on molten samples, the flow curves eta-gamma were obtained; these curves permitted to extrapolate the Newtonian viscosity eta(0), which was correlated with molecular weight. At a fixed temperature, samples with the same weight-average molecular weight and different composition showed a Newtonian viscosity increasing as the content of PET comonomeric units is increased. Furthermore, the activation energy for melt flow, calculated using an Arrhenius-type equation, was found to be slightly affected by composition only. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码：497 / 500
页数：4
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