LINEAR AND BRANCHED POLY(BUTYLENEISOPHTHALATE) - ACTIVATION-ENERGY FOR MELT FLOW

被引：13
|
作者：
MUNARI, A
PEZZIN, G
PILATI, F
机构：
[1] UNIV PADUA,DIPARTMENTO CHIM FIS,I-35100 PADUA,ITALY
[2] CNR,CTR FIS MACROMOLEC,I-40126 BOLOGNA,ITALY
[3] UNIV BOLOGNA,DIPARTIMENTO CHIM APPL & SCI MAT,I-40126 BOLOGNA,ITALY
来源：
RHEOLOGICA ACTA | 1990年 / 29卷 / 05期
关键词：
branched polyester; flow activation energy; Poly(butyleneisophthalate); shear viscosity; temperature shift factor;
D O I：
10.1007/BF01376798
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Several poly(butyleneisophthalate)s of different molecular weight, both linear and randomly branched, were synthetized by bulk polymerization and studied in the molten state with a capillary rheometer in the temperature range 190-220°C. The viscosity shift factors showed to be well correlated to temperature by an Arrhenius-type equation. The melt-flow activation energy at constant shear stress Eτ was found to be 15±1 kcal/mol for both linear and branched samples, whereas for polydisperse poly(butyleneterephthalate) and poly(ethyleneterephthalate) it was found previously that random long-chain branching substantially increases the activation energy. An analysis of our results and of those available in the literature shows that the influence of branches on the temperature coefficient of viscosity of polymers is still a subject open to discussion. © 1990 Steinkopff.
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页码：469 / 474
页数：6
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