caa a22 4500 465814298 CHVBK 20180323112123.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF01376798 doi (NATIONALLICENCE)springer-10.1007/BF01376798 Linear and branched poly(butyleneisophthalate): Activation energy for melt flow [Elektronische Daten] [Andrea Munari, G. Pezzin, F. Pilati] 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 stressE τ 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. Steinkopff, 1990 Poly(butyleneisophthalate) nationallicence shear v iscosity nationallicence t emperature s hift factor nationallicence flow a ctivation energy nationallicence branched p olyester nationallicence Munari Andrea Istituto di Chimica Industriale della Facoltà di Ingegneria, dell'Università di Padova, Via Marzolo 9, 35100, Padova, Italy aut Pezzin G. Dipartimento di Chimica Fisica, dell'Università di Padova, Padova, Italy aut Pilati F. Dipartimento di Chimica Applicata e Scienza dei Materiali, dell'Università di Bologna, Bologna, Italy aut Rheologica Acta Steinkopff-Verlag 29/5(1990-09-01), 469-474 0035-4511 29:5<469 1990 29 397 https://doi.org/10.1007/BF01376798 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01376798 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Munari Andrea Istituto di Chimica Industriale della Facoltà di Ingegneria, dell'Università di Padova, Via Marzolo 9, 35100, Padova, Italy aut NATIONALLICENCE 700 1- Pezzin G. Dipartimento di Chimica Fisica, dell'Università di Padova, Padova, Italy aut NATIONALLICENCE 700 1- Pilati F. Dipartimento di Chimica Applicata e Scienza dei Materiali, dell'Università di Bologna, Bologna, Italy aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/5(1990-09-01), 469-474 0035-4511 29:5<469 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 460963813 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer