caa a22 4500 465813852 CHVBK 20180323112122.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF01331801 doi (NATIONALLICENCE)springer-10.1007/BF01331801 An experimental study of exit pressures for polymer melts [Elektronische Daten] [T. Chan, B. Pan, H. Yuan] A slit die apparatus is used to measure exit pressures for five different polymer melts. Viscosity data obtained from the same apparatus agree well with values obtained from a cone-and-plate rheometer or a capillary rheometer. Except for a PVC sample where thermal degradation was found to occur, the exit pressures obtained by linear extrapolation of the measured pressure profiles are all positive, and increase with increasing shear stress. The values of the first normal stress difference calculated according to the exit pressure theory are of the right order of magnitude and in some cases correlate satisfactorily with values measured in a cone-and-plate rheometer. However, the high sensitivity of the exit pressure values to the method of extrapolation and the wild scatter of exit pressure data for some materials make it difficult to use the exit pressure method as a routine procedure for accurate determination of the first normal stress difference. Steinkopff, 1990 E xit p ressure nationallicence f irst normal s tress difference nationallicence v iscosity nationallicence p olymer m elts nationallicence s lit d ie nationallicence Chan T. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut Pan B. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut Yuan H. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut Rheologica Acta Steinkopff-Verlag 29/1(1990-01-01), 60-70 0035-4511 29:1<60 1990 29 397 https://doi.org/10.1007/BF01331801 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01331801 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chan T. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut NATIONALLICENCE 700 1- Pan B. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut NATIONALLICENCE 700 1- Yuan H. Polymer Science Department, Beijing Institute of Chemical Technology, 100013, Beijing, China aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/1(1990-01-01), 60-70 0035-4511 29:1<60 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer