Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.polymer.2008.11.039
Title: Rheological investigations of linear and hyperbranched polyethersulfone towards their as-spun phase inversion membranes' differences
Authors: Yang, Q. 
Chung, T.-S. 
Weber, M.
Wollny, K.
Keywords: Polyethersulfone
Polymer processing
Polymer rheology
Issue Date: 16-Jan-2009
Source: Yang, Q.,Chung, T.-S.,Weber, M.,Wollny, K. (2009-01-16). Rheological investigations of linear and hyperbranched polyethersulfone towards their as-spun phase inversion membranes' differences. Polymer 50 (2) : 524-533. ScholarBank@NUS Repository. https://doi.org/10.1016/j.polymer.2008.11.039
Abstract: We have investigated the macromolecular structure and rheological behavior of both linear and hyperbranched polyethersulfone (PES) materials. It was found that the hyperbranched PES material has a higher molecular weight and a wider molecular weight distribution than its linear analogue. Rheological studies disclose that polymer solutions made from the HPES/polyvinylpyrrolidone (PVP)/N-methyl-2-pyrrolidone (NMP) ternary system have a longer relaxation time than their linear counterparts. The less relaxation characteristics of the HPES dope not only result in a more pronounced die swelling during hollow fiber spinning, but also produce hollow fiber membranes with smaller pore sizes, narrower pore size distribution, and a smaller molecular weight cut-off (MWCO). In addition, elongational viscosity characterizations indicate that HPES possesses a more strain hardening effect than LPES. As a result, films made from the former tends to break easier and quicker under high extensional strains than those made from the latter. © 2008 Elsevier Ltd. All rights reserved.
Source Title: Polymer
URI: http://scholarbank.nus.edu.sg/handle/10635/64525
ISSN: 00323861
DOI: 10.1016/j.polymer.2008.11.039
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