caa a22 4500 605466432 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00397-015-0848-9 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0848-9 Uniaxial extensional flow behavior of comb-shaped poly(methyl methacrylate) [Elektronische Daten] [Koji Ogura, Kohei Morioka, Yoshinobu Tsujii, Shu-Yao Hsu, Manfred Wagner] Comb-shaped poly(methyl methacrylate)s (PMMAs) with various mass fractions and various molecular weights of the side chains were prepared by free-radical polymerization followed by atom transfer radical polymerization (ATRP). The rheological properties were characterized in linear-viscoelasticity and in uniaxial extensional flow. Due to branching and thereby slow relaxation of the backbone, significant strain hardening was observed and well analyzed by the molecular stress function (MSF) model. The model parameter f max 2 increased with increasing M n,bb at almost constant M n,br and p ¯ $$ \overline{p} $$ , and with increasing p ¯ $$ \overline{p} $$ at almost constant Φ n,br, where M n,bb and M n,br are the number-average molecular weights of the backbone and the branched chains, and p ¯ $$ \overline{p} $$ and Φ n,br are the average number per backbone and the number-average mass fraction of the branched chains, respectively. These results provide guidelines for the polymer design with the aim of enhancing strain hardening in elongational flow. Springer-Verlag Berlin Heidelberg, 2015 Long-chain branched PMMA nationallicence Rheology nationallicence MSF model nationallicence Uniaxial extension nationallicence Strain hardening nationallicence Poly(methyl methacrylate) nationallicence Ogura Koji Basic Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., 5-1, Sobiraki-cho, 792-8521, Niihama City, Ehime, Japan aut Morioka Kohei Basic Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., 5-1, Sobiraki-cho, 792-8521, Niihama City, Ehime, Japan aut Tsujii Yoshinobu Institute for Chemical Research, Kyoto University, 611-0011, Uji, Kyoto, Japan aut Hsu Shu-Yao Institute for Chemical Research, Kyoto University, 611-0011, Uji, Kyoto, Japan aut Wagner Manfred Polymer Engineering/Polymer Physics, Berlin Institute of Technology (TU Berlin), Fasanenstrasse 90, 10623, Berlin, Germany aut Rheologica Acta Springer Berlin Heidelberg 54/7(2015-07-01), 637-645 0035-4511 54:7<637 2015 54 397 https://doi.org/10.1007/s00397-015-0848-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0848-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ogura Koji Basic Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., 5-1, Sobiraki-cho, 792-8521, Niihama City, Ehime, Japan aut NATIONALLICENCE 700 1- Morioka Kohei Basic Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., 5-1, Sobiraki-cho, 792-8521, Niihama City, Ehime, Japan aut NATIONALLICENCE 700 1- Tsujii Yoshinobu Institute for Chemical Research, Kyoto University, 611-0011, Uji, Kyoto, Japan aut NATIONALLICENCE 700 1- Hsu Shu-Yao Institute for Chemical Research, Kyoto University, 611-0011, Uji, Kyoto, Japan aut NATIONALLICENCE 700 1- Wagner Manfred Polymer Engineering/Polymer Physics, Berlin Institute of Technology (TU Berlin), Fasanenstrasse 90, 10623, Berlin, Germany aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/7(2015-07-01), 637-645 0035-4511 54:7<637 2015 54 397