Abstract
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 2max increased with increasing M n,bb at almost constant M n,br and \( \overline{p} \), and with increasing \( \overline{p} \) 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 \( \overline{p} \) 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.
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Acknowledgments
We thank S. Murao and S. Nakamoto of Sumitomo Chemical for their assistance in polymer synthesis. Part of this work was performed during the research stay of K.O. at TU Berlin.
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Manfred H. Wagner is the chair of Polymer Engineering/Polymer Physics, Berlin Institute of Technology (TU Berlin).
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Ogura, K., Morioka, K., Tsujii, Y. et al. Uniaxial extensional flow behavior of comb-shaped poly(methyl methacrylate). Rheol Acta 54, 637–645 (2015). https://doi.org/10.1007/s00397-015-0848-9
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DOI: https://doi.org/10.1007/s00397-015-0848-9