Melt rheology of tadpole-shaped polystyrenes with different ring sizes

Yuya Doi, Atsushi Takano, Yoshiaki Takahashi, Yushu Matsushita

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)


In this study, linear melt rheology of a single-tail tadpole-shaped polystyrene, ST-30/80, having ring and linear sizes of MR ∼ 30 kg mol-1 and ML ∼ 80 kg mol-1, respectively, was examined, and the effect of the ring size on rheological properties of tadpole polymers was discussed by comparing with the data of the previously reported tadpole samples having MR ∼ 60 kg mol-1. ST-30/80 exhibits an entanglement plateau and shows a clearly slower terminal relaxation than that of its component ring and linear polymers. When the zero-shear viscosity η0 for ST-30/80 is plotted against the molecular weight of a linear tail chain, the data point lies on the single curve of η0 for 4-and 6-arm star polymers and the single-tail tadpoles with MR ∼ 60 kg mol-1. These results suggest that the tadpole molecule in this study spontaneously forms a characteristic entanglement network, i.e., the intermolecular ring-linear threading, in the same manner as the previous tadpole samples, even though the size of the ring part is just slightly larger than the entanglement molecular weight (i.e., MR ∼ 1.8Me). This journal is

ジャーナルSoft Matter
出版ステータス出版済み - 10月 7 2020

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 凝縮系物理学


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