Diffusional behavior of multi-arm star polymers by H pulsed field gradient spin-echo NMR method |
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| Authors: | Taiichi Furukawa Koji Ishizu Isao Ando |
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| Affiliation: | a Department of Organic Materials and Macromolecules, International Research Center of Polymer Science, Tokyo Institute of Technology, 2-12-1-H133, Ookayama, Meguro-ku Tokyo 152-8552, Japan
b Department of Chemistry and Materials, Tokyo Institute of Technology, International Research Center of Macromolecular Science, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552, Japan |
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| Abstract: | The diffusional behavior of multi-arm star-shaped p(tBMA) was investigated in a concentration range from dilute to semidilute region with 1H pulsed field gradient spin-echo NMR (PFGSE-NMR). An 142-arm star-shaped p(tBMA) showed two diffusional mode, which reflected the coexistence of liquid ordering phase and liquid phase near the ordering transition. On the other hand, for star-shaped p(tBMA) with 55 arms showed a single diffusional relaxation in all concentration ranges during observation time. In the semidilute region, the relationship between the diffusion coefficient against the polymer concentration was affected strongly not only the arm number but also liquid ordering structure. |
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| Keywords: | Soft sphere Diffusional behavior Ordering |
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