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タイトル: | Topological Mechanism of Nucleation of Cyclic Polyethylene(Knots and soft-matter physics: Topology of polymers and related topics in physics, mathematics and biology) |
著者: | Yamazaki, Shinichi Ida, Shouichi Kimura, Kunio |
著者名の別形: | 山崎, 慎一 |
発行日: | 20-Apr-2009 |
出版者: | 物性研究刊行会 |
誌名: | 物性研究 |
巻: | 92 |
号: | 1 |
開始ページ: | 47 |
終了ページ: | 50 |
抄録: | In order to clarify the effects of entanglement species on nucleation of polymers, we studied the nucleation rate I of cyclic and linear polyethylenes (C-PE and L-PE) from the melt as a function of degree of supercooling ΔT by means of polarizing optical microscope. We prepared several C-PEs with different weight average molecular weights M_w=4600-114800. I of all the sample were obeyed the equation, I=I_0exp(-C/ΔT^2). I_0s of C-PE with M_w=114800 and L-PE with M_w=35400 were almost the same. This indicates that C-PE is easier to nucleate than L-PE due to lack of knot entanglements. On the other hand, Cs for C-PE significantly increased with increasing M_w. This tendency is quite different with L-PE previously reported. The increase of C indicates that folding regularity of end surface of nucleus increases. Since topological constraint of C-PE arose from the lack of chain ends is relatively decreased with increasing M_w, it was implied that the nucleation behavior of C-PE approaches that of L-PE. |
記述: | この論文は国立情報学研究所の電子図書館事業により電子化されました。 |
URI: | http://hdl.handle.net/2433/169121 |
出現コレクション: | Vol.92 No.1 |
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