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タイトル: | Detection of fast and slow crystallization processes in instantaneously-strained samples of cis-1,4-polyisoprene |
著者: | Tosaka, Masatoshi https://orcid.org/0000-0001-8016-8329 (unconfirmed) Senoo, Kazunobu Sato, Kenta Noda, Miki Ohta, Noboru |
著者名の別形: | 登阪, 雅聡 |
キーワード: | Strain-induced crystallization Stress relaxation Injection molding |
発行日: | Feb-2012 |
出版者: | Elsevier Ltd. |
誌名: | Polymer |
巻: | 53 |
号: | 3 |
開始ページ: | 864 |
終了ページ: | 872 |
抄録: | Cross-linked samples of natural rubber (NR) and synthetic cis-1, 4-polyisoprene (IR) were instantaneously expanded to a predetermined strain ratio, α[s], using a newly-designed high-speed tensile tester. Crystallization behavior after the cessation of deformation was investigated. The high-cycle wide-angle X-ray diffraction (WAXD) measurements could successfully reveal the drastic progress of crystallization within the first a few hundred milliseconds. Quantitative analysis of Cross-linked samples of natural rubber (NR) and synthetic cis-1, 4-polyisoprene (IR) were instantaneously expanded to a predetermined strain ratio, α[s], using a newly-designed high-speed tensile tester. Crystallization behavior after the cessation of deformation was investigated. The high-cycle wide-angle X-ray diffraction (WAXD) measurements could successfully reveal the drastic progress of crystallization within the first a few hundred milliseconds. Quantitative analysis of diffraction intensity clarified coexistence of fast and slow crystallization processes; time constants τ[f] and τ[s], and amplitude I[f] and I[s], respectively, were estimated for these processes. The values of τ[f] were in the range of 50–200 ms, while τ[s] ranged between 2.5 and 4.5 s. Almost linear dependence of [I]f and I[s] on α[s] was clarified. The crystallite size in the directions both parallel and perpendicular to the stretching direction decreased with the increase in time-averaged nominal stress. The crystal lattice deformed almost linearly with the average nominal stress. For the fast process, correlation between crystallization and stress relaxation was not recognized, while linear relationship between them was found for the slow process. In every case, strain-induced crystallization was found to be the major origin of stress relaxation. Based on the results, effects of strain on crystallization of polymer melt were discussed. |
著作権等: | © 2011 Elsevier Ltd. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/153409 |
DOI(出版社版): | 10.1016/j.polymer.2011.12.035 |
出現コレクション: | 学術雑誌掲載論文等 |
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