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- Yamamoto Kazuhiko
- Tokyo Research Laboratory, Japan Synthetic Rubber Co., Ltd.
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- Bessho Nobuo
- Tokyo Research Laboratory, Japan Synthetic Rubber Co., Ltd.
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- Shiibashi Toru
- Tokyo Research Laboratory, Japan Synthetic Rubber Co., Ltd.
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- Maekawa Etsuji
- Tokyo Research Laboratory, Japan Synthetic Rubber Co., Ltd.
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説明
Light scattering and viscosity measurements on dilute solutions of cyclized cis-1,4-polybutadiene polymers (CBR) with different degrees of cyclization (DC) and their fractions are reported in this paper. The data were obtained in both cyclohexane and mixed theta solvents at 30.0°C. The curves of the intrinsic viscosity [η]0 in mixed theta solvents vs. the weight average molecular weight Mw for CBR with DC over 30% exhibited two distinct regions with slopes of 0.5 and less. Thus, the exponent in the viscosity equation is the same as that for the original uncyclized samples at Mw below the critical point Mwc and decrease with increasing DC at Mw above Mwc. The Mwc shifts to lower Mw as DC is increased. The relation of the molecular structure of CBR with DC is discussed. The results led to the conclusions that 1) at DC below 25%, the molecules are linear in the overall structure, but locally contain short intramolecular cyclic structures, e.g., mono- and/or bicyclic structures, 2) at DC between 25 and 60%, the molecules are randomly branched, and 3) at DC over 80%, the molecules have probably very compact structure formed by internal crosslinks.
収録刊行物
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- Polymer Journal
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Polymer Journal 13 (6), 555-561, 1981
The Society of Polymer Science, Japan
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390282681265825536
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- NII論文ID
- 130004428333
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- COI
- 1:CAS:528:DyaL3MXltlemsLg%3D
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- ISSN
- 13490540
- 00323896
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
