2007 Fiscal Year Final Research Report Summary
Fine Characterization of Semiflexible Star Polymers and Their Phase Behavior
| Project/Area Number |
17350057
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
YOSHIZAKI Takenao Kyoto University, Graduate School of Engineering, Professor (90230705)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Yo Kyoto University, Graduate School of Engineering, Associate Professor (90243162)
OSA Masashi Kyoto University, Graduate School of Engineering, Assistant Professor (50332721)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Smiflexible Polymer / Star Polymer / Poly(n-hexyl isocyanate) / Fine Characterization / Phase Behavior / Mean-Square Radius of Gyration / Steady-State Transport Property / MC Simulation |
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| Research Abstract |
We have made theoretical and experimental studies of conformations and dilute solution behavior of semiflexible star polymers and also of their phase behavior, taking as an example regular three-arm star poly(n-hexyl isocyante) (PHIC). The results obtained are as follows:
(1) Theoretical study of the steady-state transport properties of semiflexible star polymers: The ratio of the intrinsic viscosity of the wormlike regular three-arm star chain to that of the corresponding linear one with the same total chain length has been calculated in the Kirkwood-Riseman approximation. On the basis of the numerical results so obtained, an interpolation formula for the ratio, which is useful for analyses of experimental data, has been constructed (published).
(2) Characterization of a semiflexible polymer by the scattering method: An argon ion laser, which has long been used as a light source of our light scattering photometer has been replaced with an Nd: VYO_4 one. First, the optical alignment of t
… More
he photometer has been tuned to the new light source and the performance of the photometer has been examined by the use of a standard sample. Then, static and dynamic light scattering measurements have been carried out to characterize poly(diisopropyl fumarate) samples, which has been found to be a semiflexible polymer (published), and also to determine the translational diffusion coefficient (In preparation).
(3) Synthesis of regular three-arm star PHIC: We have first tried to synthesize regular three-arm star PHIC smiles by the Goodson-Novak method using a trifunctional titanium initiator. For our purpose of fine characterization, regularity of test samples, i.e., uniformity of the their arm length should be confirmed In order to determine the molecular weight of each arm of the samples prepared by the method, we have tried to hydrolyze the ester groups around the eater of three-arm star PHIC, finding no effective method of hydrolysis. We then have tried to prepare desired samples in another scheme, i.e., coupling three liner PHICs of equal length synthesized by living polymerization by the use of an appropriate trifunctional coupler reagent, a proper scheme being under investigation. Less
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Research Products
(83 results)
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[Presentation] Light Scattering Study of Well-Defined Flexible Polyelectrolyte with Two Cationic Sites per Monomeric Unit2007
Author(s)
M., Osa, G., Mountrichas, K., Hong, S., Pispas, P., F., Britt, J., W., Mays
Organizer
ACS 234th National Meeting
Place of Presentation
Boston, MA, US
Year and Date
2007-08-23
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Phase Behavior of Aqueous Solutions of Linear Poly(N-isopropylacrylamide)s [II]2007
Author(s)
K., Kobayashi, T., Kawaguchi, S., Yamada, M., Osa, T., Yoshizaki
Organizer
Kobe Polymer Research Symposium
Place of Presentation
Kobe, Japan
Year and Date
2007-07-20
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Phase Behavior of Aqueous Solutions of Linear Poly(N-isopropylacrylamide)2006
Author(s)
S., Yamada, T., Kawaguchi, K., Kobayashi, M., Osa, T., Yoshizaki
Organizer
Kobe Polymer Research Symposium
Place of Presentation
Kobe, Japan
Year and Date
2006-07-21
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Phase Behavior of Aqueous Solutions of Poly(N-isopropylacrylamide) [III]-Linear Polymer Samples Prepared by Living Polymerization2006
Author(s)
T., Kawaguchi, S., Yamada, K., Kobayashi, M., Osa, T., Yoshizaki
Organizer
Society of Polymer Science
Place of Presentation
Nagoya, Japan
Year and Date
2006-05-25
Description
「研究成果報告書概要(欧文)」より
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[Book] 基礎高分子科学2006
Author(s)
高分子学会編(吉崎 分担執筆)
Total Pages
450
Publisher
東京化学同人
Description
「研究成果報告書概要(和文)」より
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[Book] 物理学辞典(三訂版)2005
Author(s)
物理学辞典編集委員会編(吉崎 分担執筆)
Total Pages
2688
Publisher
培風館
Description
「研究成果報告書概要(和文)」より
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