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Volume 72, Issue 9
Displaying 1-4 of 4 articles from this issue
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Comprehensive Papers
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Daichi IDA2015 Volume 72 Issue 9 Pages 529-538
Published: September 25, 2015
Released on J-STAGE: September 25, 2015
Advance online publication: July 30, 2015JOURNAL FREE ACCESSThere are briefly summarized our recent theoretical and/or Monte Carlo studies of dilute solution properties of semiflexible stars and rings on the basis of the Kratky–Porod (KP) wormlike chain model. For the regular three-arm KP stars, effects of chain stiffness on the intrinsic viscosity [η], translational diffusion coefficient (effective hydrodynamic radius), and second virial coefficient A2 in a good solvent are examined as functions of the reduced contour length λL, where λ−1 is the stiffness parameter and L is the total contour length. A similar examination is also done for [η] of the regular four-arm KP stars. For the KP rings, effects of the topological constraint in addition to the chain stiffness on the mean-square radius of gyration, [η], and scattering function are examined. Further, the results for A2 of the ideal KP rings, which is related to the intermolecular topological interactions, are presented and then compared with the data in the literature for ring atactic polystyrene at Θ for large molecular weight.View full abstractDownload PDF (927K) -
Junpei KUWABARA2015 Volume 72 Issue 9 Pages 539-549
Published: September 25, 2015
Released on J-STAGE: September 25, 2015
Advance online publication: July 22, 2015JOURNAL FREE ACCESSPolycondensation reactions using C-H direct arylation were investigated for the development of a new synthetic approach to conjugated polymer materials. Detailed investigation on reaction conditions of direct arylation polycondensation makes it possible to prepare high-molecular-weight polymers in good yields. The direct arylation polycondensation has several advantages in terms of fewer reaction steps, reduced amount of side products, and high purity of the products. The obtained highly-pure polymer showed better performance in OFET and OPV performance than polymer synthesized by a conventional method. Fundamental studies in the optimization of reaction conditions and the reaction mechanism provided important insights for further development of this method to be a reliable and practical production method of conjugated polymer materials.View full abstractDownload PDF (1300K) -
Ryohei KAKUCHI2015 Volume 72 Issue 9 Pages 550-560
Published: September 25, 2015
Released on J-STAGE: September 25, 2015
Advance online publication: July 14, 2015JOURNAL FREE ACCESSThis highlight represents recent developments in polymer analogous reactions, which were realized via tailoring organic transformation reactions. The organo-activation technique successfully enabled post-polymerization modification reactions of stable polymeric esters with amines. In addition, design and synthesis of activated esters enable new functionalities for post-polymerization modification reactions, which included stimuli-triggered reactivity changes and sequence specific installation of functional units. The Mitsunobu reaction was also successfully integrated into post-polymerization modification reactions, essentially enabling sequential post-polymerization modification and a facile synthetic route to polyamine scaffolds. All in all, post-polymerization modifications based on multicomponent reactions (MCRs) such as the Kabachnik-Fields reaction allowed concurrent installation of two or more functionalities on a single monomeric unit within polymeric structures.View full abstractDownload PDF (1231K) -
Shinsuke INAGI2015 Volume 72 Issue 9 Pages 561-572
Published: September 25, 2015
Released on J-STAGE: September 25, 2015
Advance online publication: August 07, 2015JOURNAL FREE ACCESSThe electron-transfer of π-conjugated polymers on an electrode has been studied in detail in order to use them for conducting and electrochromic materials in electrochemical devices. In this study, we focused on their charged states as an intermediate for subsequent chemical reactions based on the concept of electro-organic synthesis. The post-functionalization of π-conjugated polymers was successfully achieved when a reactive dopant (a counter ion derived from the electrolyte) was used for the electrochemical reactions. For example, anodic halogenation, cathodic reduction, and gradient oxidation on bipolar electrodes could successfully tune the optical and electrochemical properties of the polymers.View full abstractDownload PDF (1425K)
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