ブックタイトル高分子　POLYMERS　62巻10月号

概要

高分子　POLYMERS　62巻10月号

Hot TopicsAwards for Encouragement of Research in Polymer Science given by the Society of Polymer Science, JapanDilute Solution Properties of Semiflexible Star andRing Polymers: Crossover from the Rigid Chain tothe Random CoilDaichi IDADepartment of Polymer Chemistry, Kyoto UniversityE-mail: ida@molsci.polym.kyoto-u.ac.jpTheoretical and/or Monte Carlostudies are made of dilute solutionproperties of semiflexible star andring polymers on the basis of theKratky?Porod wormlike chainmodel. We clarify the behavior ofthe properties in the range of thecrossover from the rigid chain tothe random coil. The ratio g h of theintrinsic viscosity of the wormlikestar to that of the linear wormlikechain, both having the same totalcontour length L, is calculated. It isfound that g h remarkably dependson the chain stiffness (the stiffnessparameter l ?1 ) and hydrodynamicdiameter. Futher, it is shown thateffects of the number f of arms onBioelectrocatalytic Application of Conducting PolymerFilmsTakashi KUWAHARATo develop degradable elastomers,we synthesized network poly(vinylether) containing imine linkages.The a, w-formylated poly(n-butylvinyl ether) (poly(NBVE))were prepared by living cationicpolymerization of NBVE using abifunctional initiator and water asthe terminator. Network poly(NBVE)with imine linkages were preparedby crosslinking reaction of theformylated poly(NBVE) with thetris(2-aminoethyl)amine. The GPCcurves of the products formed bythe crosslinking reaction clearlyshifted to a higher-moleculargh become more significant as thechain becomes stiffer (Fig. 1). Thesecond virial coefficient A 2 at theΘtemperature of the wormlike ring,resulting only from the topologicalinteraction between a pair of therings, is evaluated. It is shown thatA 2 first increases and then decreasesafter passing through a maximum asthe molecular weight increases (Fig.2). In each study, a simple formulauseful for analysis of experimentaldata is proposed.Polymer Journal, 40, 257 (2008)Polymer Journal, 42, 735 (2010)Polymer Journal, 44, 115 (2012)Fig. 1 Plots of g h against the logarithm of the reduced contour length lL.Fig. 2 Double-logarithmic plots of the dimensionless quantity lVE/L 2 (∝A2)against lL (∝M).Department of Bioengineering, Faculty of Engineering,Nagaoka University of TechnologyE-mail: kuwataka@vos.nagaokaut.ac.jpWe have reported on enzymeelectrodes based on conductingpolymer films. These electrodesgenerate power output in a biofuelcell by using biomass and oxygen asanodic fuel and oxidant, respectively.The conducting polymer filmacts as a support of enzyme anda current collector. We havedemonstrated that the conductingpolymer film plays an importantrole in the performance of theenzyme electrode. Recently, we havedeveloped direct electron transfertype electrodes and a fuel productiontype electrode. The former involvesdirect electron transfer from thefilms of polythiophene derivativesto oxygen-reduction enzymes. Thelatter produces fuel on the surfaceof the conducting polymer film byenzymatic reaction and oxidizes theproduced fuel immediately.Polymer Preprints, Japan, 61, 4854(2012)Polymer Journal, 44, 1117 (2012)Bioelectochemistry, 91, 28 (2013)Synthesis of Network Poly(Vinyl Ether)s ContainingDynamic Covalent BondsTakeshi NAMIKOSHI*, Miki MURATA, and Shinji WATANABEMaterials Science and Engineering, Kitami Institute of TechnologyE-mail: takenami@mail.kitami-it.ac.jp*weight region and became broader.Although the original formylatedpoly(NBVE) was a sticky liquid, theobtained network polymers hadself-membrane-forming ability andexhibited elasticity. The degradationreaction was carried out with anexcess amount of phenylethylamine.The GPC curve of the obtainedpolymer shifted to a low-molecularweightregion.Polymer Preprints, Japan, 61, 2476(2012)高分子62巻10月号（2013年）c2013 The Society of Polymer Science, Japan593