Gels: Structures, Properties, and Functions

ItisagreatpleasureforustopresentacollectionofpapersreadattheToyoichiTanaka MemorialSymposiumonGelsheldon10-12September2008inTokyo. ProfessorToyoichi TanakaofMIThasdevelopedgelscienceafterthediscoveryofvolumephasetransition,but unfortunately he passed away so early in 2000. His friends and co-workers decided to organizeasymposiumcommemoratingthe30thanniversaryforthediscoveryofthevolume phasetransitionin1978. ThesymposiumwasheldinastyleofFaradayDiscussions. FullpaperswritteninJapanese weresentbeforehandtoalltheparticipants,anddiscussionswereactiveafterashort(5min) presentationofeachpaper. SinceJapaneselanguageisverydifferentfromEuropeanl- guages,weJapanesecouldspeakfreelywithoutanyhesitation. Althoughalltheparticipants are good at English as proved by their publication of many papers in English, yet the discussionofdelicatenuancescouldbedonebetterinJapanesethaninEnglish. Afterthesuccessfulsymposium,paperswritteninEnglishtakingintoaccountthedisc- sionsduringthesymposiumwerereviewedbyexpertscientists,andthepaperswererevised accordingly. We hope that this collection of papers is interesting and useful for all the scientistsandengineersworkingintheareaofgelsbothinacademiaandindustry. Finally, wethankallthecontributorsandreviewersfortheirenthusiasticefforts. Summer2009 MasayukiTokita KatsuyoshiNishinari v Contents StructureandFunctionalPropertiesofGels CompetitiveHydrogenBondsandCononsolvencyofPoly(N-isopropylacrylamide)s inMixedSolventsofWater/Methanol...1 FumihikoTanaka,TsuyoshiKoga,andFranc,ItisagreatpleasureforustopresentacollectionofpapersreadattheToyoichiTanaka MemorialSymposiumonGelsheldon10-12September2008inTokyo. ProfessorToyoichi TanakaofMIThasdevelopedgelscienceafterthediscoveryofvolumephasetransition,but unfortunately he passed away so early in 2000. His friends and co-workers decided to organizeasymposiumcommemoratingthe30thanniversaryforthediscoveryofthevolume phasetransitionin1978. ThesymposiumwasheldinastyleofFaradayDiscussions. FullpaperswritteninJapanese weresentbeforehandtoalltheparticipants,anddiscussionswereactiveafterashort(5min) presentationofeachpaper. SinceJapaneselanguageisverydifferentfromEuropeanl- guages,weJapanesecouldspeakfreelywithoutanyhesitation. Althoughalltheparticipants are good at English as proved by their publication of many papers in English, yet the discussionofdelicatenuancescouldbedonebetterinJapanesethaninEnglish. Afterthesuccessfulsymposium,paperswritteninEnglishtakingintoaccountthedisc- sionsduringthesymposiumwerereviewedbyexpertscientists,andthepaperswererevised accordingly. We hope that this collection of papers is interesting and useful for all the scientistsandengineersworkingintheareaofgelsbothinacademiaandindustry. Finally, wethankallthecontributorsandreviewersfortheirenthusiasticefforts. Summer2009 MasayukiTokita KatsuyoshiNishinari v Contents StructureandFunctionalPropertiesofGels CompetitiveHydrogenBondsandCononsolvencyofPoly(N-isopropylacrylamide)s inMixedSolventsofWater/Methanol...1 FumihikoTanaka,TsuyoshiKoga,andFranccoiseM. Winnik RheologicalPropertiesofSolutionsofaPolyampholyticBlockCopolymer...9 TomomitsuSekitani,KenjiUrayama,ManabuTsuruta,Masahiko Mitsuzuka,andToshikazuTakigawa Helix-CoilTransitionandAssociationBehaviorofWater-SolublePolypeptides HavingHydrophobicAlkylSideChains...15 KatsuhiroInomata,TomokazuTakai,NoriyoshiOhno,YoshiakiYamaji, ErinaYamada,HidekiSugimoto,andEijiNakanishi EffectsofSurfactantsontheLinearRheologyofTelechelic AssociatingPolymers...23 TsutomuIndei Time-DependentFlowPropertiesofTransientHydrogelswith TemporalNetworkJunctions...3 1 IsamuKaneda,TsuyoshiKoga,andFumihikoTanaka StressGrowthinTransientPolymerNetworksunderStartup ShearFlow...39 TsuyoshiKoga,FumihikoTanaka,andIsamuKaneda Self-assemblingStructuresandSol-GelTransitionofOptically ActiveandRacemic12-HydroxystearicAcidsinOrganicSolvents...47 HiroyukiTakeno,TomomitsuMochizuki,KazutoYoshiba,ShingoKondo, andToshiakiDobashi TheGelPointandNetworkFormationinthePolymerisation ofanEpoxy-AmineSyst...