]●579aP]aMPMe[ru力ss圧erP[ 超臨界流体36SCW超臨界水22.1 Liquid液体Critical 臨界点PointSolid固体0.1(常圧)Ambient conditionGas気体1003740Temperature [ºC]温度[ºC]PowderSoaked in aqueous NH3of polyesterRelease of the monomer pHpOHTemperature[oC]The neutral pH of water is controlled by temperature and pressure.AssociateprofessorOSADAMitsumasaPh.D.TohokuUniv.Japan.2005.Assoc.Prof.IchinosekiNationalColl.ofTech.2006-2014.VisitingScholar,theUniversityofMichigan,USA.2007-2008.Assoc.Prof.ShinshuUniv.2014-.AssociateProfessorKOHSAKAYasuhiroProf.KohsakareceivedhisPh.D.fromTheTokyoTech.in2011.HestartedhisacademiccarrierasanassistantOsakaUniversityandmovedtoShinshuUniversityin2015.HewasselectedinJSPSPRESTOprogramin2022.In2023,heisreceivedthetitleof‘RisingfromShinshuUniversityand‘theMEXTYoungScientists'PrizefromMEXT.Althoughpolymermaterials,e.g.fibers,plasticsandrubbersareessentialinourdailylife,theirwastecausessocialproblemsuchasmarinepollutionanddepletionofpetroleumresources.Prof.Kohsakainvestigatesthedevelopmentsofnewpolymermaterialsredesignedfromthestartingmoleculesinordertosolvetheseproblems.Forexample,hedevelopedanewpolymermaterialdegradableinaqueousmediatoenvironment-friendlychemicals,whileasustainableplasticthatregeneratesthestartingmaterialswascreated.Healsoinnovatedanovelmethodtopreparepolyesterswithlowenergyconsumption.Biomassconversioninhigh-temperaturewater(HTW)andsupercriticalwater(SCW)hasbeenstudied.HTWreferstowaterinitsliquidstatebelowitscriticaltemperatureandpressure(374ºC,22.1MPa),whereasitbecomesahighlycompressiblefluidcalledSCWabovethispoint.Wearealsousingawaterjetmachineforwetpulverizetreatmentofbiomass.Wateristhemostenvironmentallybenignsolvent.Thetargetbiomassarewood(lignin),fishscale(protein),squidpen(chitin).Forexample,wearetryingtoproducechitinnanofiberfromsquidpenbyawaterjetmachine.professorinresearcher’StarAnadvantageofbiomassconversioninHTWandSCWisthathotwatercanserveasasolvent,areactant,andacatalyst.Whilemanybiomass(e.g.,proteinandchitin)arenotwater-solubleatambientconditions,mostarereadilysolubilizedinHTWorSCW.Inaddition,H+andOH-concentrationsofHTWarehigherthanthoseofambientwaterandtheacidorbasecatalyzedreactionsproceedwithoutaddingcatalysts.Studentswouldworkatchemical,food,andpharmaceuticalcompaniesasanengineerandaresearcher.Ihopethatthestudentswillmakethebiggestimpactinthefieldofnewenvironmentalbenignchemicalengineering.NanofiberproductionfromunusedagriculturalresourcesUsing acetyl salicylic acid (aspirin), we have developed a new plastic for easy chemical recycling, a resource circulation through the decomposition to the raw materials and resyntheses. This is a first example of vinyl polymers (polymers consisting of carbon backbone) designed for chemical recycling.Polyesters decomposition in aqueous ammonia. The decomposition changes the solution color yellow by releasing the monomer.InvestigationofHTWandSCWasnewchemicalreactionfieldFunctionalMaterialsbiomassfromwasteDepartment ofDepartment ofOutlook for researchOutlook for students after graduationOutlook for researchSincepolymerchemistrysupportschemicalindustry,wehaveachancetodiscoveranewmaterialforpracticalapplication.Wealwaysenjoyexperimentsinpurechemistry,whileourgrouphasmanycollaborationswithinter-/intra-nationalcompaniesandresearchinstitutes.Weinnovateavarietyofnovelmaterialsfromplasticsforasustainablesocietywithintelligentmaterials.Outlook for students after graduationAllstudentscontinuetheirresearchandstudiesinmasterprogramofourgraduateschoolinordertobecomeresearchers/engineersinpolymerandorganicchemistry.Manystudentsthengotocompaniesinthechemicalindustry,whilesomestudentslearnmoreinourdoctoralprogram.High-temperature water(HTW)and Supercritical water（SCW)超臨界水とはProperties of HTW and SCWPressure24MPa1125200400600High-temperature waterWaste BiomassFunctionalMaterialsLignin(Wood）PhenoliccompoundsProtein（Fish scale）CollagenPeptideβ-Glucan（Mushroom）Oligo-saccharideChitin（Crab）Chemistry and MaterialsChemistry and MaterialsProductionofFunctionalMaterialsfromBiomassbyUsingOnlyWaterA Great Chance to Save the World with ‘Epochal Plastic’ through Molecular Design
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