離子交聯(lián)魔芋葡甘聚糖凝膠的制備及流變性能研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文離子交聯(lián)魔芋葡甘聚糖凝膠的制備及流變性能研究姓名：郭金明申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：高山俊20080401武漢理1二大學(xué)碩士學(xué)位論文AbstractKonjacglucomannan(AbbrKGM)，anaturalwatersolublepolysaccharideoriginatingfromthetubersofkonjac，hasfavorablewaterpreservingthicken

2、ingfilmingabilitiesandbiocompatibilityTherecentstudiesonthefoundationandapplicationsofkonj’ac磬ucomannaninfoods，bio—technical，petroleumchemicalandsomenewmaterialsfieldscametofrontThemaincontentsandconclusionswere弱follows：

3、(1)ThermoreversibleKGM／boraxcomplexgelswerepreparedusingborax弱crosslinkerThemechanismwasbelowGelnetworkwasformedimmediatelythroughthecrosslinkingreactionbetweenborateionsdissociatedfromboraxandthecisdiolsitesonthepolysac

4、charidechainsDynamicviscoelasticrheologymeasurementsandanalysisshows，atlowcroscillationfrcquency，thecomplexgelsbehavelikeliquid，whereasathigherfrequencytheyrelaxliketruegelmaterialswiththepredominantelasticrelaxationresp

5、onseAnobviousplateauvalue(G’D)ofstoragemodulus(G’)andamaximumandminimuminlossmodulus(G”)wereobservedontherelaxationspectrumThecharacteristicviscoelasticfunctionswerestudiedasafunctionofconcentrationsofkoniacghcomannanand

6、borax，strain，andtemperatureTheexperimentsandanalysisshowthemodulusobeytimeconcentrationsuperpositionByusingmathematicalderivationoftheexperimentresults，wegottheempiricalexpressionofquantitativeG’ptotheconcentrationofKGMa

7、ndboraxMeanwhile，themodulusofthecomplexgelsdbeytime—temperaturesuperposition，Relaxationandcrosslinkingenergiesforthegelswerecalculatedfromthesuperpositioncurves(2)SecondwepreparedthethermoreversibleKGM／organicboratecompl

8、exgelsusingorganicborateascrosslinkerThegelnetworkwasformedthroughthecrosslinkingreactionbetweenborateionsdissociatedfromorganicborateandthecis—diolhydroxylgroupsonthemannoseunitsofpolysaccharidechainsUnlikewiththesystem

9、ofKGM／boraxborateionshavetoescapefromthebindingofcoordinationagentandthencallcrosslinkwiththecisdiolhydroxylgroupsSOthesystemofKGM／organicborategelsreflectedthedynamiccharactersandcrosslinkdelayedThetheologicalexperiment

10、sandanalysisshowedthecriticals01geltransitionpointsandthegelationtimecanbeexactlydeterminedbytheWinterChamboncriterionTheeffectsoftemperatureandcompositeratioontheshearstoragemodulus(G’)，thelossmodulus(G”)andthesol—geltr

11、ansitionpointswereinvestigatedTemperaturedependenceofmodulusofthecomplexgelsshowedthatthecharacteristictemperaturecorrespondingtothegel—soltransition，whichwascalledgelbrokentemperaturecanalsobeexactlydeterminedbytheWinte