聚乙烯醇-聚氧化乙烯復(fù)合體系的制備與性能研究.pdf

1、浙江大學(xué)碩士學(xué)位論文聚乙烯醇聚氧化乙烯復(fù)合體系的制備與性能研究姓名：丁維申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料工程指導(dǎo)教師：杜淼20120906浙江大學(xué)碩士學(xué)位論文AbstractAbstractTwokindsofbio—friendlyandwatersolublepolymerpoly(vinylalcoh01)(PVA)andultrahighmolecularweightpoly(ethyleneoxide)(PEO)wereuseda

2、sthemainrawmaterialsinthispaperAfterblendingthetwokindsofaqueoussolution，thecompositehydrogelswithhighmodulusandlowfriction，andtransparentcompositefilmswithhightensilestrengthwereobtainedOurinvestigationsmainlyincludethe

3、followingtwoparts：(1)Therheologicalbehaviorsofthemixedsolution，aswellasthemechanicalpropertiesandthefrictionalbehaviorsofthecompositehydrogelswereinvestigatedindetailThePVAaqueoussolutionchangesfromtheviscousdominatedtoe

4、lasticdominatedinlowerangularfrequencyregionafteraddingPEOandhydroxyapatite(HA)ThecompressivemodulusofPVA／PEO／HAcompositehydrogeldependsonthedistributionofHAparticlesTheHAparticlesmodifiedbystearicacidcoulddisperseunifor

5、mlyinPVAaqueoussolution，accordingly，thecompositehydrogelswithhighcompressivemoduluswereobtainedOntheotherhand，PVA／PEO／HAcompoitehydrogelsshowedlowerfrictionalstressthanthePVAgelbothinlowandhighvelocityregion(2)Therheolog

6、icalbehaviorofthemixedsolutionandthemechanicalpropertiesofthecompositefilmswereinvestigatedTheresultsindicatedthatthetensilestrength，strengthandelongationatbreakofthefilmswereimprovedafteraddingasmallamountofultra—highmo

7、lecularweightPEOandincreasedwiththeincreaseofPEOcontentAlthoughtheintroductionofPEOcausedthecrystallinityofPVAtodrop，thesizeofcrystallineregionofPVAdecreasedanddistributeduniformlyItisbelievedthatthesmallcrystallineregio

8、nsinfactincreasedthenumberofphysicalcrosslinkingpointsandleadtotheenhancementofthosemechanicalperformancesBesides，theintroductionofultrahighmolecularweightPEOalsogaverisetotheincreasingofglasstransitiontemperatureforthec