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Synthesis and characterization of novel Bis-GMA derivate for resin-based dental restorative materials  
Synthesis and characterization of novel Bis-GMA derivate for resin-based dental restorative materials
資料類型: PDF文件
關(guān)鍵詞: bis-GMA  derivate  viscosity  reaction  kinetics  
資料大小: 962K
所屬學科: 高分子化學
來源: 來源網(wǎng)絡
簡介:
2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane(Bis-GMA)isakindofmostcommonusedbaseresinmonomerfordentalrestoration.DuetothehydrogenbondingbetweenhydroxylgroupsinBis-GMA,theviscosityoftheresinreachesahighlevelthatresultsinalargeamountofdiluentsareintroducedintotheresinsystemtodecreasetheviscosityforbetterapplication.However,anumberofadverseeffectsarecomingwiththediluentssuchasincreasedcuringshrinkage.Substitutinghydroxylgroupswhicharethesourcesofhighviscositymightbeanappropriatewaytoreducetheamountofdiluentsandweakentheaccompaniedadverseeffects.Inthisstudy,thehydroxylgroupsinBis-GMAwerereplacedbyacetylgroups,andtheviscositywasdecreasedfrom820Pa.sto11Pa.ssignificantly.DifferentialScanningCalorimeter(DSC)wasusedforinvestigatingthereactionkineticsofthisnovelmonomer.Theresultsshowedthatthefinalconversionofthemodifiedmonomercanreachnearly85%whilethecorrespondingvalueforBis-GMAisabout75%.
上傳人: zhu
上傳時間: 2011-09-26 13:56:36
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cellulose888888    2013-03-12 14:08:17
thanks a lot@
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