聚倍半硅氧烷(poss)改性的led封装硅胶

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1、杭州师范大学硕士学位论文AbstractComparedwithtraditionlightingdevice，light-emittingdiode(LED)exhibitsvariousadvantages，suchashigherluminosityatlowcurrentsandvoltages，longerservicelife，andenvironmentalfriendliness．Becauseofthesefavorablecharacteristics，LEDisbecomingmoreandmorewidespreadly．LEDdevicemade

2、upwithchips，wires，brackets，conductiveadhesivesandpackagingmaterials．Thefunctionofthepackagingmaterialsistoprotectthechips．ThepackagingmaterialshavebecomeoneofthemostimportantfactorsforLEDdevice．Thepackagingmaterialsshouldhavehightransparencyandgood．antiultravioletability．t，Atpresent，packa

3、gingmaterialsofcommonLEDdevicearemainlyofepoxyresins．Buttheepoxyresinshaveseveraldisadvantages．Atfu'st，epoxyresinswillturnyellowafterusingacontentoftime，whichwilldecreasethetransmittance．Secondly,thehigherthermalresistanceofepoxyresinleadstotherapidriseofthechip’Stemperatureandaccelerates

4、thedecayoftheLEDdevices．Whatisworse，therapidthermalexpansionwillmakethedeviceopencircuit．．SiliconematerialsareidealpackagingmaterialsforLEDbecauseoftheiroutstandingperformances．Inthisthesis，theoctavinylpolyhedraloligomericsilsesquioxane(OVPOSS)andeightpolyfourmethylammoniumsilicatewerepre

5、paredtomodifiedthevinylsiliconeoilviaringopeningpolymerization．Thenthevinylsiliconeoilmixedwithacertainproportionofhydrogensiliconeoil，platinumcatalystandcured．Theresultsaleasfollows：(1)Ring—openingcopolymerizationofOVPOSSwithD3topreparethePOSSmodifiedvinylsiliconeoil．Thefeaturesofthecopo

6、lymerizationwereinvestigatedsymatically．Thenthemodifiedvinylsiliconeoil、hydrogen-containedsiliconeoilandplatinumcatalystweremixturedtopreparedsiliconematerialsforLEDpackaging．Thehardnessofthematerialisintherangeof0-30ShoreA．(2)TheTMAOHisthecatalystforthering-openingcopolymerizationofD4and

7、Iv杭州师范大学硕士学位论文Abstract现M锄forpreparinghighrefractivemodifiedvinylsiliconeoil．Thecopolymerizationwasinvestigatedindetail．Thenthevinylsiliconeoil，hydrogen-containedsiliconeoilandplatinumcatalystweremixturedtogethertopreparesiliconematerialsforLEDpackaging．Thehardnessof