Journal of The Adhesion Society of Japan
Online ISSN : 2187-4816
Print ISSN : 0916-4812
ISSN-L : 0916-4812
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Volume 39, Issue 11
Displaying 1-5 of 5 articles from this issue
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Review
Review
Technical Report
Technical Report
  • HardeningTemperatureandHeat-ResistancePropertiesofBenzoxazineResin
    Nobuyuki FURUKAWA, Yukihiro WADA, Masatoshi YUASA, Naoki YOKOYAMA, Tsu ...
    2003Volume 39Issue 11 Pages 416-422
    Published: November 01, 2003
    Released on J-STAGE: October 31, 2014
    DOIhttps://doi.org/10.11618/adhesion.39.416
    JOURNAL FREE ACCESS
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    Recently,benzoxazinehasbeenreportedasanewhighperformancethermosettingresinwithring-openingreactivity,whichhassuperiorpropertiessuchashighheat-resistance,highglasstransitiontemperatureandsmallvolumetricshrinkage.Varioushi-functionalbenzoxazinesarepreparedfromcorrespondingbis-phenolcompoundsforstudiesoftheirexothermichardeningbehaviour,thermaldecompositionandthermomechanicalpropertiesafterthermalcuringat200℃.Benzoxazineswithelectron-withdrawingspacerexhibitexothermichardeningatlowertemperaturefromtheresultsofdifferentialscanningcalorimetricanalysis.Thermaldecompositionofanycuredbenzoxazinescommenceinthevicinityof300℃,despitetheirdifferentstructuresinspacers.Inaddition,benzoxazinesexceptwithalkylsubstituentsinspacers,revielover50wt%ofresidualweightat700℃.Resultsofdynamicmechanicalanalysisonbenzoxazinesdemonstratethatthespacersaffecttheirhighmodulusandglasstransitiontemperatures.
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Original Paper
  • DevelopmentofUV-LEDEncapsulantUsingHydrogenatedBis-phenol-AGlycidylEtherandAcidAnhydride.
    Yasumasa MORITA
    2003Volume 39Issue 11 Pages 410-415
    Published: November 01, 2003
    Released on J-STAGE: October 31, 2014
    DOIhttps://doi.org/10.11618/adhesion.39.410
    JOURNAL FREE ACCESS
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    Curingofhydrogenatedbisphenol-AglycidyletherwithanhydridewereinvestigatedasatransparentencapsulantforUVlightemittingdiode(LED).ToreducediscolorationcausedbyUVand/orthermaleffect,chemicalstructureofacceleratecatalyst,cycloaliphaticepoxyresinconcentrationandantioxidantwereexamined.Byusingcatalystwithsmallamountofdoublebond,UVdiscolorationwasdecreased.AscomparedwithconventionalLEDencapsulantofbisphenol-Aglycidylether,thermaldiscolorationwashighandglasstransitiontemperature(Tg)waslow.Additionofcycloaliphaticepoxyresinwith10wt%increasedtheTgtobeover120℃,whichisalmostthesamevalueasconventionalone,butthermaldiscolorationwasstillhigherthanconventionalone.Toimproveresistanceagainstthermaldiscoloration,additionofantioxidantwasstudied・Incaseofphosphorousantioxidant,UVdiscolorationwasacceleratedHowever,whenphenolicantioxidantsuchas2,6-di-tert-butyl-4-mehtyl-phenol(BHT)wasused,thermaldiscolorationwasreducedwithoutincreasingUVdiscoloration.
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