环氧灌封材料的制备、结构与性能研究

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1、西北工业大学硕士学位论文但活性硅微粉用量较大，材料的工艺性能明显降低;纳米Si0:对环氧灌封材料具有显著的增强和增韧作用，冲击强度、弯曲强度由原来的13.95kJ/m2和64.95MPa分别提高到27.64kJ/m2和136.68MPa。蒙脱土使环氧灌封材料的冲击强度和弯曲强度由纯环氧树脂的14.24kJ/m“和91.96MPa分别提高到18.24kJ/m2和109.84MPa;耐热性得到了很大提高，当有机蒙脱土含量为5%时纳米复合材料玻璃化温度比纯环氧固化物的高出13.20C;热变性温度最大提高160C;线膨胀系数当蒙脱土含量为1%时，环氧

2、灌封材料的线膨胀系数比未加时降低了44%，吸水率明显下降。关键词环氧树脂，灌封材料，硅微粉，纳米Si02l蒙脱土，纳米复合材料，原位聚合，插层聚合ABSTRACTABSTRACTEncapsulatingmaterialsofepoxyresinaremodifiedwithHGH,nano-SiO2andorganophilicmontmorillonite,inthepresentinvestigation,themicrostructue,somepropertiesandinfluencefactorsaboutnano-SiO2an

3、dorganophilicmontmorillonitemodifiedEncapsulatigmaterialshavebeensystematicallystudiedusingX-raydiffraction,electronmicroscopyanddifferentialthermalanalysismeasurementtechniques.ThemodifiedepoxyresinmaterialswithHGandHGHhavefirstbeenpreformed.Propertiestestresultsshowthatth

4、eelectricitypropertiesandheatdistortiontemperatureareimprovedbyadditionofHGorHGHintheepoxyresinmaterials,andthematerialscontainingHGorHGHhavelowerlinearthermalexpansioncoefficiencycomparedwithneatepoxyresin.Whenthemodifiedmaterialswereinwaterfor24hours,themechanicalproperti

5、esandelectricitypropertiesofthematerialswithHGHarebeterthanthatofthematerialswithHG.Epoxyresin/nano-Si02compositematerialswereobtainedfrominsitupolymerization,andthenthemicrostructureandpropertiesofthematerialsareinvestigatedbytransmissionelectronmicroscopy,scanningelectron

6、microscopyanddiferentialscanningcalorimetry,etc.Resultsindicatedthatthemicrostructureofthemodifiedmaterialsshewthestructureofnanometermaterials,andthemechanicalproperties,heatdistortiontemperatureandelectricitypropertiesandofthematerialswereallimprovedbyadditionofnano-SiO2.

7、Afterthenano-Si02waspretreatedwithorganicsiliconcouplingagent(H2N-CH2CH2CH2叫Si(OC2HS)})，thenano-Si02particlesweredispersedinepoxyresinmatrixhomogeneously.Whenthecontentofnano-Si02is3wt%,themechanicalpropertiesofthenanocompositeswerethebest,impactstrengthis98%higherthanthato

8、fepoxyresin,flexuralstrengthis112%higherthanwhennano-SiO2isOwt%.Thediferentialscan