为提升环氧树脂固化膜对器件的环境适应性和使用寿命,探究了热固性环氧树脂甲基取代数量对热固性环氧树脂固化膜性能的调控规律。选取双酚A环氧树脂、双酚F环氧树脂、二甲基双酚F环氧树脂和四甲基双酚F环氧树脂为研究对象,分别加入引发剂、感光性树脂、固化剂、活性稀释剂和填颜料,经紫外光/热双重固化工艺制备了具有三维交联网络的固化膜,研究了甲基数量对固化膜热力学性能、电性能、疏水性以及附着力和铅笔硬度的影响。结果表明:随着甲基数量的增加,固化膜的玻璃化转变温度从127℃升至149℃,储能模量由4040MPa增至5071MPa,热膨胀系数由50μm/(m·℃)降低至43μm/(m·℃),但热稳定性有所下降,5%热失重温度由320℃降至278℃;在电性能方面,随着甲基数量的增加,107Hz条件下固化膜的介电常数由3.6降至2.6,而体积电阻率由2.2×1015Ω·cm升至8.3×1015Ω·cm,击穿强度由68kV/mm上升至115.1kV/mm;甲基数量越多,其疏水性能随之增强,附着力有所下降。此外,4种固化膜的铅笔硬度均大于或等于6H,性能较优异。
To enhance the environmental adaptability and service life of the epoxy resin cured films for devices,the regulation rules of the number of methyl substitutions in thermosetting epoxy resins on the performance of the thermosetting epoxy resin cured films were investigated.In this paper,bisphenol A epoxy resin (DGEBA),bisphenol F epoxy resin (DGEBF),dimethylbisphenol F epoxy resin and tetrmethylbisphenol F epoxy resin were selected as the research objects.By adding initiator,photosensitive resin,curing agent,reactive diluent and filler pigment,respectively,the cured films with three-dimensional crosslinked networks were prepared by ultraviolet light/heat dual curing process.The key research focused on the influence of the number of methyl groups on the thermodynamic properties,electrical properties,hydrophobicity,adhesion and pencil hardness of the cured films.The results showed that with the increase of the number of methyl groups,the glass transition temperature of the cured films rose from 127℃ to 149℃,the energy storage modulus increased from 4040MPa to 5071MPa,the coefficient of thermal expansion decreased from 50μm/(m·℃) to 43μm/(m·℃).However,the thermal stability decreased,and the T5% dropped from 320℃ to 278℃.In terms of electrical properties,as the number of methyl groups increased,the dielectric constant of the cured films decreased from 3.6@107Hz to 2.6@107Hz,while the volume resistivity increased from 2.2×1015Ω·cm to 8.3×1015Ω·cm,and the breakdown strength increased from 68kV/mm to 115.1kV/mm.The increase in the number of methyl groups enhanced the materials' hydrophobicity while concomitantly reducing their adhesion strength.Moreover,all four cured films exhibited pencil hardness values of ≥6H,indicating excellent surface hardness.
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