Due to layer by layer printing, the interlayer adhesion of resin used in extrusion‐based additive manufacturing (AM) is poor, while thermal curing affects the accuracy of the resin. Therefore, methods of photo‐curing and nanomodification were used in this work to improve the adhesion between layers and the overall performance of AM resins. Specifically, ethylene‐vinyl acetate (EVA) copolymer with dual curing agent of benzophenone/triallyl isocyanurate (BP/TAIC) and nano‐silica (NS) were introduced. The results of light transmittance, scanning electron microscopy and gel content test showed that BP/TAIC with NS were proved to be able to improve the curing process of EVA. The filling of a small amount of NS did not act as ultraviolet light barrier, but instead improved the photo‐curing of the resin and reduced the amount of agents. UV curing also improved the adhesion between layers of EVA resin. The tensile strength was 7.1% higher than that of EVA/NS/BT without curing. At the same time, due to good interface bonding and dispersion, the thermal conductivity of resin improved from 0.212 W/m·k to 0.252 W/m·k. A 16.1% raise in tensile strength and a 10.0% increase in the volume resistivity were demonstrated for the 3.0 wt% NS. Furthermore, this resin is potential to be used in AM.

中文翻译：

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紫外光固化EVA树脂的纳米二氧化硅改性，用于增材制造

由于是逐层印刷，因此用于挤出型增材制造（AM）的树脂的层间粘合性很差，而热固化会影响树脂的精度。因此，在这项工作中使用了光固化和纳米改性的方法来改善层之间的粘合性和AM树脂的整体性能。具体而言，介绍了具有二苯甲酮/异丙烯脲三烯丙基酯（BP / TAIC）和纳米二氧化硅（NS）双重固化剂的乙烯-乙酸乙烯酯（EVA）共聚物。透光率，扫描电镜和凝胶含量测试结果表明，BP / TAIC和NS可改善EVA的固化过程。填充少量的NS不会起到紫外线的作用，但可以改善树脂的光固化性能，并减少试剂用量。UV固化还改善了EVA树脂层之间的附着力。拉伸强度比未固化的EVA / NS / BT高7.1％。同时，由于良好的界面结合和分散性，树脂的热导率从0.212 W / m·k提高到0.252 W / m·k。对于3.0wt％的NS，抗张强度提高了16.1％，体积电阻率提高了10.0％。此外，该树脂有可能用于增材制造。