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通过3D打印技术具有优异电磁屏蔽性能的导热聚乳酸复合材料

已有 1604 次阅读 2022-5-25 09:14 |系统分类:论文交流

Teng-Bo Ma, Hao Ma, Kun-Peng Ruan, Xue-Tao Shi*, Hua Qiu, Sheng-Yuan Gao and Jun-Wei Gu*. Thermally Conductive Poly(lactic acid) Composites with Superior Electromagnetic Shielding Performances via 3D Printing Technology. Chinese Journal of Polymer Science, 2022, 40(3): 248-255. （中国科技期刊卓越行动计划）（入藏号WOS:000743394600001）

论文链接：https://doi.org/10.1007/s10118-022-2673-9

Abstract

This work proposes a facile fabrication strategy for thermally conductive graphite nanosheets/polylactic acid sheets with ordered GNPs (o-GNPs/PLA) via fused deposition modeling (FDM) 3D printing technology. Further combination of o-GNPs/PLA with Ti₃C₂T_x films prepared by vacuum-assisted filtration were carried out by “layer by layer stacking-hot pressing” to be the thermally conductive Ti₃C₂T_x/(o-GNPs/PLA) composites with superior electromagnetic interference shielding effectiveness (EMI SE). When the content of GNPs was 18.60 wt% and 4 layers of Ti₃C₂T_x (6.98 wt%) films were embedded, the in-plane thermal conductivity coefficient (λ_//) and EMI SE (EMI SE_//) values of the thermally conductive Ti₃C₂T_x/(o-GNPs/PLA) composites significantly increased to be 3.44 W/(m·K) and 65 dB (3.00 mm), increased by 1223.1% and 2066.7%, respectively, compared with λ_// (0.26 W/(m·K)) and EMI SE_// (3 dB) of pure PLA matrix. This work offers a novel and easily route for designing and manufacturing highly thermally conductive polymer composites with superior EMI SE for broader application.

以聚乳酸（PLA）为基体，石墨纳米微片（GNPs）为导热填料，采用熔融沉积成型（FDM）3D打印技术制备GNPs有序排列的GNPs/PLA（o-GNPs/PLA）片材，与真空辅助抽滤法制备的导电Ti₃C₂T_x薄膜复合，经“层层铺叠-热压”工艺制备Ti₃C₂T_x/(o-GNPs/PLA)导热电磁屏蔽复合材料。当GNPs质量分数为20 wt%时，o-GNPs/PLA导热复合材料具有最佳的综合性能，其拉伸强度、熔体体积流动速率和面内热导率（λ_//）分别为47.5 MPa、13 cm³/(10 min)和2.90 W/(m·K)，是相同GNPs用量下共混热压制备r-GNPs/PLA导热复合材料λ_//（1.82 W/(m·K)）的1.6倍。引入4层Ti₃C₂T_x（6.98 wt%）薄膜后，Ti₃C₂T_x/(o-GNPs/PLA)导热电磁屏蔽复合材料的λ_//和面内电磁屏蔽效能（EMI SE_//）快速提升至3.44 W/(m·K)和65 dB（3.00 mm），较纯PLA的λ_//（0.26 W/(m·K)）和EMI SE_//（3 dB）分别提升了1223.1%和2066.7%。