Teng-Bo Ma, Hao Ma, Kun-Peng Ruan, Xue-Tao Shi*, Hua Qiu, Sheng-Yuan Gao and Jun-Wei Gu*. Thermally conductive polylactic acid composites with superior electromagnetic shielding performances via 3D printing technology. Chinese Journal of Polymer Science, 2022, 10.1007/s10118-022-2673-9. 2020IF=3.603.(2區(qū)化學類期刊,中國科技期刊卓越行動計劃-梯隊類期刊項目)
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 Ti3C2Tx films prepared by vacuum-assisted filtration were carried out by “l(fā)ayer by layer stacking-hot pressing” to be the thermally conductive Ti3C2Tx/(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 Ti3C2Tx (6.98 wt%) films were embedded, the in-plane thermal conductivity coefficient (λ//) and EMI SE (EMI SE//) values of the thermally conductive Ti3C2Tx/(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)為基體,石墨納米微片(GNPs)為導熱填料,采用熔融沉積成型(FDM)3D打印技術(shù)制備GNPs有序排列的GNPs/PLA(o-GNPs/PLA)片材,與真空輔助抽濾法制備的導電Ti3C2Tx薄膜復合,經(jīng)“層層鋪疊-熱壓”工藝制備Ti3C2Tx/(o-GNPs/PLA)導熱電磁屏蔽復合材料。當GNPs質(zhì)量分數(shù)為20 wt%時,o-GNPs/PLA導熱復合材料具有最佳的綜合性能,其拉伸強度、熔體體積流動速率和面內(nèi)熱導率(λ//)分別為47.5 MPa、13 cm3/(10 min)和2.90 W/(m·K),是相同GNPs用量下共混熱壓制備r-GNPs/PLA導熱復合材料λ//(1.82 W/(m·K))的1.6倍。引入4層Ti3C2Tx(6.98 wt%)薄膜后,Ti3C2Tx/(o-GNPs/PLA)導熱電磁屏蔽復合材料的λ//和面內(nèi)電磁屏蔽效能(EMI SE//)快速提升至3.44 W/(m·K)和65 dB(3.00 mm),較純PLA的λ//(0.26 W/(m·K))和EMI SE//(3 dB)分別提升了1223.1%和2066.7%。
論文創(chuàng)新點
1. 采用3D打印技術(shù)成功實現(xiàn)了GNPs的有序排列,顯著提高了有序排列GNPs/PLA(o-GNPs/PLA)導熱復合材料的面內(nèi)導熱系數(shù)(λ//);
2.將o-GNPs/PLA與Ti3C2Tx薄膜優(yōu)化復合,經(jīng)“層層鋪疊-熱壓”工藝實現(xiàn)了Ti3C2Tx/(o-GNPs/PLA)復合材料的高導熱和優(yōu)異的電磁屏蔽性能。