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(xué)類(lèi)期刊，中國(guó)科技期刊卓越行動(dòng)計(jì)劃-梯隊(duì)類(lèi)期刊項(xiàng)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(dǎo)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(dǎo)電Ti3C2Tx薄膜復(fù)合，經(jīng)“層層鋪疊-熱壓”工藝制備Ti3C2Tx/(o-GNPs/PLA)導(dǎo)熱電磁屏蔽復(fù)合材料。當(dāng)GNPs質(zhì)量分?jǐn)?shù)為20 wt%時(shí)，o-GNPs/PLA導(dǎo)熱復(fù)合材料具有最佳的綜合性能，其拉伸強(qiáng)度、熔體體積流動(dòng)速率和面內(nèi)熱導(dǎo)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(dǎo)熱復(fù)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(dǎo)熱電磁屏蔽復(fù)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(diǎn)
1. 采用3D打印技術(shù)成功實(shí)現(xiàn)了GNPs的有序排列，顯著提高了有序排列GNPs/PLA（o-GNPs/PLA）導(dǎo)熱復(fù)合材料的面內(nèi)導(dǎo)熱系數(shù)（λ//）；
2.將o-GNPs/PLA與Ti3C2Tx薄膜優(yōu)化復(fù)合，經(jīng)“層層鋪疊-熱壓”工藝實(shí)現(xiàn)了Ti3C2Tx/(o-GNPs/PLA)復(fù)合材料的高導(dǎo)熱和優(yōu)異的電磁屏蔽性能。