Utilizing remarkable polymer matrix and efficient filler to propose an ingenious strategy for designing composite films synergistically with high electromagnetic interference shielding effectiveness (EMI SE) and thermal conductivity. Herein, a novel type of flexible composite film based on syndiotacticity-rich poly (vinyl alcohol) (sPVA)/modified MXene sediment (MS) is fabricated through an alternating casting approach. The sPVA/MS multilayered film containing effective noncovalent combining between sPVA layer and MS layer not only presents a high strength of ∼66.3 MPa but also possesses a superior electrical conductivity of 683 S/m. Notably, the MS layer with dense conductive and thermal networks endows the 95-μm-thick composite film with the synergy of favorable EMI SE (∼15.8 dB) in the X band and impressive in-plane thermal conductivity (3.31 W/mK, enhanced by ∼2365%). Moreover, this multilayered architecture realizes multiple internal reflection-absorption of microwaves and efficient heat dissipation, while confers the film with advantageable flame retardancy and significant water resistance. Therefore, sPVA-based composite films from MS provide a promising solution for the development of multifunctional polymeric materials tailored for upcoming electronic devices in challenging environments.

中文翻译：

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富含间同立构规整度的多功能聚（乙烯醇）/MXene沉积物用于具有有效电磁干扰屏蔽和导热性的多层复合薄膜

利用卓越的聚合物基体和高效填料，提出了一种巧妙的策略，协同设计具有高电磁干扰屏蔽效能（EMI SE）和导热性的复合薄膜。在此，通过交替浇铸方法制备了一种基于富含间同立构规整度的聚（乙烯醇）（sPVA）/改性MXene沉积物（MS）的新型柔性复合薄膜。sPVA/MS多层膜在sPVA层和MS层之间含有有效的非共价结合，不仅具有～66.3 MPa的高强度，而且还具有683 S/m的优异电导率。值得注意的是，具有致密传导和热网络的 MS 层赋予 95 μm 厚的复合薄膜在 X 波段具有良好的 EMI SE (∼15.8 dB) 和令人印象深刻的面内导热率 (3.31 W/mK，增强约 2365%）。此外，这种多层结构实现了微波的多次内反射吸收和高效散热，同时赋予薄膜良好的阻燃性和显着的耐水性。因此，MS 的基于 sPVA 的复合薄膜为开发多功能聚合物材料提供了一种有前途的解决方案，该材料专为即将推出的充满挑战的环境中的电子设备而设计。