CNTs feature ultrahigh electrical conductivity and multiwall structure, contributing to the favorable interaction with microwaves, and accordingly evoke drastic energy conversion to the form of heat upon microwave irradiation. Herein, CNTs were ball milling assembled at the surface of expandable thermoplastic polyurethane/black phosphorus (e-TPU/BP) beads, where BP was used as a flame retardant, and served as the “interfacial sensitizer”, resulting in exceptional selective heating to inducing bubble formation in a continuous conductive network of TBC composite foams under the microwave field setting. The sinter-molded TBC composite foam possesses a high sensitivity of 550 kPa^–1 over 0–0.4 MPa of compressive stress with an ultralow CNT content of 0.5 wt %, stability of over 1000 cycles, and durability of 5000 s. Moreover, BP also provided excellent flame retardant and antidripping properties at 2 wt % loading. Therefore, by utilizing the intense response of CNTs to microwaves, a universal approach was developed not only for foam molding but also for the functionalization of thermoplastic materials.

中文翻译：

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微波诱导构建具有可调节压阻传感灵敏度的阻燃 TPU 泡沫


碳纳米管具有超高的导电性和多壁结构，有助于与微波的良好相互作用，从而在微波照射下引起剧烈的能量转化为热的形式。在此，通过球磨将碳纳米管组装在可膨胀热塑性聚氨酯/黑磷（e-TPU/BP）珠的表面，其中BP用作阻燃剂，并充当“界面敏化剂”，从而产生优异的选择性加热在微波场设置下，在 TBC 复合泡沫的连续导电网络中诱导气泡形成。烧结成型的 TBC 复合泡沫在 0-0.4 MPa 的压应力下具有 550 kPa ^–1 的高灵敏度，且 CNT 含量为 0.5 wt% 超低，稳定性超过 1000 次循环，耐久性为 5000 s 。此外，BP 在 2 wt% 的负载量下还具有优异的阻燃和抗滴落性能。因此，通过利用碳纳米管对微波的强烈响应，开发了一种通用方法，不仅适用于泡沫成型，而且适用于热塑性材料的功能化。