Liu Yan, Yao Ansheng, Fu Libi, Xie Shiwei, Zhang Yijie, Xu Peihui, Feng Yuezhan, Shi Yongqian
College of Environment and Safety Engineering, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, China.
College of Civil Engineering, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, China.
Molecules. 2024 Jun 29;29(13):3108. doi: 10.3390/molecules29133108.
Incorporating outstanding flame retardancy and electromagnetic interference shielding effectiveness (EMI SE) into polymers is a pressing requirement for practical utilization. In this study, we first employed the principles of microencapsulation and electrostatic interaction-driven self-assembly to encapsulate polyethyleneimine (PEI) molecules and TiCT nanosheets on the surface of ammonium polyphosphate (APP), forming a double-layer-encapsulated structure of ammonium polyphosphate (APP@PEI@TiCT). Subsequently, flame-retardant thermoplastic polyurethane (TPU) composites were fabricated by melting the flame-retardant agent with TPU. Afterwards, by using air-assisted thermocompression technology, we combined a reduced graphene oxide (rGO) film with flame-retardant TPU composites to fabricate hierarchical TPU/APP@PEI@TiCT/rGO composites. We systematically studied the combustion behavior, flame retardancy, and smoke-suppression performance of these composite materials, as well as the flame-retardant mechanism of the expansion system. The results indicated a significant improvement in the interface interaction between APP@PEI@TiCT and the TPU matrix. Compared to pure TPU, the TPU/10APP@PEI@1TC composite exhibited reductions of 84.1%, 43.2%, 62.4%, and 85.2% in peak heat release rate, total heat release, total smoke release, and total carbon dioxide yield, respectively. The averaged EMI SE of hierarchical TPU/5APP@PEI@1TC/rGO also reached 15.53 dB in the X-band.
将出色的阻燃性和电磁干扰屏蔽效能（EMI SE）融入聚合物是实际应用中的迫切需求。在本研究中，我们首先运用微胶囊化原理和静电相互作用驱动的自组装方法，将聚乙烯亚胺（PEI）分子和TiCT纳米片包覆在聚磷酸铵（APP）表面，形成聚磷酸铵的双层包覆结构（APP@PEI@TiCT）。随后，通过将阻燃剂与热塑性聚氨酯（TPU）熔融共混制备了阻燃TPU复合材料。之后，利用空气辅助热压技术，将还原氧化石墨烯（rGO）薄膜与阻燃TPU复合材料复合，制备了分级结构的TPU/APP@PEI@TiCT/rGO复合材料。我们系统地研究了这些复合材料的燃烧行为、阻燃性能和抑烟性能，以及膨胀体系的阻燃机理。结果表明，APP@PEI@TiCT与TPU基体之间的界面相互作用有显著改善。与纯TPU相比，TPU/10APP@PEI@1TC复合材料的热释放峰值速率、总热释放量、总烟释放量和总二氧化碳产量分别降低了84.1%、43.2%、62.4%和85.2%。分级结构的TPU/5APP@PEI@1TC/rGO在X波段的平均EMI SE也达到了15.53 dB。
