中北大学武碧栋团队报道了粘结剂在反应性复合材料中的作用：以球形B/Pb₃O₄颗粒为例。相关研究成果于2024年7月2日发表在《颗粒学报》。

战略性地选择适当的制备方法和粘合剂策略对于提高烟火延迟组合物（PDCs）的颗粒和燃烧性能至关重要。

该研究利用液滴微流体技术（DMT）和微米级原料，制备了不同浓度氟橡胶（F2604）的球形B/Pb₃O₄复合颗粒。对这些微球的形态、比表面积、体积密度、流动性、摩擦敏感性、热分解和燃烧性能进行了表征。结果表明，随着粘结剂含量的增加，微球的粒径先减小后增大，比表面积减小，堆积密度增大，这与粘结剂对反应物粉末的结合更加紧密有关。此外，更紧密的粉末间结合导致样品的热分解峰值温度逐渐降低（从404.2°C降至346.4°C）。

此外，增加的粘合剂含量降低了样品的摩擦敏感性和燃烧速率，这归因于粘合剂的能量吸收特性。与对照组相比，微球样品表现出显著增强的体积密度、流动性、摩擦安全性和燃烧延迟精度，有可能提高PDCs在点火序列中的可靠性。

附：英文原文

Title: Role of binders in reactive composites: A case study with spherical B/Pb3O4 particles

Author: Bidong Wu

Issue&Volume: 2024/07/02

Abstract: The strategic selection of appropriate preparation methods and binder strategies is crucial for enhancing the particle and combustion performance of pyrotechnic delay compositions (PDCs). This study, utilizing droplet microfluidics technology (DMT) and micron-scale raw materials, prepared spherical B/Pb3O4 composite particles with varying concentrations of fluorine rubber (F2604). The morphology, specific surface area, bulk density, flowability, friction sensitivity, thermal decomposition, and combustion performance of these microspheres were characterized. The results indicate that as the binder content increases, the particle size of the microspheres first decreases and then increases, the specific surface area decreases, and the bulk density increases, correlating with tighter binding of the reactant powders by the binder. Furthermore, tighter powder-to-powder binding results in a progressive decrease in the thermal decomposition peak temperature of the samples (from 404.2 °C to 346.4 °C). Additionally, increased binder content reduces the friction sensitivity and combustion rate of the samples, which is attributed to the energy absorption properties of the binder. Compared to the control group, the microsphere samples exhibit significantly enhanced bulk density, flowability, friction safety, and combustion delay precision, potentially improving the reliability of PDCs in ignition sequences.

DOI: 10.1016/j.partic.2024.06.011

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124001214