Multifunctional Fluorine-Rich Ion-Conductive Elastomer for Combustion-Enhanced Energetic Composites

IF 5.2 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Polymer Materials Pub Date : 2026-10-09 Epub Date: 2026-09-29 DOI:10.1021/acsapm.6c03181

Hongxia Zhang, Xiaohong Yan, Jiechao Wang, Shimin Zhang, Xiaoying Cheng, Fan Liao, Chongwei An

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Abstract

Achieving a balanced combination of ultra-stretchability, electrostatic safety, self-healing capability, and enhanced combustion performance in polymer-bonded explosives (PBXs) remains a critical challenge. Herein, we report a series of fluorine-rich ion-conductive elastomers (ICEs) derived from a polymerizable deep eutectic solvent (PDES) composed of 2,2,3,4,4,4-hexafluorobutyl acrylate (HFBA) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The formation mechanism of the PDES(HFBA₂-LiTFSI) system was elucidated via FT-IR spectroscopy, revealing that the carbonyl groups of HFBA participate in Li⁺ solvation, and a homogeneous PDES is formed at an HFBA:LiTFSI molar ratio of 2:1. Three elastomer systems, namely LiF₂C_No, LiF₂C_PEGDA and LiF₂C_VFSoil were systematically investigated. By introducing a fluorosiloxane crosslinker (VFSoil), the resulting LiF₂C_VFSoil exhibited the most favorable comprehensive performance with toughness of 23.23±0.05 MJ·m^–3, ionic conductivity of 7.517×10^–5 S/m, thermally activated self-healing capability, and favorable hydrophobicity. When applied as a binder for cyclotetramethylenetetranitramine (HMX, octogen)-based composites, the H₅₀(LiF₂C_VFSoil)₅₀ formulation maintained excellent stretchability with an elongation at break of 578.12% and exhibited thermally activated self-healing capability at 80 °C. Furthermore, the H₉₀(LiF₂C_VFSoil)₁₀ formulation improved both the mechanical and electrostatic safety relative to pristine HMX. Moreover, high-speed photography and infrared thermography revealed that the fluorine-rich binder LiF₂C_VFSoil effectively disrupted the alumina passivation shell, suppressed aluminum nanoparticles (nano-Al) agglomeration, and delivered superior combustion uniformity and sustained high flame temperatures in aluminized formulations. This work presents a promising molecular design platform for developing next-generation PBXs featuring ultra-stretchability, thermally activated self-healing capability, and enhanced combustion performance.

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燃烧增强高能复合材料的多功能富氟离子导电弹性体

在聚合物粘合炸药（pbx）中实现超拉伸性、静电安全性、自愈能力和增强燃烧性能的平衡组合仍然是一个关键的挑战。本文报道了一系列富氟离子导电弹性体（ICEs），这些弹性体是由2,2,3,4,4,4-六氟丙烯酸丁酯（HFBA）和二（三氟甲烷磺酰）亚胺锂（LiTFSI）组成的可聚合深度共晶溶剂（PDES）衍生而来。通过FT-IR光谱分析了PDES（HFBA2-LiTFSI）体系的形成机理，发现HFBA的羰基参与Li+溶剂化，在HFBA:LiTFSI摩尔比为2:1的条件下形成了均质PDES。对三种弹性体体系LiF2CNo、LiF2CPEGDA和LiF2CVFSoil进行了系统的研究。通过引入氟硅氧烷交联剂（VFSoil），得到的LiF2CVFSoil综合性能最佳，韧性为23.23±0.05MJ·m - 3，离子电导率为7.517×10-5 S/m，具有热激活自愈能力，且具有良好的疏水性。将H50(LiF2CVFSoil)50作为环四亚胺（HMX, octogen）基复合材料的粘合剂时，H50(LiF2CVFSoil)50配方保持了良好的拉伸性能，断裂伸长率为578.12%，并在80℃时表现出热激活的自修复能力。此外，与原始HMX相比，H90(LiF2CVFSoil)10配方提高了机械和静电安全性。此外，高速摄影和红外热成像显示，富氟粘合剂LiF2CVFSoil有效地破坏了氧化铝钝化壳，抑制了铝纳米颗粒（纳米al）的团聚，并在铝化配方中提供了卓越的燃烧均匀性和持续的高温。这项工作为开发下一代pbx提供了一个有前途的分子设计平台，该平台具有超拉伸性、热激活自修复能力和增强的燃烧性能。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.