Bioinspired hierarchical interface design for improved mechanical and safety properties in energetic polymer composites
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Bioinspired hierarchical interface design for improved mechanical and safety properties in energetic polymer composites Guansong He1,*, Xin Li1, Yueqiang Jiang1, Yu Dai1, Rong Xu1, Chengcheng Zeng1, Xiaoqing Tu2, and Zhijian Yang1,* 1 2
Institute of Chemical Materials, CAEP, Mianyang 621900, People’s Republic of China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621999, People’s Republic of China
Received: 4 June 2020
ABSTRACT
Accepted: 18 July 2020
Weak interfacial interaction and poor surface wettability always restrict and weaken the performances of energetic composites. Conventional surface modifications can hardly achieve a desired result, due to the inadequacy for solving the interfacial incompatibility. We here demonstrated bioinspired hierarchicalstructured 2,6-diamino-3,5-dinitropyrazine-1-oxide particles through in situ ‘‘grafting from’’ polymerization of hyperbranched polyurethane (HBPU) on polydopamine surface. Benefiting from the enhanced interfacial interaction and surface wettability which facilitated mechanical performance, the final results revealed that a remarkable mechanical enhancement was successfully achieved through this way. Meanwhile, improved safety performance was gained, and the impact sensitivity was reduced to a large extent which was ascribed to the cushioning and protective effects of HBPU shells with soft segments. We believe this approach of constructing bioinspired hierarchical interface aiming at solving low surface wettability and weak interface will shed light on the design and preparation of high-performance composites through a novel and effective way.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Dale Huber.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05130-3
J Mater Sci
GRAPHIC ABSTRACT
Introduction As typical energetic composites which mainly consist of high content explosives (86–96 wt%) and small amount of polymer matrix, polymer-bonded explosives (PBX) have been extensively used for military and civilian purposes [1–3]. And the detonation energy, safety and mechanical properties are three key parameters for final application of PBX [4–6]. Among them, the mechanical properties, including mechanical strength, toughness and creep resistances, have increasingly gained lots of attentions due to their critical contributions in maintaining the structural integrity and facilitating the improvements of reliability, safety and long-time storage stability [7]. However, the highly filled PBX actually exhibits a very low mechanical performance, especially when it comes to the extremely weak interfacial interactions between energetic crystals and polymer binder [8]. Until now, extensive works and techniques about improving the mechanical properties have been reported and completed, including polymer binder design [9, 10], explosive crystal embellishing [11, 12], nanofiller enhancing strategy [13] and so on. Howeve
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