Programming molecular switches in water and ethanol via thermo-sensitive polymers for phase control in energetic crystals

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外文摘要：The practical application of energetic materials,particularly 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane(CL-20),is frequently impeded by phase transition challenges.In this study,we propose a novel strategy to enhance the stability of CL-20 by employing a thermo-sensitive polymer,poly(N-isopropylacrylamide)(PNIPAM),to modulate its phase transitions.Our approach involves the use of an in-situ polymerized polydopamine(PDA)shell as a platform for surface grafting through atom transfer radical polymerization,yielding a core-shell structured CL-20@PDA-PNIPAM.Through comprehensive characterization,the successful grafting of PNIPAM is confirmed,significantly enhanced the phase stability of CL-20.Notably,our core-shell structure exhibits a 13 ℃ increase in phase transition temperature compared to raw CL-20,thereby delaying the ε→α phase transition by over 80 min under combined thermal and solvent conditions.The enhanced stability is attributed to the hydrophobic nature of PNIPAM above its low critical solution temperature in water,which effectively shields the CL-20 crystal.These findings provide new insights into enhancing the stability and safety of energetic mate-rials in complex environments,highlighting the potential of our molecular switch mechanism.

外文关键词：

2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane(CL-20)Phase stabilityPolydopamine(PDA)Poly-N-Isopropylacrylamide(PNIPAM)Thermal and solvent effects

作者：

Xinru Yang、Yushi Wen、Congmei Lin、Feiyan Gong、Zhijian Yang、Fude Nie

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作者单位：

Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFoundation of President of China Academy of Engineering PhysicsFoundation of President of China Academy of Engineering PhysicsFoundation of China Academy of Engineering PhysicsFoundation of China Academy of Engineering Physics

项目编号：

U21302072187523212372342YZJJZQ2023008YZJJZQ2022006CX20210015CX20210027

出版年：

2024

DOI：

10.1016/j.dt.2024.03.009

防务技术

中国兵工学会

防务技术

CSTPCD

影响因子：0.358

ISSN：2214-9147

年,卷(期)：2024.38(8)