Programming molecular switches in water and ethanol via thermo-sensitive polymers for phase control in energetic crystals
Xinru Yang 1Yushi Wen 1Congmei Lin 1Feiyan Gong 1Zhijian Yang 1Fude Nie1
扫码查看
点击上方二维码区域，可以放大扫码查看
作者信息
1. Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China
折叠
Abstract
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.
Key words
2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane(CL-20)/Phase stability/Polydopamine(PDA)/Poly-N-Isopropylacrylamide(PNIPAM)/Thermal and solvent effects
引用本文复制引用
基金项目
National Natural Science Foundation of China(U2130207)
National Natural Science Foundation of China(21875232)
National Natural Science Foundation of China(12372342)
Foundation of President of China Academy of Engineering Physics(YZJJZQ2023008)
Foundation of President of China Academy of Engineering Physics(YZJJZQ2022006)
Foundation of China Academy of Engineering Physics(CX20210015)
Foundation of China Academy of Engineering Physics(CX20210027)
维普
万方数据