Molecular dynamics research on interfacial reinforcement between ε-CL-20 and polymeric bonding agents for humidity-insensitive solid propellant systems

Lei, D.; Fu, Yizheng; Hu, Wen; Li, Dong; He, Yi; Gan, Lihua; Gan, Lin; Huang, Jin

doi:10.1007/s10965-021-02571-5

Cited by 5 publications

(2 citation statements)

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“…24,25 Unlike the isocyanates curing system, the rigid triazole rings failed to induce the aggregation of hard segments to form a micro-phase separation structure, 26 due to insufficient intermolecular force. 27,28 Furthermore, the GAP-based triazole-cured binder system suffers from uncontrollable reaction equivalent because the molecular chain contains many CH 2 N 3 side groups, 29 and the preformed rigid triazoles had great spatial occupancy which hindered the formation of nearby triazoles. Notably, the excellent mechanical performance of the isocyanate curing system comes from its microphase separation structure.…”

Section: Introductionmentioning

confidence: 99%

“…However, the practical application of a triazole‐cured binder system is inhibited by unsatisfied mechanical properties 24,25 . Unlike the isocyanates curing system, the rigid triazole rings failed to induce the aggregation of hard segments to form a micro‐phase separation structure, 26 due to insufficient intermolecular force 27,28 . Furthermore, the GAP‐based triazole‐cured binder system suffers from uncontrollable reaction equivalent because the molecular chain contains many CH 2 N 3 side groups, 29 and the preformed rigid triazoles had great spatial occupancy which hindered the formation of nearby triazoles.…”

Section: Introductionmentioning

confidence: 99%

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Inserting urethane into 1,2,3‐triazole click‐cured solid propellant binder to form microphase separation and enhance mechanical and combustible performances

Zhang

Gan

et al. 2023

J of Applied Polymer Sci

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Huisgen‐click curing systems are widely used in solid propellant binders due to their low humidity sensitivity and mild reaction conditions. However, the rigid triazole rings from the Huisgen‐click reaction decrease the molecular moving ability and increase decomposition temperature, lowering the mechanical and combustion performance. Thus, we bonded the Huisgen‐click system and polyester binders with urethane, forming microphase separation and improving chemical stability. The results show that the elongation at break, tensile strength, and Young's modulus of the binders increase by 533.3%, 201.2%, and 1263.9%, respectively. Furthermore, the urethane reduces the thermal resistance index of the binders from 191.2 to 179.2°C, which means better combustion performance. Further mechanism study reveals that the urethane leads to microphase separation, which aggregates the hard segments and weakens their restriction effect on the molecular motion of polyether. Such a microphase separation brings comprehensive improvement in the mechanical properties of the solid propellants and probably can be used in other multi‐component systems of energetic materials.

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