Study on the Curing System of Polytriazole Adhesive for Composite Solid Propellant

Polyether/polyester with terminal alkynyl groups, bis‐alkynyl chain extender (BEBA), tri‐alkynyl crosslinking agent (TMPTPE) and bis‐azide curing agent (BPDBA) were synthesized to prepare a series of polytriazole elastomers. The effects of factors including curing parameters (Rt), hard segment content (H%), and crosslinking agent content (C%) on the mechanical properties of cured films were investigated. And the crosslinking network of polytriazole elastomer was evaluated by swelling experiment. The compatibility and mechanical properties of polytriazole adhesive with plasticizer were also studied. The results showed that the tensile strength of the polytriazole adhesive and the elongation at break were changed from 0.71 MPa to 5.72 MPa, 300 % to 720 %, respectively. The polytriazole cross‐linked network structure was able to be well controlled by the loading of crosslinking agent. Moreover, the strong polar plasticizer was compatible with polytriazole adhesive and formed a high plasticizer elastomer.