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Fabrication of polyurethane binders grafted with functional reactive plasticizers by a catalyst‐free click reaction
Author(s) -
Ma Mingyang,
Shen Yechen,
Kwon Younghwan
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190088
Subject(s) - plasticizer , norbornane , moiety , polymer chemistry , polyurethane , thermal stability , materials science , chemistry , chemical engineering , organic chemistry , engineering
The design of nonmigratory energetic plasticizers with low sensitivity and high performance is of great significance but challenging. Herein, two nonmigratory norbornane‐based reactive plasticizers (NRPs) are attached covalently to poly(glycidyl azide‐ co ‐tetrahydrofuran) (PGT)‐based polyurethanes (PUs), offering a reliable, self‐stable, and alternative energy source originating from ring strain, while mitigating the dangers to the environment by preventing migration. A binary mixture of PGT and NRPs is thermodynamically miscible up to 50/50 w/w. The catalyst‐free click reactivity of the NRPs toward PGT evaluated by the activation energy is verified by calculating the frontier molecular orbital energy levels. The absent weight loss of the pure NRPs evident from the measured thermal stability of the NRP/PGT‐based PU binders indicated that the NRPs react completely with the PGT matrix. The tensile properties of the PGT‐based PU binder by the inclusion of NRPs increased with increasing NRP content because of the increased number of triazole groups and the norbornane moiety. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 402–411