A new linear heptafluoro glycidyl ether binder: synthesis, characterization, and mechanical properties.

Fluorinated binders have currently received extensive attention in the research of binders due to their unique chemical properties. In this study, poly 2-(2,2,3,3,4,4,4-heptafluorobutoxymethyl) oxirane, i.e., poly(HFEE) was synthesized by a one-step substitution and cationic ring-opening polymerization using epichlorohydrin and 2,2,3,3,4,4,4-heptafluoro-1-butanol as raw materials. The corresponding characterization, such as FT-IR and NMR, of HFEE confirmed its successful synthesis. The differential scanning calorimetry (DSC) test shows that poly(HFEE) had a low glass transition temperature (T_g) of − 64.7 °C, indicating that it developed the better stability performance. At the same time, the thermal and mechanical properties of HFEE cured by polymethylene polyphenyl polyisocyanate (PAPI) were studied. The effects of curing temperature and PAPI content were investigated, and the corresponding rules were summarized. Thermogravimetric analysis (TGA-DTG) was utilized to evaluate the thermal stability of poly(HFEE) and the result showed that the sharp weight loss was at the temperature of 377 °C. This new strategy is devised for the utility of poly(HFEE) enabling it extension to be potential fluorinated binder for solid propellants. A new linear heptafluoro glycidyl ether poly 2-(2,2,3,3,4,4,4-heptafluorobutoxymethyl) oxirane (HFEE) was synthesized, characterized, and cured by polymethylene polyphenyl polyisocyanate (PAPI). The effects of curing temperature and PAPI content were investigated, and the corresponding rules were summarized. [ABSTRACT FROM AUTHOR]