《Table 4 Mechanical properties of the non-immersed OPU, FPU-1and CFPU-1 films at room temperature》

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《"Synthesis and Characterization of Fluorinated Polyurethane Containing Carborane in the Main Chain: Thermal, Mechanical and Chemical Resistance Properties"》

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In order to further verify the mechanical properties of CFPU-1 films in harsh environment，such as extremely high concentrations of acid-alkali corrosion and high temperature，the CFPU-1 films were immersed into organic solvent and acid solution（Jet aircraft oil and 37%HCl）and compared with FPU-1 and OPU films at the same time.The tensile strength and elongation at break were examined.The results are shown in Fig.14.Meanwhile，the tensile strength，elongation at break and Shore A hardness of the nonimmersed films at room temperature were also examined（Table 4）.With time increasing，the tensile strength of FPU-1，CFPU-1 and OPU films decreased gradually，and their elongation at break all increased.Nevertheless，the changes of the two mechanical parameters of fluorinated polyurethane films of FPU-1 and CFPU-1 are smaller than that of fluoride-free polyurethane（OPU）.It is worth noting that the cured CFPU-1 films have the highest tensile strength and the lowest of elongation at break among the three cured films，no matter whether or not these cured films were immersed into the media.The better mechanical property of CFPU-1 is attributed to the high rigidity of carborane in the main chain as illustrated in Fig.15.When CFPU-1 suffered external forces，the strong electron-deficiency of carborane made it more densified and compact.The steric effect of huge carborane cage caused the chain movement difficult，and the large size of the cage structure also had steric effect on the adjacent groups.It is obvious that the mechanical properties of FPU can be improved by introducing the carborane groups into the main chain of polyurethane in acid media.