Synthesis of per-fluorinated polymer-alloy based on PTFE by high temperature EB-irradiation

Improved thermal stability of crosslinked PTFE using fluorine gas treatment

“…Thermal stability can also be evaluated by using heat-ofcrystallization (DH c ) values [3,18,19]. Larger DH c values in samples imply better thermal stability.…”

“…Fig. 4 shows the relationship between reaction temperature and heat of crystallization (DH c ) for samples (~) treated at 51 kPa F 2 for 24 h. The heat of crystallization [18,[21][22][23] was determined from the exothermic peak area at crystallization temperature (T c ) in DSC profiles. The DH c values for samples (~) are scattered as shown in Fig.…”

“…This fact suggests that the thermal stability of PTFE modified by radiation is reduced in comparison to that of original PTFE. Both the melting point and decomposition point of XF were lower than those of original PTFE [18], probably because of the decrease of the crystal size that occurs by the chain-scission. This study shows that C C lowers the thermal stability as it is converted into saturated bonds through fluorination.…”

Evaluation of PEFC Membrane based on Cross-linked PTFE by EB Grafting: Effect of Thickness for FC Performance

“…The three thicknesses of thin PTFE membranes were prepared by wire-bar coater at atmospheric circumstances (wire-bar No. 9,12,16, coating speed: 16 mm/s, drying time by Halogen heater: 30 s), and were subjected to heat treatment at 80 C for 20 h and 150 C for 24 h. After sintering treatment, cross-linked PTFE (RX PTFE) membranes, and PTFE film (Naflon ® tape, NICHIAS) with the thickness of 50μm, which was used for comparison, were fabricated by EB (CURETRON ® , acceleration voltage: 200 kV, current: 1 mA, installed at RISE, Waseda University, NHV Corp.) irradiation under the nitrogen atmosphere at 335±5 C [9][10][11]. The irradiated RX PTFEs were grafted with styrene by EB irradiation at 15 kGy in the nitrogen atmosphere at room temperature (EB grafting method).…”

Study on chemical structures of poly (tetrafluoroethylene-co-perfluoroalkylvinylether) by soft-EB irradiation in solid and molten state

“…For example, the crosslinked PTFE shows the high transparency due to low crystallinity, low gas transmittance, high radiation durability, and so on. Moreover, chemical structure and reaction mechanism of crosslinked PTFE have been studied by using solid-state 19 F magic angle spinning (MAS) nuclear magnetic resonance (NMR) [4,[6][7][8], electron spin resonance (ESR) [9,10] and Fourier transform infrared spectroscopy (FT-IR), and so on [6,[8][9][10].…”