Study on polytetrafluoroethylene aqueous dispersion irradiated by gamma ray

Investigation on the properties of gamma irradiated of polytetrafluoroethylene fibers

“…The XRD analysis shows slight increase in the intensity of XRD peaks with the increasing of gamma irradiation doses up to a dose 25 kGy, indicating the improvement in the PTFE fiber crystallinity with gamma irradiation. The increase in PTFE crystallinity by irradiation was previously observed in different studies (Briskman & Tlebaev, ; Su, Wu, Liu, & Zeng, ; Takenaga & Yamagata, ). The increased crystallinity with irradiation could be explained by increasing crosslinking upon certain irradiation doses.…”

“…Also, a radiation chain scission could occur and causes mobility of the formed molecular fragments from PTFE. This could result in a relief of residual stress in the amorphous region and the probability of entanglement per molecule decreases, forming additionally small crystallites (Briskman & Tlebaev, ; Su et al, ; Takenaga & Yamagata, ).…”

Electrospun porous poly(tetrafluoroethylene-co-hexafluoropropylene-co-vinylidene fluoride) membranes for membrane distillation

“…PVDF exhibited distinct characteristic peaks assigned to -CH 2 bending (1400 cm À1 ), -CF 2 stretching (1169 cm À1 ), and amorphous phase absorption (876 and 839 cm À1 ). 35 PTFE had characteristic peaks that were attributed to the -CF 2 asymmetrical (1202 cm À1 ) and symmetrical (1147 cm À1 ) stretching modes, 36 whereas PVDF-HFP showed a broad band at around 1068 cm À1 , assigned to the -CF 2 and -CF 3 stretching absorptions. 37 THV was expected to show all the characteristic peaks of these three polymers as it contained the three kinds of chain segments.…”

Surface structural changes, surface energy and antiwear properties of polytetrafluoroethylene induced by proton irradiation

“…3 presents the changes of ATR-FTIR spectra as a function of proton irradiation time of the PTFE. The major characteristic bands at 1205 cm − 1 and 1148 cm − 1 are primarily corresponding to CF 2 symmetrical and asymmetrical stretching bands [31,32], respectively. With increasing of the exposure time, the intensity of these characteristic bands of PTFE at 1205 cm −1 and 1148 cm −1 decreased significantly.…”