Processing and structural properties of in situ polymerized poly(tetrafluoroethylene)/graphite fluoride composites

Abstract

FIG. 6. Polymerization mechanisms of FG/PTFE composites, (a) initial FG with linear defect, (b) onset of polymerization from linear defect near graphite particles surface, and (c) final morphology with graphite fragments distributed within the PTFE matrix.

Polytetrafluoroethylene (PTFE)/carbon black (CB) microporous membranes produced from PTFE/CB composite particles prepared by heterocoagulation process

“…[18][19][20] To improve the mechanical properties and other functional properties of PTFE membranes, various kinds of fillers, such as silicon carbide, silicon dioxide (SiO 2 ), zinc oxide, multiwalled carbon nanotube (MWCNT), and carbon black (CB), have been incorporated in the PTFE matrix to form composite materials. 1,[21][22][23] PTFE composite materials are generally prepared by simple dry blending or coating fillers with PTFE. 24 However, such methods lead to inhomogeneous distribution of fillers within PTFE and causes undesirable effect on the properties of PTFE composite membranes.…”

“…Under such conditions, it is hard to attain a completely uniform agglomeration of the composite particles. 21 In the current study, we prepared PTFE/CB composite particles by a simple heterocoagulation process where welldispersed CB dispersions were mixed with PTFE dispersions. Then the PTFE/CB composite particles were used to prepare PTFE/CB microporous membranes via mechanical stretching methods.…”