Modification of PTFE latex with P4VP/Surfactant complexes at nanoscale

Abstract

Polytetrafluoroethylene (PTFE) latex nanoparticles were subjected to modification with Poly (4‐vinylpyridine) (P4VP) by in situ seeded emulsion polymerization technique using regular [sodium dodecyl sulfate (SDS)] and fluorinated [Potassium heptadecafluoro‐1‐octanesulfonate (PFS)]surfactants. The as prepared PTFE‐ (P4VP/surfactant complex) composite latex nanoparticles were characterized for structure, morphology, and thermal properties and a comparison of particles obtained by PFS and SDS was done with different W/W ratios of PTFE and 4VP monomer. The composites have shown a multistep degradation pattern that may be attributed to the P4VP, surfactant and PTFE backbone degradation. Lowering of crystal–crystal transition temperature of PTFE and increase in the glass transition temperature of the P4VP/PFS or SDS complexes was noticed in all the composites suggesting a homogeneous modification. Thus, a simple and easy way to modify PTFE has been reported which could be subsequently complexed with metal salts such that stringent high energy pretreatment methods like plasma, ozone, or irradiation techniques could be avoided. POLYM. ENG. SCI., 55:499–505, 2015. © 2014 Society of Plastics Engineers

Morphological Control over ZnO Nanostructures from Self-Emulsion Polymerization

“…To further confirm whether solvent washing can remove all of the polymer to obtain pure ZnO, thermogravimetric analysis (TGA) of the representative sample VPZ-3 (as prepared and after solvent washing) was performed, as shown in Figure S6 in the Supporting Information. Major weight losses are observed in the range of ∼150–400 °C, which corresponds to the initial water loss up to 150 °C and then the structural decomposition of the polymer until 400 °C, as has previously been reported for P4VP by others. , A careful examination of the TGA thermograms indicates the presence of ∼39% ZnO. Almost no polymer was left, indicating that the solvent washing method for removing the polymer from the nanocomposites is a versatile, easy, and scalable way to obtain crystalline inorganic materials synthesized by SEP.…”

Modification of Cu‐PE‐PTFE composite coatings on rubber surface by low‐energy electron beam dispersion with glow discharge

“…The difference between them appears in the change of intensity and form of absorption bands. The absorption band at 1,100∼1,300 cm −1 , corresponded to the stretching vibration of CF 2 groups, broadens for PE‐PTFE composite coating compared to PTFE single coating . This may be related to the amorphous structure of PTFE in the composite coating .…”

“…All absorption band characteristics of PE and PTFE can also be observed in IR spectra of PE‐PTFE composite coating with discharge treatment. Compared to PTFE* single coating, the absorption band at 1,100–1,300 cm −1 broadens and the band at 600–660 cm −1 attributed to bending vibrations of CF 2 groups gets narrowing for composite coating . The D 1473 /D 1464 ratio for PE‐PTFE * coatings is larger than for PE * coating but is smaller than for PE‐PTFE coating (Table ), indicating the increase of crystallinity of composite coating under discharge treatment.…”