Other Copolymers

Other Copolymers

Alfa Chemistry Fluoropolymers also provides customers with some other fluoropolymers, such as：

• Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)
• Poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene]

PVDF-HFP

Structure

Research Applications

• Through solvent evaporation casting technology, PVDF-HFP as the base polymer can be prepared into polymer-encapsulated membrane (PIM) for applications in thiocyanate extraction. The common base polymers used to make PIM are poly(vinyl chloride) (PVC) and cellulose triacetate (CTA). Their role is to hold the extractant (usually called the carrier) and other membrane components, for example as its entanglement Plasticizers and/or modifiers in the polymer chain and provide mechanical strength to the film. PIM based on PVDF-HFP showed significantly higher extraction and de-extraction rate than PVC-based PIM, and showed good stability in repeated extraction/de-extraction cycles. Because of its low glass transition temperature PVDF-HFP exists in a rubbery state at room temperature, no plasticizer is needed in the membrane composition to achieve relatively high membrane permeability.

Figure 1. Comparison of the percentage of extraction efficiency for each of the multiple extraction experiments [1]

• PVDF-HFP can be used as a substrate to prepare sodium ion conductive gel polymer electrolyte nanocomposites for sodium-sulfur batteries. The gel nanocomposite material is obtained in the form of a dimensionally stable, transparent and independent thick film, and has flexibility, independence and transparency and excellent dimensional/mechanical stability.

Figure 2. A typical photo of the gel polymer electrolyte nanocomposite membrane EC-PC-NaCF₃SO₃-(PVDF-HFP) dispersed with SiO₂ [2]

Poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene]

Structure

Research Applications

• Poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-tetrafluoroethylene] can be prepared for ionophore-based ion selective potentiometry fluoropolymer membrane, which is used as an electrode for pH measurement. Fluorous media are known as the least polar and polarizable condensed phases, whose usage as membrane materials greatly improves the selectivity and stability of ion selective electrodes (ISE). [3]
• The microfluidic architecture used for lab-on-a-chip applications is usually made of polydimethylsiloxane (PDMS), which is a polymer material that is easy to use, cheap, and widely compatible with biological materials, but is stable to organic solvents The sex is low. Because fluoropolymer has excellent chemical inertness, it can be used as a film to cover the channel wall to increase its chemical resistance. Studies have shown that coatings prepared by poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-tetrafluoroethylene] can reduce the effect of PDMS on the permeability to liquid or gas and delay the adsorption process of chemical substances that act on the surface wettability.

Figure 3. Functionalization scheme of PDMS samples. (c) Use poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxolane-co-tetrafluoroethylene] to produce PDMStf samples. [4]

References

1. Yukie O'Bryan, Robert W. Cattrall, Yen B. Truong, Ilias L. Kyratzis, Spas D. Kolev, Journal of Membrane Science 510 (2016) 481-488.
2. Deepak Kumar, Mohd. Suleman, S.A. Hashmi, Solid State Ionics 202 (2011) 45–53.
3. Chun-Ze Lai, Secil S. Koseoglu, Elizabeth C. Lugert, Paul G. Boswell, József Rábai, Timothy P. Lodge, and Philippe Bühlmann, Journal of the American Chemical Society 131 (2009) 1598–1606.
4. Valentina Arima, Monica Bianco, Antonella Zacheo, Alessandra Zizzari, Elisabetta Perrone, Lucia Marra, Ross Rinaldi, Thin Solid Films 520 (2012) 2293–2300.

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