Finely tuned polyamide structure with green plasticizers to
Green plasticizer-assisted IP was developed to fabricate polyamide layer. Newly formed hydrogen bonds increased chain flexibility. Increased chain mobility greatly facilitated water transport efficiency. This preparation method kept the green nature of RO membranes. Abstract
New insights into tailoring polyamide structure
In summary, highly permeable TFC RO membranes were successfully fabricated via plasticizer-assisted interfacial polymerization on the PSF substrate membranes. Three typical phthalate ester plasticizers, including DMP, DBP, and DOP, were added into the organic phase during the IP process to generate the flexible aromatic polyamide layer.
Interface-assisted synthesis: a gateway to effective
For example, chemical vapor deposition (CVD) 52,53 is a classic example for a G/S-assisted interfacial polymerization, in which a metal or carbon offers a hard 2-D template for the adsorption, nucleation, arrangement and polymerization of corresponding precursors or intermediates (carbon radicals from CH 4 for graphene synthesis). Thus, the
Hydrogel assisted interfacial polymerization for advanced
Here, an innovative approach to design thin film composite (TFC) membranes with ultrahigh permeance via hydrogel assisted interfacial polymerization is reported. The hydrogel containing piperazine (PIP) monomers serving as an aqueous phase in interfacial polymerization enable homogeneous interfacial polymerization, reducing the diffusion rate
Cosolvent-Assisted Interfacial Polymerization toward
Cosolvent-assisted interfacial polymerization (IP) can effectively enhance the separation performance of thin film composite (TFC) reverse osmosis (RO) membranes. However, the underlying mechanisms regulating the formation of their polyamide (PA) rejection films remain controversial. The current study reveals two essential roles of cosolvents in the IP reaction: (1) directly promoting
- Can plasticizer-assisted interfacial polymerization be used to prepare advanced TFC RO membranes?
- Membranes prepared via PAIP present excellent water permeability, and their salt rejection is acceptable in comparison with other RO membranes. Consequently, it can be concluded that plasticizer-assisted interfacial polymerization can be harnessed to prepare advanced TFC RO membranes.
- How does plasticizer-assisted interfacial polymerization improve polyamide chain flexibility?
- Plasticizer-assisted interfacial polymerization was developed to prepare RO membranes. Polyamide chain flexibility improved substantially in the presence of plasticizer. Disruption of inter chain hydrogen bonding caused enhancement of chain flexibility. Water flux enhanced due to more efficient transport channels for water molecules.
- What is plasticizer-assisted interfacial polymerization (Paip) of m-phenylenediamine?
- Herein, we developed plasticizer-assisted interfacial polymerization (PAIP) of m -phenylenediamine (MPD) and trimesoyl chloride (TMC) for fabricating advanced TFC RO membranes (see Fig. 1 (A) ). The plasticizer utilized in this work was diethyl phthalate (DEP).
- Do plasticizers promote membrane permeability?
- After the introduction of different plasticizers, there appears a marked increase in the number of voids in the polyamide layer, suggesting the generation of fast permeating channels for water molecules, which is expected to promote membrane permeability to a great extent.
- Does a plasticizer soften a polyamide film?
- On the other hand, the plasticizer ATBC softens the polyamide film as confirmed by the reduced Young’s modulus. This could enhance the flexibility of polymer chains and promote the transportation of water molecule.
- Can surfactant-interlayer assisted interfacial polymerization transform ordinary NF membranes into Janus membranes?
- Herein, we developed a surfactant-interlayer assisted interfacial polymerization (SIAIP) strategy to transform ordinary NF membranes into Janus NF membranes with dual-electrical properties (Fig. 1). The diffusion behavior of amine monomers was altered by sodium dodecyl sulfate (SDS), producing a dense PA active layer.
