Factors Affecting the Size of Aqueous Poly(vinylphenol-<i>co</i>-potassium styrenesulfonate)/Poly(ethylene oxide) Complexes

Cong, Rongjuan; Pelton, Robert; Russo, Paul S.; Doucet, G. J.

doi:10.1021/ma020965y

Cited by 19 publications

(18 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be further confirmed by 13 C NMR spectroscopy. Compared with literature reports, the carbon signals of the aldehyde group ( h , Figure c) and the phenolic hydroxyl group ( g , Figure c) have shifted, indicating that the carbonyl group in the PNVF side groups could form a hydrogen bond with the phenolic hydroxyl group in BPA.…”

Section: Resultscontrasting

confidence: 62%

Ultrahigh Flux and Strong Affinity Poly(N-vinylformamide)-Grafted Polypropylene Membranes for Continuous Removal of Organic Micropollutants from Water

Gui

Ouyang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The rapid and effective removal of organic micropollutants (OMPs) from water remains a huge challenge for traditional water treatment techniques. Compared with powder adsorbents such as polymers and nanomaterials, the free-standing adsorptive membrane is possible for large-scale applications and shows promise in removing OMPs. Herein, inspired by aquatic plants, a novel free-standing adsorptive membrane (NPPM) with high water flux, strong adsorption affinity, and excellent reproducibility was prepared by one-step UV surface grafting. N-Vinylformamide (NVF) was employed to introduce multiple hydrophilic and hydrogen bonding sites on the surface of commercial polypropylene fiber membranes (PPM). The NPPM exhibits excellent water permeability and ultrahigh water flux (up to 40 000 L/(m 2 h)) and could continuously remove a broad spectrum of OMPs from water. Its adsorption performance is 5−100 times higher than that of PPM and commercial membranes. Even in natural water sources such as tap water and river water, the NPPM shows unchanged adsorption performance and high OMPs removal efficiency (>95%). Notably, the NPPM has excellent regeneration performance and can be regenerated by hot water elution, which provides an environmentally friendly regeneration method without involving any organic solvent. Moreover, the synergy between hydrogen bonding and hydrophobic interaction is revealed, and the hydrophobic interaction provided by the hydrophobic substrate is proved to play a fundamental role in OMPs adsorption. The strong hydrogen bonds between the grafts and the OMPs are demonstrated by variable-temperature FTIR spectroscopy (vt-FTIR), 13 C nuclear magnetic resonance spectroscopy ( 13 C NMR), and simulation calculations. The strong hydrogen bonds could increase the enthalpy change and enhance the adsorption affinity, so the NPPM has a strong adsorption affinity, which is 100 times that of similar adsorption membranes. This study not only presents an adsorptive membrane with great commercial potential in the rapid remediation of a water source but also opens a pathway to develop an adsorptive membrane with high water flux and strong adsorption affinity.

show abstract

Section: Resultscontrasting

confidence: 62%

Ultrahigh Flux and Strong Affinity Poly(N-vinylformamide)-Grafted Polypropylene Membranes for Continuous Removal of Organic Micropollutants from Water

Gui

Ouyang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…It is known that phenolic hydroxyl groups of lignin and ether oxygen of PEO in alkaline solutions create an association induced complex formation . This strong interaction suggests a promising system for electrospinning of lignin in aqueous solutions with a low percentage of binder polymer.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of aqueous lignin/poly(ethylene oxide) complexes

Poursorkhabi

Mohanty

Misra

2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

Microfibers of kraft lignin blended with poly(ethylene oxide) (PEO) were produced by electrospinning of the solution of lignin and high molecular weight poly(ethylene oxide) (PEO) in alkaline water. Interactions between lignin and PEO in alkaline aqueous solutions create association complexes, which increases the viscosity of the solution. The effect of polymer concentration, PEO molecular weight, and storage time of solution before spinning on the morphology of the fibers was studied. It showed that after one day the viscosity dropped and fiber diameter decreased. Results from the solutions in alkaline water and N,N-dimethylformamide (DMF) with different polymer concentrations were compared. The 7 wt % of (Lignin/PEO: 95/5 wt/wt) in alkaline aqueous solution was successfully spun and the ratio of PEO in lignin/PEO mixture could be further reduced. In comparison, higher concentrations were needed to prepare a spinning solution in DMF and fiber diameters were in a much smaller range. The final target of spinning lignin is to produce carbonized fibers. Fibers spun from aqueous solutions had lower PEO content, which is a big advantage for the carbonization process as it reduces the challenges regarding melting of the fibers or void creation during carbonization. Furthermore, the larger diameter of these fibers inhibits disintegration of the carbonized fibers, which happens due to the mass loss during the process.

show abstract

“…4-Vinylphenols are natural products widely distributed in plants. − They are also employed in many industrial applications, for instance as flavoring substances in perfumery and as building blocks for the preparation of bioactive compounds and polymers. , There is, thus, an increasing demand for such functionalized styrenes, and the design of synthetic strategies to afford them becomes an important task.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of the Organocatalyzed Decarboxylative Knoevenagel−Doebner Reaction. A Theoretical Study

Bermúdez¹,

Ventura²,

Saenz‐Méndez³

2010

J. Phys. Chem. A

View full text Add to dashboard Cite

We have investigated important intermediates and key transition states of the organocatalyzed Knoevenagel condensation using density functional theory and two different basis sets (6-31 G(d,p) and 6-311++G(2df,2pd)), both in gas phase and simulating the bulk solvent (pyridine) using the PCM method. Calculated structures for reactants, intermediates, and key transition states suggest that the secondary amine catalyst is essential, both for activating the aldehyde for nucleophilic attack, and in the possible decarboxylation pathways. The calculated results are shown to agree with available experimental information. On the basis of the results obtained, the studied mechanism may be important in the understanding of vinylphenol production during malting and brewing of wheat and barley grains.

show abstract

Factors Affecting the Size of Aqueous Poly(vinylphenol-co-potassium styrenesulfonate)/Poly(ethylene oxide) Complexes

Cited by 19 publications

References 24 publications

Ultrahigh Flux and Strong Affinity Poly(N-vinylformamide)-Grafted Polypropylene Membranes for Continuous Removal of Organic Micropollutants from Water

Ultrahigh Flux and Strong Affinity Poly(N-vinylformamide)-Grafted Polypropylene Membranes for Continuous Removal of Organic Micropollutants from Water

Electrospinning of aqueous lignin/poly(ethylene oxide) complexes

Mechanism of the Organocatalyzed Decarboxylative Knoevenagel−Doebner Reaction. A Theoretical Study

Contact Info

Product

Resources

About