Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. III. Thermal and mechanical properties of the membranes and their sulfonated derivatives

Phadnis, Swati; Patri, M.; Chandrasekhar, L.; Deb, Pritam

doi:10.1002/app.21349

Cited by 3 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the peak reductions at 700 and 1499 cm −1 evidence the weakening of polystrene moiety. The high frequency side of the peak 700 cm −1 appears new shoulder peak after sulfonation, which coincides with the results of Phadnis' et al . St and AA monomers are cografted and thus may generate alternating polymer chains onto PP fabrics.…”

Section: Resultssupporting

confidence: 90%

“…In this case, the neighboring propyl acid reacts with benzene ring to form cyclic acylation under catalysis of concentrated sulfuric acid, with ring compound containing carbonyl group being produced. The formation of carbonyl group prior to sulfonation can be explained by acylation under heating, since the thermal grafting took place even at 130 °C for 20 min, only acylation reaction happens more violently by catalysis of sulfuric acid than heating. Acylation alters monosubstituted to bisubstituted benzenes or heterogeneous ring compounds, as indicated by the peak change of 1499 and 700 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and sulfonation of dual monomer‐grafted polypropylene nonwoven fabrics

Tao

Pang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

The sulfonation of styrenic polymers often needs harsh reaction conditions, such as concentrated sulfuric acid and elevated temperature. The awkward situation is handled by grafting copolymerization of polar and nonpolar monomers, and essentially the surface wettability between sulfonating agent and matrix polymer is circumvented in the study. Two pairs of dual monomers, glycidyl methacrylate (GMA)-acrylic acid (AA), styrene (St)-acrylic acid (AA), were grafted onto polypropylene nonwoven fabrics (PP) using thermal polymerization, and the resulted fabrics were further sulfonated using sodium sulfite and sulfuric acid, respectively. The microstructure of the modified fabrics was characterized by infrared spectroscopy and scanning electron microscopy. The ion exchange property was verified by copper (II) removal from aqueous solution, and its reutilization was carried out in electrochemical desorption process. The results show that hydrophilic and active monomer AA speeds grafting and sulfonation, but overload of AA will deteriorate copolymerization of GMA, and switch copolymerization chain component due to acylation with benzene ring. Although interfacial compatilizer promotes dual grafting, its overdosing may intensify microphase segregation of the grafting polymers owing to emulsification. The resultant granular polymers will be drained off during functionalization and reutilization processes. The ion exchange fabrics can be applied for treatment of metal ion wastewaters with unique electrochemical desorption feature.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Microstructure and sulfonation of dual monomer‐grafted polypropylene nonwoven fabrics

Tao

Pang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

2010

View full text Add to dashboard Cite

A fundamental understanding of structure-morphology-property relationships of proton exchange membranes (PEMs) is crucial in order to improve the cost, performance, and durability of PEM fuel cells (PEMFCs). In this context, there has been an explosion over the past five years in the volume of research carried out in the area of non-perfluorinated, proton-conducting polymer membranes, with a particular emphasis on exploiting phase behavior associated with block and graft copolymers. This progress report highlights a selection of interesting studies in the area that have appeared since 2005, which illustrate the effects of factors such as acid and water contents and morphology upon proton conduction. It concludes with an outlook on future directions.

show abstract

Preparation of ion exchange membranes by radiation grafting of acrylic acid on FEP films

Gupta¹,

Muzyyan

Saxena³

et al. 2008

Radiation Physics and Chemistry

View full text Add to dashboard Cite

Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. III. Thermal and mechanical properties of the membranes and their sulfonated derivatives

Cited by 3 publications

References 19 publications

Microstructure and sulfonation of dual monomer‐grafted polypropylene nonwoven fabrics

Microstructure and sulfonation of dual monomer‐grafted polypropylene nonwoven fabrics

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

Preparation of ion exchange membranes by radiation grafting of acrylic acid on FEP films

Contact Info

Product

Resources

About