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Electrospun fibers and matrices have been researched for their utility in various fields, however due to poor mechanical strength and loss of structural integrity, their commercial viability is limited. A near gel resin (nGR) of polystyrene (PS) was used in the present approach to fabricate crosslinked fibrous matrices of better mechanical strength and oil adsorption while retaining the structural integrity. Electrospinnability of nGR was assessed in bulk (i.e. in styrene monomer) and in solution (i.e. in dimethyl formamide) form with variation in formulation and electrospinning conditions. Ultimately, a uniform crosslinked fibrous matrix of PS was prepared using an oil-in-water emulsion, where the oil phase comprised of monomer (styrene), initiator (benzoyl peroxide) and crosslinker (divinylbenzene) was dispersed in a continuous phase of aqueous poly (vinyl alcohol) (PVA). The monomer conversion in oil phase was carried out below the gel point and the nGR of PS formed in dispersed droplets was electrospun to fabricate uniform fibrous matrices with help of template polymer i.e. PVA. Effect of various material and process parameters on gelation behavior, electrospinnability and fiber uniformity was studied and optimized to produce uniform core-sheath fibrous matrices of crosslinked PS. Post-electrospinning heat treatment of matrices was carried out to achieve complete monomer conversion and cross-linking. Fiber formation behavior of the emulsion was assessed using ionic and non-ionic surfactants. The crosslink density of the matrices was optimized to achieve desired structural morphology and dimensional stability. The process of fabrication of emulsion electrospun crosslinked fibers can further be extended to a variety of other monomers in order to enhance the suitability of fibrous matrices for many applications.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
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Tabular numerical representations of sequence motifs displaying their variability as likelihood values for each possible residue at each position in a sequence. Position-specific scoring matrices (PSSMs) are calculated from position frequency matrices.
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A disease of bone marked by thinning of the cortex and replacement of bone marrow by gritty fibrous tissue containing bony spicules, producing pain, disability, and gradually increasing deformity. Only one bone may be involved (FIBROUS DYSPLASIA, MONOSTOTIC) or several (FIBROUS DYSPLASIA, POLYOSTOTIC). (From Dorland, 28th ed)
Neoplasms composed of fibrous tissue, the ordinary connective tissue of the body, made up largely of yellow or white fibers. The concept does not refer to neoplasms located in fibrous tissue.