Coiled Fibers of Poly (Amide-Co-Imide) PAI and Poly (Trimellitic Anhydride Chloride-Co-4, 4'-Methylene Dianiline) (PTACM) by using Mechano-Electrospinning

Abstract

Non-linear coil shaped uniform fibers were synthesized with the blend solution of Poly (amide-coimide) PAI (torlon)/Poly (trimellitic anhydride chloride-co-4, 4'-methylene dianiline) (PTACM) in solvent mixing ratio of DMSO and THF (6:4) by using mechano-electrospinning. The linear shape and decrease in size of fiber was observed as the concentration of blend solution decreases from 30-27 %. However if concentration was reduced to 26 %, regular coil shaped uniform fibers were produced. We also found that solution prepared in 6:4 (DMSO/THF) and concentration less than 26 % did not facilitate continuous electrospinning. The properties of these blends were investigated using a rotational rheometer and SEM, in an attempt to understand the relationships between their rheological and morphological properties. It was concluded that concentration of solution played an important role to the diameter of fiber and significant impact on the shape of fiber.

Nanoencapsulated Core and Shell Electrospun Fibers of Resorcinol Formaldehyde

“…However, in the case of lower concentration, the bending perturbations increase rapidly, leading to coiling of the fibers as seen in Figure . As proposed by Bajaj et al, the path of an electrospinning jet that possesses bending instability generates helically coiled features of small loops along the advancing perturbation of the charged polymer jet . This progressing path of the perturbation bends into a 3D coil by virtue of the bending instability, forming a smaller coil on a turn of the larger coil which gets deposited on the collector as a helically coiled fiber .…”

Electrospun nanofibres to mimic natural hierarchical structure of tissues: application in musculoskeletal regeneration

“…The fibres are then drawn through water under mechanical tension using rollers. Lastly, the elongated fibres are drawn out of the water bath and collected on to the rotating drums (Bajaj et al, 2012). Further, dynamic liquid collectors are used to manipulate the fibre alignment and morphology.…”