Centrifugal melt spinning of polyvinylpyrrolidone (PVP)/triacontene copolymer fibres

Abstract

Polyvinylpyrrolidone/1-triacontene (PVP/TA) copolymer fibre webs produced by centrifugal melt spinning were studied to determine the influence of jet rotation speed on morphology and internal structure as well as their potential utility as adsorbent capture media for disperse dye effluents. Fibres were produced at 72°C with jet head rotation speeds from 7000 to 15,000 r min -1 . The fibres were characterised by means of SEM, XRD and DSC. Adsorption behaviour was investigated by means of an isothermal bottle point adsorption study using a commercial disperse dye, Dianix AC-E. Through centrifugal spinning nanofibers and microfibers could be produced with individual fibres as fine as 200-300 nm and mean fibre diameters of ca. 1-2 lm. The PVP/TA fibres were mechanically brittle with characteristic brittle tensile fracture regions observed at the fibre ends. DSC and XRD analyses suggested that this brittleness was linked to the graft chain crystallisation where the PVP/TA was in the form of a radial brush copolymer. In this structure, the triacontene branches interlock and form small lateral crystals around an amorphous backbone. As an adsorbent, the PVP/TA fibres were found to adsorb 35.4 mg g -1 compared to a benchmark figure of 30.0 mg g -1 for a granular-activated carbon adsorbent under the same application conditions. PVP/TA is highly hydrophobic and adsorbs disperse dyes through the strong ''hydrophobic bonding'' interaction. Such fibrous assemblies may have applications in the targeted adsorption and separation of non-polar species from aqueous or polar environments.

Water‐born 3D nanofiber mats using cost‐effective centrifugal spinning: comparison with electrospinning process: A complex study

“…O'Haire et al 43 reported a reduction of fiber diameters with increasing rotational speed, but in their case PVP polymer was used. However, the authors did not submit standard deviations for single‐diameter fibers, and in this case the standard deviations are the decisive factor of individual measurements.…”

Innovative and efficient preparation of high-performance polyacrylonitrile-based carbon fiber paper by centrifugal spinning

“…17 In recent years, fiber-based materials fabricated by centrifugal spinning have been used in various fields, such as energy storage, thermal insulation, and medical dressings. [18][19][20][21][22][23] Moreover, the productivity of centrifugal spinning exceeds 1 gÁmin À1 per nozzle, which is significantly higher than that of laboratory-scale electrospinning (0.1 gÁh À1 ). 24 However, most centrifugal spinning equipment can only collect fibers using columns.…”

Environmentally friendly polymeric films based on biocarbon, synthetic zeolite and PVP for agricultural chemistry

“…PVP is not suitable for thermoplastic processing in the usual manner since it is very brittle in pure form, which is why plasticizers are added to make PVP-based films [6,7]. A recent shift has been to utilize natural or biodegradable plasticizers with low toxicity and good compatibility [8]; examples compatible with PVP and water include glycerol, sorbitol, mannitol, arabic gum, polyethylene and glycol [9][10][11].…”