High shear vortex fluidic morphologically controlled polysulfone formed under anhydrous conditions

Aghil Igder, Ahmed Hussein Mohammed Al-Antaki, Scott J. Pye, Alireza Keshavarz, Ata Nosrati, Colin L. Raston

Research output: Contribution to journalArticlepeer-review

Abstract

Polysulfone (PSF) was prepared under anhydrous conditions, under high shear in a vortex fluidic device (VFD) operating under confined mode, in DMSO, thereby avoiding the use of chlorinated solvents, unlike in conventional batch processing in generating the polymer. The effect of systematically varying the operational parameters of the VFD (rotational speed (ω) and tilt angle (θ) of the 20 mm diameter quartz tube housed in the device, and temperature and processing time) was investigated with respect toMWandTgof the polymer, with the product further characterised using FTIR, NMR, GPC, DSC, SEM and BET. As a comparison, for the optimal processing parameters (ω6k rpm,θ45°,t160 °C,T60 min), theMWandTg, ∼16 kg mol−1and ∼170 °C respectively, were significantly increased relative to those prepared without exclusion of moisture, ∼6.7 kg mol−1and ∼154 °C respectively. SEM established that increasingωresulted in different morphologies of the PSF, forming sheet-like structures at lower rotational speeds then pseudo-spherical structures followed by a mixture of sheet-like and rod-shape structures for increasingω. Change in temperature of the reaction also impacted on the nature of the product, with sheet-like structures formed at 140 °C and fibrous material at 170 °C. BET findings correlated with SEM images with a higher surface area for fibrous material, ∼4000 m2g−1, compared to ∼1470 m2g−1for the sheet-like structures. The different morphologies arising from change inωand temperature relate to different topological fluid flows in the VFD.

Original languageEnglish
Pages (from-to)10268-10276
Number of pages9
JournalNew Journal of Chemistry
Volume45
Issue number23
DOIs
Publication statusPublished - 21 Jun 2021

Keywords

  • Polysulfone (PSF)
  • vortex fluidic device (VFD)
  • anhydrous conditions
  • high shear
  • chlorinated solvents
  • topological fluid flows

Fingerprint

Dive into the research topics of 'High shear vortex fluidic morphologically controlled polysulfone formed under anhydrous conditions'. Together they form a unique fingerprint.

Cite this