Rheology and pressurised gyration of starch and starch-loaded poly(ethylene oxide)
This work investigates the rheology and spinning of starch and starch-loaded poly(ethylene oxide) (PEO) by pressurised gyration in order to prepare nanofibres. The spinning dope's rheological properties played a crucial role in fibre formation. Newtonian behaviour is observed in 1-20 wt% starch suspensions and non-Newtonian behaviour is found in all the PEO-starch mixtures. Pressurised gyration of the starch suspensions produced beads only but PEO-starch mixtures generated fibres. The fibre diameter of the PEO-starch samples is shown to be a function of polymer concentration and rotating speed of the gyration system. Fibre formation can only be facilitated below a certain working pressure. The concentration of starch in the PEO-starch mixtures is crucial in defining whether beaded or continuous fibres were generated and this is related to the composition of the spinning dope. FT-IR, XRD and microscopy studies indicated very good miscibility of starch and PEO in the nanofibres. The storage modulus of the PEO-starch were also studied as a function of temperature (30-150 °C) and showed interesting results but it was not possible to deduce general trends valid for the entire temperature range.
Item Type | Article |
---|---|
Keywords | gyration, nanofibres, polymer, pressure, starch, organic chemistry, materials chemistry, polymers and plastics |
Date Deposited | 15 May 2025 12:51 |
Last Modified | 30 May 2025 23:59 |
-
picture_as_pdf - 1_s2.0_S0144861714007747_main.pdf
-
subject - Published Version
-
lock - Restricted to Repository staff only