Membrane gas separations require materials
with high permeability and good selectivity. For glassy
polymers, the gas transport properties depend strongly on
the amount and distribution of free volume, which may be
enhanced either by engineering the macromolecular backbone
to frustrate packing in the solid state or by thermal conversion
of a soluble precursor to a more rigid structure of appropriate
topology. The first approach gives polymers of intrinsic
microporosity (PIMs), while the second approach is used in
thermally rearranged (TR) polymers. Recent research has
sought to combine these approaches, and here a new range of
thermally rearrangeable PIM-polyimides are reported, derived from dianhydrides incorporating a spiro center. Hydroxylfunctionalized polyimides were prepared using two different diamines: 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane
(bisAPAF) and 4,6-diaminoresorcinol (DAR). Thermal treatment at 450 °C under N2 for 1 h yielded polybenzoxazole (PBO)
polymers, which showed increased permeability, compared to the precursor, in membrane gas permeation experiments. A
polymer based on DAR (PIM-PBO-3) exhibited a CO2/N2 selectivity of 30 as prepared, higher than the values of 21−23
obtained for polymers derived from bisAPAF with the same dianhydride (PIM-PBO-1).
2014-07
Iraq. J of Polymers
(Issue : 2)
(Volume : 16)
1. Synthesis of Peppermint-S-Stem-g-poly (acrylic acid) and its application for Nickel Ions Removal
In this work peppermint stem (PMS) was collected from Baghdad area, which is a wild plant,
dried and ground to particle size 200-500µm, then washed repeatedly with plenty of deionized
water to remove all soluble materials. The peppermint stem powder was then grafted with acrylic
acid (GPMS) and characterized by FTIR and thermal analysis. The PMS and GPMS were used
for removal of Ni(II) ions from aqueous solution. Adsorption of Ni(II) ions onto PMS and
GPMS were found to be pH dependent and maximum removal of Ni(II) ions were obtained at
pH 7. The adsorption kinetic data of Ni(II) onto PMS and GPMS were best fitted with the
Pseudo-second-order kinetic model. The equilibrium data were also fitted well with the
Langmuir and Freundlich isotherm models. From RL values, it was concluded that the adsorption
of Ni(II) onto PMS and GPMS were favored. The activation energy Ea of the adsorption process
was determined and found to be 7.7 KJ mol-1
for the adsorption of Ni(II) onto PMS reflecting the
physisorption process and that for the adsorption of Ni(II) onto GPMS was 70.3 KJ mol-1
indicate that the adsorption may be chemical in nature.
2012-07
Thesis
2017
“Mixed Matrix Membranes Consisting of Porous Polyimide Networks and polymers of Intrinsic Microporosity for Gas Separation”
Ph.D in Materials Chemistry
2025
2007-06-28
“Effect of Hydrogen Peroxide on the Activated Carbon Produced by Chemical Treatment”
M.Sc. in Chemistry
2007
Presentation
Chemistry department/ College of Science/ University of Zakho
2021-02
“Mixed Matrix Membranes Consisting of Porous Polyimide Networks and polymers of Intrinsic Microporosity for Gas Separation”
Ph.D Thesis in Materials Chemistry
2021
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