Polypropylene: Costumer Analysis

Polypropylene (PP) (MFI = 0.35 g/10 min) was provided by Arak Petrochemical Company (Iran). Acetone, Irganox and mineral oil were purchased from Merck, CibaCo and Acros Organics, respectively. A mixture of sulfuric acid (98% H2SO4) and pure hydrogen peroxide (H2O2), used as Piranha solution, were purchased from Merck. Methanol (MeOH), tetraethylorthosilicate (TEOS), methyltriethoxysilane (MTES) and ammonium hydroxide (NH4OH) as cosolvent, precursor, hydrophobic agent and catalyst, respectively, for synthesis of NPs were purchased from Merck. Membrane preparation The PP hollow fiber membranes were fabricated by thermally induced phase separation method (TIPS) [21]. The polymer dope solution was prepared by mixing the measured amounts of PP, mineral oil and

All spectra were collected over a scanning range of 600–4000 at room temperature. Mechanical strength measurement
The breaking tensile strength of a single fiber was measured with a (STM-5, SANTAM) tensile machine. The primary length of each fiber was adjusted at 10 cm, and the crosshead speed was 10 mm/min.
Breakthrough pressure
Wetting resistance of membrane is usually characterized by the breakthrough pressure (∆p) into the maximum pore using the Laplace-Young equation [23] that can be expressed as follows:
.
(1) where〖 σ〗_(1 )is the liquid surface tension, θ is the contact angle between the membrane surface and absorbent liquid and d_max is the maximum pore diameter in the membrane.
This equation shows that the absorbent liquid will not wet the surface of membrane when the pressure difference between the gas phase and liquid stream in membrane pores is lower than the penetration pressure. Measurement of CO2 absorption and long-term stability