Effect of mesoporous silica nanoparticles on the properties of polyurethane network composites

Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites

“…A four-necked reactor with a sealed mechanical stirrer, nitrogen intake, temperature controller, and condenser was used for the polymerization [53]. The reactor was first loaded at room temperature with determined quantities of a,x-PDMS and MDI, dissolved in the mixture of NMP/THF (9/1, v/v), and heated in nitrogen atmosphere up to 75 °C [53]. The reaction began with the addition of a NMP/THF 0.04 wt% Sn(Oct) 2 solution.…”

“…Thermogravimetric (TGA) tests were performed on a nitrogen flow of 60 mL/min using Thermogravimetric Analyzer TA Instruments TGA Q500 (Delaware, USA). Samples (8-10 mg) were deposited into the platinum crucible and inserted into the TG oven and heated from 25 to 700 °C at a rate of heating of 5 °C/min [53].…”

“…Setaram Instrument DSC 151R differential scanning calorimetry (DSC) was carried out. The heat and cooling rates of 10 °C and 5 °C/min, respectively, were used in a range from -150 to 260 °C, under the helium purge flow of 25 ml/min for sample scanning (around 10 mg of sample) [53].…”

“…The load force applied was 30 mN, and the ratio of Poisson was 0.49. In all, there were 100 measurements for each specimen, dispersed throughout the center area of the sample surface in a matrix of 10 to 10 dots with a distance of 150 lm 9 150 lm [53].…”

“…The swelling test results derived from the THF experiments and Flory-Rehner equation for equilibrium swollen networks were used to compute the molar number of elastically effective network chains per cubic centimeter [17,18,55]. Values of density and volume fraction of the cross-linked polymer in the swollen specimen, V, were calculated using results of swelling experiments in THF for the prepared NP-PUs and pure PU films as previously described in detail [17,53].…”