Purification of polyethylene terephthalate from polyvinyl chloride by froth flotation for the plastics (soft-drink bottle) recycling industry

Wetting properties of food packaging

“…For example, water contact angle values of 90-110°and 76-100°have been reported on LDPE and PET, respectively (Derlich et al, 1999;Guernm, Conil, & Houot, 2000;Owens & Wendt, 1969;van Oss, Good, & Chaundhury, 1988). Contact angles of 25°and 8°have been measured with triolein on polyethylene and PET, respectively (Michalski & Saramago, 2000), while we found 20°and 10°for triolein on LLDPE and PET, respectively (Table 3).…”

“…For smooth surfaces, the most frequently applied approach for quantifying the wettability of plastic materials is the sessile drop method, whereby the contact angle is measured by observing the liquid drop from the side. Another common approach includes a modified Wilhelmy plate technique, in which the plastic material is utilized as a moving probe, resulting in advancing and receding contact-angle measurements (Derlich, Kim, Payne, Miller, & Kobler, 1999;Michalski & Saramago, 2000;Shimizu & Demarquette, 2000).…”

Time, Temperature and Amount of Distilled Water Effects on the Purity and Yield of Bis(2-hydroxyethyl) Terephthalate Purification System

“…A dominant peak at retention time of 3.391 shown in the HPLC chromatogram (appendix; Figure A4), proves that the CP contains BHET. With the peak area of BHET (6,770,895), 103.641 mg/l BHET concentration was obtained using the calibration curve. As a result, higher purity of BHET with 90.91% BHET was further obtained from the CP crystallized at 2 °C (oligomers is 9.09%).…”

“…In addition, PET recycling offers a good potential to minimize the dependency on fossil fuel as a raw material in PET production. Thus, recycled PET has a prospective to substitute virgin PET produced from refined fossil fuels [6]. On top of that, the energy required to produce recycled plastics is less than the production of virgin polymers from fossil fuels [7].…”

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

“…[24][25][26][27][28] This results in an increase in the force required to slide a drop on the solid surface as can be measured using the centrifugal adhesion balance. 3,4,26,29 Mutual saturation between phases or preferential adsorption at interfaces can be very fast, but sometimes, it occurs as a very slow process and thus exceeds the time of contact angle measurements, resulting in data measured under non-equilibrium conditions. 30 A good protocol requires contact angle measurements in liquidsaturated gas environment to at least secure equilibrium solid surface conditions.…”