Isopropyl alcohol: an unusual, powerful, ‘green’ solvent for the preparation of silicone–urea copolymers with high urea contents

Cleaning of microfiltration membranes from industrial contaminants using “greener” alternatives in a continuous mode

“…Even if a small amount of organic co-solvent is used in order to enhance the process efficiency, most of the advantages valid for pure supercritical carbon dioxide as solvent are still valid, making the process "greener" and sustainable comparing to the current method of cleaning. Additionally, according to greenness assessment of ethyl alcohol or isopropyl alcohol, this particular usage of them in this process can support their recall as unique, powerful, "greener solvents" [5,6]. We can recall the toxicity and volatility of isopropyl alcohol that can be a base to classify it as "greener" solvent.…”

“…Low volatility is a highly desirable characteristic in a solvent, several solvents considered as "green" such as ethanol, ethyl acetate, and limonene are volatile yet at the same time are greener than other less volatile solvents [5]. For similar reason isopropyl alcohol was called to be an unusual, powerful, "green" solvent [6].…”

“…For this reason, our work was designed to clean microfiltration membranes in a continuous mode (i.e. with continuous flow of the solvent through the extraction vessel, in which the membrane is placed, with solvent recirculation in the system), as preferable industrially and on screening "greener" solvent [5,6] addition to affect cleaning efficiency calculated as an extraction yield. The impact on other operational parameters such as solvent flow rate and process pressure on the process to overcome the drawbacks pointed out above were also aimed to be studied in this work.…”

Synthesis and structure-property relationships of biodegradable polyurethanes

“…Recently, segmented poly(dimethylsiloxane)-based PUU copolymers have been synthesized by the two-step solution polymerization procedure in a tetrahydrofuran/NMP mixture with a large proportion of polar NMP solvent, which provides good solubility of the growing chains, thus ensuring copolymers of relatively high molecular weight [30]. Also, the use of isopropanol (IPA) as a solvent for the synthesis of polyurea copolymers with a high hard segment content has been reported [29,31].…”

Influence of solvent composition and degree of reaction on the formation of surface microtopography in a thermoset siloxane–urethane system

“…MAK, EEP, and BA were chosen since they are common polar solvents for polyurethane systems, but have different evaporation rates. IPA has been recently shown to be an effective solvent for polyurethanes and has a large hydrogen bonding component of the solubility parameter [29]. Toluene was chosen since it is a good solvent for PDMS.…”