Total replacement of solvent in polyurethane synthesis using carbon dioxide soluble 1, 3‐dichlorodistannoxane catalysts. Issue 6 (27th September 2012)

• Record Type: Journal Article
• Authors: Gartia, Yashraj; Moore, Josh; Felton, Charlette; Pulla, Sharon; Berry, Brian; Munshi, Pradip; Ghosh, Anindya
• Is Part Of: Journal of applied polymer science. Volume 128:Issue 6(2013:Jun. 15)
• Page Start: 3522
• Page End: 3527
• Publication Date: 2012-09-27
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.38546
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>This work demonstrates catalytic synthesis of polyurethanes using 1, 3‐dichlorodistannoxane catalysts (<bold>1</bold>) in carbon dioxide (CO<sub>2</sub>) and carbon dioxide expanded liquids (CXL). Catalytic polyurethane synthesis was also performed in pure organic solvent (dimethylformamide) for comparison. In this study, mainly, 4, 4′‐methylene‐bis‐(phenyl isocyanate) (MDI) as the diisocyanate precursor and ethylene glycol (EG) as the diol precursor were used for polyurethane synthesis. In addition to MDI, hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), and <italic>p</italic>‐isocyanatobenzylisocyanate (PIBI) were also used for polyurethane synthesis with different diols or triol in CO<sub>2</sub>. Polyurethanes with a molecular weight ranging from 3000 to 70, 000 were synthesized depending upon the combination of diisocyanate and diol used. Comparable yields of polyurethanes were obtained using an all butyl group substituted (<bold>1a</bold>) catalyst in CO<sub>2</sub> (55 bars, 50°C) and in DMF (50°C). Additionally, the yield and polydispersity index (PDI) of polymer formed in neat CO<sub>2</sub> was comparable with those synthesized in the largely used organic solvent DMF. Interestingly, catalyst <bold>1a</bold> in CXL (55 bars, 50°C) gave higher yields, and polymers with lower PDI (1.19). Reactions carried out in scCO<sub>2</sub> at 145 bars using PIBI and EG were found to be about three times faster than the reaction carried out in DMF. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013</p> </abstract>