N-methyl-2-pyrrolidone as a solvent for poly(vinyl alcohol)

✍ Scribed by Paresh Patel; Ferdinand Rodriguez; George Moloney

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 403 KB
• Volume: 23
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1979.070230811

✦ Synopsis

NMP (N-methyl-2-pyrrolidone) and its mixtures with water have been investigated as solvents for PVA [poly(vinyl alcohol)]. Judging from the higher exponent in the Mark-Houwink equation, NMP appears to be a better solvent than water. The equation found is

for solutions in NMP at 30°C. Although the viscosity of NMP-water mixtures goes through a maximum when the molar ratio of NMP to water is 1:2, the intrinsic viscosity for PVA exhibits neither a maximum nor a minimum in mixtures ranging from pure water to pure NMP. As in aqueous solutions, the intrinsic viscosity in NMP solutions decreases slightly with increasing temperatures from 20 to 5OOC.