Rapid-Flow and Spin-Trapping ESR Study on Carbonyl-Conjugated Radicals of Modified Poly(vinyl alcohol) Bearing 1,2-Propanediol Pendant Moiety as Intermediates of Graft Copolymerization

2017 ◽  
Vol 90 (12) ◽  
pp. 1293-1308
Author(s):  
Kazuma Matsui ◽  
Yuko Nishihara ◽  
Tomoko Yamaguchi ◽  
Yasuhiro Sakurai ◽  
Yusuke Miyake ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Graft Copolymerization ◽  
Spin Trapping ◽  
Poly Vinyl Alcohol ◽  
Rapid Flow

Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

2016 ◽  
Vol 852 ◽  
pp. 979-983
Author(s):  
Ping Rui Meng ◽  
Liang Bo Li
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Permeate Flux ◽  
Ft Ir ◽  
Ethanol Aqueous Solution ◽  
Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

Improving the Compatibility of Zein/Poly(vinyl alcohol) Blends by Gamma Irradiation and Graft Copolymerization of Acrylic Acid

2010 ◽  
Vol 58 (7) ◽  
pp. 4470-4476 ◽  
Author(s):  
Magdy M. Senna ◽  
Stephane Salmieri ◽  
Abdel-Wahab El-naggar ◽  
Agnes Safrany ◽  
Monique Lacroix
Keyword(s):  
Acrylic Acid ◽  
Gamma Irradiation ◽  
Vinyl Alcohol ◽  
Graft Copolymerization ◽  
Poly Vinyl Alcohol
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