Ultrasonic absorption and visco-relaxation study of poly(vinyl alcohol) aqueous solution. (A method for the determination of molecular weight)

1989 ◽  
Vol 21 (4) ◽  
pp. 333-337
Author(s):  
Subhi Kemal Hassun ◽  
Suad Omran Isa
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Ultrasonic Absorption ◽  
Relaxation Study

Prevention of crust formation in soils by poly(vinyl alcohol)

Soil Research ◽  
1976 ◽  
Vol 14 (2) ◽  
pp. 139 ◽  
Author(s):  
JM Oades
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Soil Erosion ◽  
Vinyl Alcohol ◽  
Seedling Emergence ◽  
Water Storage ◽  
Poly Vinyl Alcohol ◽  
Crust Formation ◽  
Run Off ◽  
Horticultural Practice

The successful field stabilization of a seedbed by poly(viny1 alcohol) (PVA) with a molecular weight close to 70000 is described. Stabilization of the 0-2 cm layer of the seedbed by spraying on PVA in aqueous solution at rates of 8-10 g m-2 was shown to increase seedling emergence, rainfall infiltration and water storage. The PVA prevented crust formation, thus reducing surface run-off and soil erosion by one-half compared with control areas. The improved infiltration led to increased leaching of mineral nitrogen down the profile. The treatment may be useful for stabilization of experimental areas, preparation of lawns or intensive horticultural practice.

Multiporous open-cell poly(vinyl formal) foams for sound absorption

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 7653-7660 ◽  
Author(s):  
Bai Xue ◽  
Jianguo Deng ◽  
Junhua Zhang
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Sound Absorption ◽  
Poly Vinyl Alcohol ◽  
Open Cell

A series of multiporous open-cell poly(vinyl formal) (PVF) foams were obtained by crosslinking poly(vinyl alcohol) (PVA) with different contents of formaldehyde in aqueous solution.

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