Structural changes of water in poly(vinyl alcohol) hydrogel during dehydration

2014 ◽  
Vol 140 (4) ◽  
pp. 044909 ◽  
Author(s):  
Kushi Kudo ◽  
Junichi Ishida ◽  
Gika Syuu ◽  
Yurina Sekine ◽  
Tomoko Ikeda-Fukazawa
Keyword(s):  
Vinyl Alcohol ◽  
Structural Changes ◽  
Poly Vinyl Alcohol

SAXS Studies on Structural Changes in a Poly(vinyl alcohol) Film during Uniaxial Stretching in Water

2006 ◽  
Vol 39 (8) ◽  
pp. 2921-2929 ◽  
Author(s):  
Tsukasa Miyazaki ◽  
Akie Hoshiko ◽  
Midori Akasaka ◽  
Takuji Shintani ◽  
Shinichi Sakurai
Keyword(s):  
Vinyl Alcohol ◽  
Structural Changes ◽  
Poly Vinyl Alcohol ◽  
Uniaxial Stretching

Synthesis and bharacterization of poly(vinyl alcohol)-boric acid beads from PVA with several hydrolysis degrees

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Adriana de Melo ◽  
Daniel L. G. Borges ◽  
Nito A. Debacher ◽  
Adilson J. Curtius
Keyword(s):  
Boric Acid ◽  
Trace Element ◽  
Vinyl Alcohol ◽  
Inductively Coupled Plasma ◽  
Structural Changes ◽  
Trace Element Content ◽  
Effluent Treatment ◽  
Poly Vinyl Alcohol ◽  
Acidic Solutions

AbstractThis work describes the synthesis and characterization of poly(vinyl alcohol)-boric acid (PVA-BA) sphere-like beads. The PVA-BA beads were prepared by the dropwise addition of PVA aqueous solutions to a boric acid solution under constant stirring and controlled temperature. Different temperatures for bead formation as well as PVA with several hydrolysis degrees were used and tested. PVA with several hydrolysis degrees were characterized regarding molecular mass and intrinsic viscosity, while characterization of PVA-BA beads was carried out using thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results obtained with TGA have shown that structural changes occurs in PVA following the reaction with boric acid and that the spheres formed are thermally stable, whereas SEM analysis demonstrated that symmetric sphere-like beads were formed, with considerable porosity, which are requisite for solid supports when applied to effluent treatment. Trace element extraction tests were carried out using inductively coupled plasma mass spectrometry (ICP-MS). Without the addition of a chelating agent, no significant extraction occurred from acidic solutions, while after the addition of ethylenediaminetetracetate, less than 10% of the trace element content was extracted from the aqueous phase by the PVA-BA beads. However, after the addition of ammonium O,O-diethyldithiophosphate (DDTP), over 10% of As, Co, Cr, Fe, Sr and Zn, 40% of Cd and 70% of Pb were extracted from acidic solutions, even without any further optimization. The results have shown that the synthesized PVA-BA beads are potential alternatives for trace element extraction in effluent treatment.

High modulus poly (vinyl alcohol) fibers by zone drawing

1986 ◽  
Vol 1 (6) ◽  
pp. 861-869 ◽  
Author(s):  
Paul D. Garrett ◽  
David T. Grubb
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
High Modulus

BIODEGRADATION BEHAVIOR OF POLY(VINYL ALCOHOL) - WOOD COMPOSITES

2019 ◽  
Vol 18 (1) ◽  
pp. 125-136 ◽  
Author(s):  
Luiza Jecu ◽  
Iuliana Raut ◽  
Elena Grosu ◽  
Mariana Calin ◽  
Violeta Purcar ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Wood Composites
Sign in / Sign up

Export Citation Format

Share Document