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

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.

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Gelatin-Glutaradehyde-Poly(Vinyl Alcohol) Bioadsorbent: Synthesis, Characterization and Application for Copper(II) Ion Removal from Synthetic Aqueous Solution

Materials Science Forum ◽

10.4028/www.scientific.net/msf.569.217 ◽

2008 ◽

Vol 569 ◽

pp. 217-220 ◽

Cited By ~ 1

Author(s):

Xue Gang Luo ◽

Feng Liu ◽

Xiao Yan Lin ◽

Jian Zhou

Keyword(s):

Aqueous Solution ◽

Vinyl Alcohol ◽

Freundlich Isotherm ◽

Poly Vinyl Alcohol ◽

Isotherm Equation ◽

Ion Removal ◽

Adsorption Data ◽

Initial Ph ◽

Ft Ir

A new Gelatin-glutaradehyde-Poly(vinyl alcohol) bioadsorbent was synthesized by immobilizing Poly(vinyl alcohol) onto gelatin followed by cross-linking. This technique gives the bioadsorbent of gelatin good chemical resistance and mechanical strength. SEM and FT-IR were conducted for characterization of the bioadsrobent. A comprehensive adsorption study of Copper(II) removal from synthetic aqueous solution by adsorption on this bioadsorbent was conducted regarding the effects of initial pH, time, and copper(II) initial concentration. The adsorption data were applied to Freundlich isotherm equation and its contents were calculated. The results obtained showed that the new absorbent has good performance for the removal of copper(II).

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Compacting of poly(acrylamide)-poly(vinyl alcohol) grafted copolymers in aqueous solution of phenol and its effect in the copolymers films structure

Macromolecular Symposia ◽

10.1002/1521-3900(200103)166:1<237::aid-masy237>3.0.co;2-r ◽

2001 ◽

Vol 166 (1) ◽

pp. 237-242 ◽

Cited By ~ 1

Author(s):

Vladimir Syromyatnikov ◽

Tatyana Zheltonozhskaya ◽

Jean-Michel Guenet ◽

Iryna Rakovich ◽

Ol'ga Demchenko ◽

...

Keyword(s):

Aqueous Solution ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Poly Acrylamide

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Preparation and Properties of Biodegradable Sodium Lignosulfonate/Poly(Vinyl Alcohol) Blend Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.676 ◽

2010 ◽

Vol 160-162 ◽

pp. 676-681 ◽

Cited By ~ 3

Author(s):

Xian Fa Li

Keyword(s):

Vinyl Alcohol ◽

Water Resistance ◽

Aqueous System ◽

Poly Vinyl Alcohol ◽

Process Conditions ◽

Biodegradable Films ◽

Sodium Lignosulfonate ◽

Sorptive Capacity ◽

Blend Films ◽

Ft Ir

A biodegradable films were prepared by blending sodium lignosulfonate (LS) with poly(vinyl alcohol) (PVA) and with borax as cross-linking agent, in an aqueous system. The suitable process conditions of preparing the blend films with good water-resistance and mechanical properties were determined by single-factor experiments. SEM, FT-IR, TGA and DSC analysis were performed to examine the contribution of LS and borax to the properties of the blend films. The results indicated that the introduction of a moderate LS mass ratios to PVA from 1/8 to 4/8 in the blend films could simultaneously enhance the tensile strength of blend films up to 43.98MPa. SEM showed that the intermiscibility of blend films was satisfactory with appropriate LS. Studies of the water sorptive capacity of the materials suggested that the water sorptive capacity at equilibrium less than 17% and water-resistance improved. The results of TGA indicated blend films have greater thermal stability than the pure polymers.

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

RSC Advances ◽

10.1039/c5ra23285f ◽

2016 ◽

Vol 6 (9) ◽

pp. 7653-7660 ◽

Cited By ~ 12

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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