Separation of liquid mixtures by using polymer membranes. III. Grafted poly(vinyl alcohol) membranes in vacuum permeation and dialysis

1981 ◽  
Vol 26 (10) ◽  
pp. 3223-3243 ◽  
Author(s):  
V. Shantora ◽  
R. Y. M. Huang
Keyword(s):  
Vinyl Alcohol ◽  
Polymer Membranes ◽  
Liquid Mixtures ◽  
Poly Vinyl Alcohol

Controlled Preparation of Microporous Polymer Membrane by Simple Biodegradation Method

2011 ◽  
Vol 109 ◽  
pp. 110-113
Author(s):  
Gui Zhen Guo ◽  
You Yi Sun ◽  
Bin Hua Yang ◽  
Ya Qing Liu
Keyword(s):  
Vinyl Alcohol ◽  
Polymer Membranes ◽  
Polymer Membrane ◽  
Porous Polymer ◽  
Poly Vinyl Alcohol ◽  
Composite Polymer ◽  
Microporous Polymer ◽  
Method Effects ◽  
Contact Instrument ◽  
Controlled Preparation

A microporous poly(vinyl alcohol)/Starch composite polymer membrane was successfully synthesized by a biodegradation method. Effects of different poly(vinyl alcohol)/Starch compositions on the porous structures of the porous polymer membranes were further investigated in detail. The characteristic properties of PVA/ Starch composite polymer membranes were systematically studied by scanning electron microscopy (SEM), SL200B angle of contact instrument and Sturm test. The result shows the formation of 1μm-10μm microporous in the blend polymer membrane, which strongly depended on the content of starch in the blend. This method is convenient and will greatly promote the practical application of porous polymer membranes in various areas.

scholarly journals Preparation and Characterizations of Zeolite – Filled Natural Rubber/Poly(vinyl alcohol) Semi–IPN Membranes

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
J. Patthana ◽  
C. Poonsawat ◽  
S. Amnuaypanich
Keyword(s):  
Natural Rubber ◽  
Vinyl Alcohol ◽  
Polymer Network ◽  
Water Concentration ◽  
Liquid Mixtures ◽  
Sem Analysis ◽  
Interpenetrating Polymer Network ◽  
Poly Vinyl Alcohol ◽  
Zeolite Content ◽  
Sulfosuccinic Acid

Semi–interpenetrating polymer network (semi–IPN) of natural rubber (NR) and crosslinked poly(vinyl alcohol) (PVA) was composited with zeolite 4A to form a mixed matrix (MM) membrane. PVA was crosslinked with sulfosuccinic acid (SSA) in the immediate presence of NR and zeolite. FT–IR spectroscopy confirmed the crosslinking of PVA in the MM membrane. Swelling measurements were carried out in both water and absolute ethanol. The degrees of swelling in both water and ethanol increased with increasing PVA content in the membranes, however they were found to decline upon increasing zeolite content more than 10 %w/w. The mechanical properties of the MM membranes were investigated by tensile testing. It was observed that the modulus increased with increasing zeolite content in membranes but the elongation at break was found to decrease. The thermal degradation of the MM membranes was studies using thermal gravimetry (TG). The MM membranes showed higher thermal stability compared with NR/PVA membrane due to the incorporation of zeolite. The dispersion of zeolite particles in the MM membrane was observed by scanning electron microscopy (SEM) analysis which showed a well dispersing of zeolite particles in the semi–IPN matrix. The sorption selectivities of MM membranes were enhanced with zeolite content especially, at low water concentration of ethanol–water mixtures. However the sorption selectivities of MM membranes decreased when water content in the liquid mixtures increased.

scholarly journals Chemically and Thermally Crosslinked PVA-Based Membranes: Effect on Swelling and Transport Behavior

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1799 ◽  
Author(s):  
Rynkowska ◽  
Fatyeyeva ◽  
Marais ◽  
Kujawa ◽  
Kujawski
Keyword(s):  
Water Sorption ◽  
Polymer Membranes ◽  
Liquid Mixtures ◽  
Poly Vinyl Alcohol ◽  
Esterification Reaction ◽  
The Novel ◽  
Membrane Composition ◽  
Alcohol Dehydration ◽  
Elongation At Break ◽  
Sulfosuccinic Acid

The novel poly(vinyl alcohol) (PVA)-based membranes were prepared using the two-step crosslinking approach: the chemical crosslinking of PVA using sulfosuccinic acid (SSA) (0–50 wt.%) and the thermal treatment (120–160 °C). The membrane composition and crosslinking temperature were optimized in terms of the mechanical and transport properties. The FTIR-ATR analysis revealed that the increase of the SSA concentration and crosslinking temperature resulted in the rise of the ester bond bands intensity due to the esterification reaction between PVA and SSA. As a consequence, the PVA-based membrane with 50 wt % SSA and crosslinked at 140 °C showed the reduced Young’s modulus (from 1266.2 MPa to 1.4 MPa) and elongation at break (from 316% to 66%) in comparison with the pure PVA membrane. The studied swelling behavior of the obtained membranes revealed significantly higher water sorption than that in methanol and propal-2-ol whatever the crosslinking temperature. The performed studies provide a new way of tailoring the membrane physicochemical properties, in particular, the surface hydrophilicity. In addition, the obtained results are crucial for the design and elaboration of the polymer membranes for the pervaporative separation of the liquid-liquid mixtures, in particular, for the alcohol dehydration.

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