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Study on the Preparation and Performance of Poly(vinyl alcohol) Polyampholyte Membrane Materials

Author: YuLiJuan
Tutor: MengPingRui
School: Jinan University
Course: Polymer Chemistry and Physics
Keywords: Polyampholyte Polyvinyl alcohol Pervaporation Graft copolymerization 2D FTIR spectra
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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Abstract


The Polyelectrolyte both polymer long chain and small molecule electrolyte double ionization structure characteristics, to ordinary polymer does not have features. Compared with the non-ionic polymers, polyelectrolytes having a good hydrophilicity, chargeability and stability in water, these characteristics make it widely used in many fields. The topics to polyvinyl alcohol (PVA) as the base material, the use of the graft copolymerization reaction and Hoffman degradation reaction of the synthesized material of two kinds of PVA-based the polyampholytic (PBPA), two PBPA material to characterize the structure and performance testing. The PVA grafted polyethylene ammonium / sodium polyacrylate (PVA-gP (VAM-SAC), referred to as the PBPA Ⅰ) Synthesis and Characterization: potassium persulfate as the initiator, acrylamide (AM) and acrylic acid (AA) graft to PVA synthetic PVA graft polyacrylamide / sodium polyacrylate (PVA-GP (for AM-SAC)), then Hofmann degradation system PBPA Ⅰ; initiator type and concentration, reaction temperature, reaction time, monomer concentration on the graft copolymerization reaction, to determine the optimum reaction conditions; infrared (IR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) PBPA Ⅰ structural characterization and performance testing. The results show that: PBPA I in 1666 cm -1, and 1574 cm -1 appear NH3 asymmetric and symmetric bending vibration absorption peak at 1567 cm -1 < / sup> 1416 cm -1 at the symmetric and antisymmetric carboxylate stretching vibration absorption peak; SEM image shows the surface morphology of the PBPA Ⅰ than PVA has changed significantly; DSC tests show the graft change The resistance of the PVA after heat resistance improved significantly. PBPA Ⅰ both plasma membrane of the performance tests: When the the PBPA Ⅰ solution of pH = 4, the system PBPA Ⅰ film of the water resistance of the best; film water resistance with the annealing temperature was elevated and improve; PBPA Ⅰ film of absorbent rate than PVA film significantly significant improvement . Organics weaker polarity, the better the separation selectivity of the the PBPA of Ⅰ film of the organic matter in the water. PVA the grafted polyethylene ammonium / polypropylene sulfonate (PVA-gP (VAM-SAS), referred to as the synthesis and characterization of the PBPA Ⅱ): potassium persulfate as the initiator, AM and propylene sulfonic acid (SAS) at the same time graft to PVA synthetic PVA grafted polyacrylamide / polypropylene sulfonate (PVA-gP (AM-SAS)), then the Hofmann degradation system PBPA Ⅱ; orthogonal test and single factor analysis combine to determine The optimal reaction conditions; respectively IR, SEM, DSC PBPA Ⅱ structural characterization and performance testing. The results showed that: PBPA II in addition to keep the characteristic absorption peak of the PVA in 1671 cm , -1 , and 1570 cm -1 at the emergence of the peak of the characteristic absorption of ammonium ions in 1201 the-cm -1 1036 cm -1 and 627 cm -1 appears at the characteristic absorption peak sulfonates; graft copolymer structure PVA occurs a significant change, and the heat resistance is remarkably improved. PBPA Ⅱ both plasma membrane of the performance test: when the the PBPA Ⅱ solution of pH = 6 pm, the system PBPA Ⅱ film of the water resistance of the best; film water resistance with the annealing temperature of the rise and improve; PBPA Ⅱ film of absorbent rate than PVA film also significant with improved. Organics weaker polarity, the PBPA II membrane separation selectivity of the organic matter in the water as possible. PBPA Ⅰ, PBPA Ⅱ two kinds of plasma membrane of organic matter in the water adsorption penetration process test: respectively, the use of one-dimensional infrared (1D-IR) and two-dimensional infrared (2D-IR) analysis of the PBPA Ⅰ PBPA Ⅱ film of ethanol / water, acetone / water, isopropanol / water and acetic acid / water four organic / water adsorption permeation behavior of the system. The results showed that: the PBPA Ⅰ, PBPA II two membrane for ethanol / water, acetone / water, isopropanol / water separation, not suitable for separation of acetic acid / water solution; the graft a high PBPA film the adsorption of water is better, the water in better; a PBPA film adsorption diffusing and water in the organic matter in the in PBPA Ⅰ, PBPA Ⅱ two membranes in the diffusion process is basically the same: free water is preferentially adsorbed to penetrate to the film, and then were associating with the film of a polyion, and ultimately achieve swelling balanced. The PBPA Ⅰ, PBPA Ⅱ two composite membrane pervaporation performance test: respectively the PBPA Ⅰ and PBPA Ⅱ of as an active film coated polyacrylonitrile (PAN) support membrane preparation of composite membrane 90 ° C, for 95% ethanol / water and different alcohol / water mixture separation, two PBPA Ⅰ PBPA II composite membrane separation factor α greater than 1000, the permeate flux J is greater than 1000 g / (m 2 · h), and pure PVA PVA compared to the cross-linked film, PBPA I PBPA II composite membrane separation performance has significantly improved. This study polyampholyte can be directly dissolved in water and does not form a precipitate, once the deposition process is simple, omitted inverting ions need composite generate complex process. 1D, 2D-IR analysis techniques for organics dehydration, provides a fast, easy-film selection method, pervaporation membrane separation process to provide new ideas and theoretical basis for the interpretation. The PBPA Ⅰ, PBPA Ⅱ two composite film is expected to become the industrial application of organics dehydration film.

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