Graft polymerization of acrylic acid onto starch using potassium permanganate acid (redox system)

1995 ◽  
Vol 56 (2) ◽  
pp. 263-269 ◽  
Author(s):  
Kh. M. Mostafa
Keyword(s):  
Acrylic Acid ◽  
Potassium Permanganate ◽  
Graft Polymerization ◽  
Redox System

scholarly journals Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2028
Author(s):  
Shin-ichi Sawada ◽  
Yasunari Maekawa
Keyword(s):  
Acrylic Acid ◽  
Anion Exchange ◽  
Graft Polymerization ◽  
The Other ◽  
Practical Applications ◽  
Bipolar Membranes ◽  
Graft Polymers ◽  
Grafting Reactions ◽  
Radiation Induced

We prepared novel bipolar membranes (BPMs) consisting of cation and anion exchange layers (CEL and AEL) using radiation-induced asymmetric graft polymerization (RIAGP). In this technique, graft polymers containing cation and anion exchange groups were introduced into a base film from each side. To create a clear CEL/AEL boundary, grafting reactions were performed from each surface side using two graft monomer solutions, which are immiscible in each other. Sodium p-styrenesulfonate (SSS) and acrylic acid (AA) in water were co-grafted from one side of the base ethylene-co-tetrafluoroethylene film, and chloromethyl styrene (CMS) in xylene was simultaneously grafted from the other side, and then the CMS units were quaternized to afford a BPM. The distinct SSS + AA- and CMS-grafted layers were formed owing to the immiscibility of hydrophilic SSS + AA and hydrophobic CMS monomer solutions. This is the first BPM with a clear CEL/AEL boundary prepared by RIAGP. However, in this BPM, the CEL was considerably thinner than the AEL, which may be a problem in practical applications. Then, by using different starting times of the first SSS+AA and second CMS grafting reactions, the CEL and AEL thicknesses was found to be controlled in RIAGP.

scholarly journals Multifunctional Semi-interpenetrating Superabsorbents from Graft Polymerization of Acrylic Acid on Cellulose in Presence of Fulvic Acid as Potential Slow Release Devices of Soil Nutrients

2016 ◽  
Vol 12 (2) ◽  
pp. 4045-4056 ◽  
Author(s):  
Hisham Essawy
Keyword(s):  
Acrylic Acid ◽  
Soil Nutrients ◽  
Network Structure ◽  
Water Retention ◽  
Graft Polymerization ◽  
Morphological Alteration ◽  
Interpenetrating Network ◽  
Swelling Potential ◽  
Additional Advantage ◽  
Release Devices

Grafting polymerization of acrylic acid (AA) was undertaken onto cellulose powder (Cell) in presence of potassium fulvate (KF) to produce semi-interpenetrating network structures. The grafting efficiency (GE) and grafting yield (GY) were studied as and indicated that the grafting process was not influenced in presence of KF. KF was expected to be incorporated into the cellulose backbone in the same course of the graft polymerization via polycondensation with groups from cellulose and monomer. The simultaneous graft polymerization of acrylic acid and polycondensation processes of all components allows formation of a more chemically active semi-interpenetrating network structure. Successful incorporation of KF to the network structure was predicted from fourier transform infrared spectroscopy (FTIR) while enhanced Cu2+ uptake confirmed the better chemical activity with respect to the same network prepared in absence of KF. Furthermore, the wide variation of the swelling potential as a function of the pH further corroborates the insertion of KF to the network structure. Imaging with scanning electron microscopy (SEM) indicated morphological alteration on the surface which might be related to the KF anchoring to the cellulose backbone. The developed superabsorbents showed increment in the water absorption both in distilled water and salted solutions as well. The newly developed superabsorbent was applied as a support for soil nutrients and their controlled release in soil was studied. The results proved efficiency of the superabsorbent to warrant appropriate release of the nutrients according to the time regulations set by European Committee of Normalization (ECN). Improved water retention was also an additional advantage.

scholarly journals Development of Hydrogen-Permselective Porous Membranes Using Radiation-Induced Graft Polymerization

2020 ◽  
Vol 4 (2) ◽  
pp. 23 ◽  
Author(s):  
Shin Hasegawa ◽  
Shinichi Sawada ◽  
Shinya Azami ◽  
Tokio Hagiwara ◽  
Akihiro Hiroki ◽  
...  
Keyword(s):  
Water Vapor ◽  
Acrylic Acid ◽  
Polyvinylidene Fluoride ◽  
Graft Polymerization ◽  
Hydrogen Permeability ◽  
Porous Membranes ◽  
Hot Press ◽  
Radiation Induced ◽  
Permeability For Water ◽  
Radiation Induced Grafting

Hydrogen-permselective membranes were developed using a radiation-induced grafting method. Styrene (St) and acrylic acid (AAc) monomers were introduced into porous polyvinylidene fluoride (PVDF) membranes to obtain St- and AAc-grafted PVDF membranes with grafting degrees of 82% and 92%, respectively. The porosities of the grafted membranes were controlled in the range 30–40% by hot-press compression at 159 °C and 4 MPa. The hydrogen permeability was found to be of the order of 10−7 mol/m2∙s∙Pa, which was higher than the permeability for water vapor and nitrogen (oxygen model). The St- and AAc-grafted membranes exhibited 9.0 and 34 times higher permeability for H2 than for H2O and N2, respectively.

The preparation of hydrogel-like polyurethane using the graft polymerization of N,N-dimethylaminoethyl methacrylate and acrylic acid

2019 ◽  
Vol 76 (12) ◽  
pp. 6371-6386 ◽  
Author(s):  
Yong-Chan Chung ◽  
Jin Cheol Bae ◽  
Jae Won Choi ◽  
Byoung Chul Chun
Keyword(s):  
Acrylic Acid ◽  
Graft Polymerization ◽  
Dimethylaminoethyl Methacrylate

Optimization of UV-Induced Graft Polymerization of Acrylic Acid on Polypropylene Films Using CdS as Light Sensor

2018 ◽  
Vol 57 (4) ◽  
pp. 1188-1196 ◽  
Author(s):  
María Fernanda Stragliotto ◽  
Miriam C. Strumia ◽  
Cesar G. Gomez ◽  
Marcelo R. Romero
Keyword(s):  
Acrylic Acid ◽  
Graft Polymerization ◽  
Light Sensor ◽  
Polypropylene Films
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