Relationship between water absorbency and reaction conditions in aqueous solution polymerization of polyacrylate superabsorbents

2000 ◽  
Vol 75 (6) ◽  
pp. 808-814 ◽  
Author(s):  
Junwu Chen ◽  
Yaoming Zhao
Keyword(s):  
Aqueous Solution ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Reaction Conditions ◽  
Aqueous Solution Polymerization

Properties and Synthesis of Kaolin / Potassium Polyacrylate / Acrylamide Composite Superabsorbent Resin

2011 ◽  
Vol 287-290 ◽  
pp. 1331-1334
Author(s):  
Hao Ren ◽  
Jie Li ◽  
Yu Fen Zhang ◽  
Tai Zhong Huang
Keyword(s):  
Aqueous Solution ◽  
Saline Water ◽  
Monomer Concentration ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Synthetic Resin ◽  
Polymer Molecules ◽  
Aqueous Solution Polymerization ◽  
Crosslinker Concentration ◽  
Superabsorbent Resin

The aqueous solution polymerization methods were used for the synthesis of superabsorbent resin. The effects of different experimental factors on synthetic resin water absorbency were investigated in this paper. The variables examined in this study included monomer concentration, neutralization degree, initiator and crosslinker concentration, reaction temperature and time, etc. The maximum absorbencies of distilled and 0.9% saline water are 919 times and 92 times respectively under optimum condition. Analysis from FTIR and SEM shown the polymer molecules can be firmly fixed with kaolin, the bonding of kaolin and polymer is good in CSR.

Glutaraldehyde-Cross-Linked Poly(acrylic acid-co-acrylamide)/Poly(vinyl alcohol) Superabsorbent Membranes

2014 ◽  
Vol 789 ◽  
pp. 194-200
Author(s):  
Man Yi Wang ◽  
Yan Ping Wang ◽  
Yan Ting Yu ◽  
Yi Min Wang ◽  
Jian Hua Ni
Keyword(s):  
Heat Treatment ◽  
Aqueous Solution ◽  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Treatment Conditions ◽  
Aqueous Solution Polymerization ◽  
Cross Linker

The superabsorbent membranes were prepared with acrylic acid (AA) and acrylamide (AM) as the monomers, poly (vinyl alcohol) (PVA) as toughening components, potassium persulfate (KPS) as the initiator agent, and glutaraldehyde (GA) as cross-linker by means of aqueous solution polymerization. Their structures were analyzed by FTIR spectroscopy. The effects of synthesis and heat-treatment conditions on water absorbency of superabsorbent membranes were investigated. Their water absorbency with different pH was studied as well. The results showed that the superabsorbent membranes exhibited intelligently pH-responsiveness.

Preparation and Water Absorbency of Superabsorbent Kaolin/PAA-AM Composite

2013 ◽  
Vol 634-638 ◽  
pp. 1968-1976 ◽  
Author(s):  
Shi Han Shen ◽  
Yu Yu Zhang ◽  
Tian Bin Li ◽  
Qing Le Zeng
Keyword(s):  
Composite Material ◽  
Complex Structure ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Mass Ratio ◽  
Reaction Conditions ◽  
Superabsorbent Composite ◽  
Optimum Reaction ◽  
The Fourier Transform ◽  
Composite Variables

In this paper, a novel superabsorbent composite material based on acrylic acid (AA), acrylic amide (AM) and inorganic kaolin was synthesized via solution polymerization in aqueous medium with N,N’-methylene bisacrylamide (MBA) as crosslinker and potassium persulfate (KPS) as initiator. The effects of water absorbency of the composite variables, such as neutralization, kaolin concentration and MBA concentration, on the water absorbency were systematically optimized. Evidence of compositing was obtained by a comparison of the Fourier transform infrared spectra of the initial reactants with that of the superabsorbent composites, and its complex structure was confirmed with scanning electron microscope. The water absorbing mechanism was also discussed. The results indicated that the superabsorbent composite material was successfully synthesized and the optimum reaction conditions were as follows: the neutralization degree was 80%, the dosage of kaolin, crosslinker and initiator were 4%, 0.11%, and 0.9% respectively and the mass ratio of AA and AM was 3∶2. The optimum absorbency of the superabsorbent composite material in distilled water could reach 815.6g/g.

Semibatch Aqueous-Solution Polymerization of Acrylic Acid: Simultaneous Control of Molar Masses and Reaction Temperature

2011 ◽  
Vol 5 (5-6) ◽  
pp. 223-231 ◽  
Author(s):  
Roque J. Minari ◽  
Gerardo Caceres ◽  
Paola Mandelli ◽  
Mariana M. Yossen ◽  
Manuel Gonzalez-Sierra ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Reaction Temperature ◽  
Solution Polymerization ◽  
Simultaneous Control ◽  
Aqueous Solution Polymerization

Preparation of TiO2/Polyacrylic Acid and Application in Photocatalytic Degradation of Methyl Orange

2009 ◽  
Vol 17 (4) ◽  
pp. 195-203
Author(s):  
Shanxia Luo ◽  
Hui Zhu ◽  
Fumin Wang ◽  
Feng Xin ◽  
Xiaohong Yin
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Organic Compound ◽  
Polyacrylic Acid ◽  
Fine Particles ◽  
Absorption Characteristic ◽  
Solution Polymerization ◽  
Good Activity ◽  
Aqueous Solution Polymerization ◽  
Degradation Of Methyl Orange

TiO2 (P25) fine particles were loaded in a polyacrylic acid (PAA), which possessed a unique absorption characteristic and was synthesised by aqueous solution polymerization. The TiO2/PAA composite was taken as a photocatalyst to degrade methyl orange (MO), the degradability resistance and reproducibility of the photocatalyst were investigated experimentally. The results showed that the TiO2/PAA photocatalyst had a good activity and stability in degradability of organic compound.

A Novel Cement Fluid Loss Additive P1402

2014 ◽  
Vol 941-944 ◽  
pp. 1203-1207 ◽  
Author(s):  
Qiang Xiao ◽  
Wen Fa Xiao ◽  
Xin Xin Liu
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
High Temperature ◽  
Reaction Time ◽  
Performance Testing ◽  
Fluid Loss ◽  
Solution Polymerization ◽  
Excellent Thermal Stability ◽  
Aqueous Solution Polymerization ◽  
Fluid Loss Additive

A novel cement fluid loss additive P1402, which synthesized using the monomers of 2-acrylamido-2-methyl-propane sulphonic acid (AMPS), acrylic acid (AA), N,N dimethyl acrylamide (DMAM) and N-Vinyl-2-pyrrolidone (NVP) by the method of aqueous solution polymerization. The ratio of monomers AMPS:AA:DMAM:NVP at 2:1.5:1:1, reaction PH at 10.8, reaction temperature at 65°Cand reaction time about 5 hours. The IR spectrum of P1402 show that the polymer with the structure of all the monomers .The fluid loss performance testing show that the forpolymers P1402 has an excellent thermal stability. The fluid loss additive P1402 has an excellent tolerance to salt and high temperature.

Synthesis and Application of Starch Modified Flocculant

2013 ◽  
Vol 821-822 ◽  
pp. 1014-1018
Author(s):  
Meng Zheng ◽  
Hong Jun Zhang
Keyword(s):  
Raw Material ◽  
Solution Polymerization ◽  
Optimum Conditions ◽  
Cationic Starch ◽  
Reaction Conditions ◽  
Treatment Performance ◽  
Methylation Reaction ◽  
Aqueous Solution Polymerization ◽  
Optimum Reaction ◽  
Oil Wastewater

Starch (St) and acrylamide (AM) copolymers was prepared by aqueous solution polymerization, which as raw material finished hydroxyl methylation reaction, then condensation dehydration with dicyanodiamine, cationic starch graft flocculant is synthetized. Hydroxyl methylation reaction optimum conditions are: temperature T=50°C; pH=10; n (HCHO) : n (St-AM)=1.1:1; reaction time t=2h; Dehydration optimum reaction conditions: mole ratio of 1:1; pH = 4; t=3 h; temperature T=45°C. Intrinsic viscosity number of product is 1023 ml/g, cationizing degree is 50%. Treatment performance for oil wastewater is investigated by using cationic starch graft flocculant compound with the inorganic polymeric coagulant polyferric chloride, the experimental results show that: in wastewater pH=7, the amount of inorganic polymeric coagulant polyferric chloride is 2000 mg/L, the amount of starch graft flocculant is 500 mg/L, the treatment effect is the best, oil content and suspension content are less than 10 mg/L, which reach Daqing oilfield re-injection standard.

Study on the Preparation and Properties of PAA/BC/Na-MMT Composites

2011 ◽  
Vol 236-238 ◽  
pp. 1766-1769
Author(s):  
Hui Ling Shen ◽  
Li Juan Long ◽  
Shi Ru Jia
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Network Structure ◽  
Layered Structure ◽  
Polyacrylic Acid ◽  
Sem Analysis ◽  
Solution Polymerization ◽  
Aqueous Solution Polymerization ◽  
Polymerization Method ◽  
Thermal Stability Of

By means of aqueous solution polymerization method, the composites of polyacrylic acid (PAA)/Bacterial cellulose (BC)/Na-MMT and PAA/Na-MMT were prepared respectively. The effects of Na-MMT content on the properties of PAA/Na-MMT and BC content on the properties of PAA/BC/Na-MMT composites were investigated. The results show that with appropriate increasing Na-MMT, the composites has good salt-resistant ability and thermal stability, mean while, the water-absorbing capacity of PAA/Na-MMT composites is significantly increased. Comparing with that of the PAA/Na-MMT hydrogel, with addition of BC content, the water-absorbing capacity and thermal stability of PAA/BC/Na-MMT are enhanced in a certain degree. The SEM analysis indicate that there are more network structure in the composites hydrogel. XRD result shows that the layered structure of Na-MMT is stripped and the prepared composites achieves peel compound.

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